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Vilardi KJ, Johnston J, Dai Z, Cotto I, Tuttle E, Patterson A, Stubbins A, Pieper KJ, Pinto AJ. Nitrogen source influences the interactions of comammox bacteria with aerobic nitrifiers. Microbiol Spectr 2024; 12:e0318123. [PMID: 38511951 PMCID: PMC11064514 DOI: 10.1128/spectrum.03181-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 02/29/2024] [Indexed: 03/22/2024] Open
Abstract
While the co-existence of comammox Nitrospira with canonical nitrifiers is well documented in diverse ecosystems, there is still a dearth of knowledge about the mechanisms underpinning their interactions. Understanding these interaction mechanisms is important as they may play a critical role in governing nitrogen biotransformation in natural and engineered ecosystems. In this study, we tested the ability of two environmentally relevant factors (nitrogen source and availability) to shape interactions between strict ammonia and nitrite-oxidizing bacteria and comammox Nitrospira in continuous flow column reactors. The composition of inorganic nitrogen species in reactors fed either ammonia or urea was similar during the lowest input nitrogen concentration (1 mg-N/L), but higher concentrations (2 and 4 mg-N/L) promoted significant differences in nitrogen species composition and nitrifier abundances. The abundance and diversity of comammox Nitrospira were dependent on both nitrogen source and input concentrations as multiple comammox Nitrospira populations were preferentially enriched in the urea-fed system. In contrast, their abundance was reduced in response to higher nitrogen concentrations in the ammonia-fed system. The preferential enrichment of comammox Nitrospira in the urea-fed system could be associated with their ureolytic activity calibrated to their ammonia oxidation rates, thus minimizing ammonia accumulation, which may be partially inhibitory. However, an increased abundance of comammox Nitrospira was not associated with a reduced abundance of nitrite oxidizers in the urea-fed system while a negative correlation was found between them in the ammonia-fed system, the latter dynamic likely emerging from reduced availability of nitrite to strict nitrite oxidizers at low ammonia concentrations. IMPORTANCE Nitrification is an essential biological process in drinking water and wastewater treatment systems for treating nitrogen pollution. The discovery of comammox Nitrospira and their detection alongside canonical nitrifiers in these engineered ecosystems have made it necessary to understand the environmental conditions that regulate their abundance and activity relative to other better-studied nitrifiers. This study aimed to evaluate two important factors that could potentially influence the behavior of nitrifying bacteria and, therefore, impact nitrification processes. Column reactors fed with either ammonia or urea were systematically monitored to capture changes in nitrogen biotransformation and the nitrifying community as a function of influent nitrogen concentration, nitrogen source, and reactor depth. Our findings show that with increased ammonia availability, comammox Nitrospira decreased in abundance while nitrite oxidizers abundance increased. Yet, in systems with increasing urea availability, comammox Nitrospira abundance and diversity increased without an associated reduction in the abundance of canonical nitrifiers.
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Affiliation(s)
- Katherine Jeanne Vilardi
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA
| | - Juliet Johnston
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Zihan Dai
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Irmarie Cotto
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Erin Tuttle
- Department of Marine and Environmental Sciences, Northeastern University, Boston, Massachusetts, USA
| | - Ariana Patterson
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA
| | - Aron Stubbins
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA
- Department of Marine and Environmental Sciences, Northeastern University, Boston, Massachusetts, USA
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts, USA
| | - Kelsey J. Pieper
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA
| | - Ameet J. Pinto
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
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2
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Tuttle E, Wiman C, Muñoz S, Law KL, Stubbins A. Sunlight-Driven Photochemical Removal of Polypropylene Microplastics from Surface Waters Follows Linear Kinetics and Does Not Result in Fragmentation. Environ Sci Technol 2024; 58:5461-5471. [PMID: 38489752 DOI: 10.1021/acs.est.3c07161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
Floating microplastics are susceptible to sunlight-driven photodegradation, which can convert plastic carbon to dissolved organic carbon (DOC) and can facilitate microplastic fragmentation by mechanical forces. To understand the photochemical fate of sub-millimeter buoyant plastics, ∼0.6 mm polypropylene microplastics were photodegraded while tracking plastic mass, carbon, and particle size distributions. Plastic mass loss and carbon loss followed linear kinetics. At most time points DOC accumulation accounted for under 50% of the total plastic carbon lost. DOC accumulation followed sigmoidal kinetics, not the exponential kinetics previously reported for shorter irradiations. Thus, we suggest that estimates of plastic lifespan based on exponential DOC accumulation are inaccurate. Instead, linear plastic-C mass and plastic mass loss kinetics should be used, and these methods result in longer estimates of photochemical lifetimes for plastics in surface waters. Scanning electron microscopy revealed that photoirradiation produced two distinct patterns of cracking on the particles. However, size distribution analyses indicated that fragmentation was minimal. Instead, the initial population of microplastics shrank in size during irradiations, indicating photoirradiation in tranquil waters (i.e., without mechanical forcing) dissolved sub-millimeter plastics without fragmentation.
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Affiliation(s)
- Erin Tuttle
- Department of Biological and Physical Sciences, Assumption University, Worcester, Massachusetts 01609, United States
| | - Charlotte Wiman
- Department of Marine and Environmental Science, Northeastern University, Boston, Massachusetts 02115, United States
| | - Samuel Muñoz
- Department of Marine and Environmental Science, Northeastern University, Boston, Massachusetts 02115, United States
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Kara Lavender Law
- Sea Education Association, Woods Hole, Massachusetts 02540, United States
| | - Aron Stubbins
- Department of Marine and Environmental Science, Northeastern University, Boston, Massachusetts 02115, United States
- Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts 02115, United States
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States
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3
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Stubbins A, Zhu L, Zhao S, Spencer RGM, Podgorski DC. Molecular Signatures of Dissolved Organic Matter Generated from the Photodissolution of Microplastics in Sunlit Seawater. Environ Sci Technol 2023; 57:20097-20106. [PMID: 37955971 DOI: 10.1021/acs.est.1c03592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Plastics are accumulating on Earth, including at sea. The photodegradation of microplastics floating in seawater produces dissolved organic matter (DOM), indicating that sunlight can photodissolve microplastics at the sea surface. To characterize the chemistry of DOM produced as microplastics photodissolve, three microplastics that occur in surface waters, polyethylene (PE), polypropylene (PP), and expanded polystyrene (EPS), were incubated floating on seawater in both the light and the dark. We present the molecular signatures of the DOM produced during these incubations, as determined via ultrahigh-resolution mass spectrometry. Zero to 12 products were identified in the dark, whereas 319-705 photoproducts were identified in the light. Photoproduced DOM included oxygen atoms, indicating that soluble, oxygen-containing organics were formed as plastics photodegrade. PP and PE plastics have hydrogen-to-carbon (H/C) ratios of 2 and generated DOM with average H/C values of 1.7 ± 0.1 to 1.8 ± 0.1, whereas EPS, which has an H/C of 1, generated DOM with an average H/C of 0.9 ± 0.2, indicating the stoichiometry of photoproduced DOM was related to the stoichiometry of the photodegrading polymer. The photodissolution of plastics produced hundreds of photoproducts with varying elemental stoichiometries, indicating that a single abiotic process (photochemistry) can generate hundreds of different chemicals from stoichiometrically monotonous polymers.
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Affiliation(s)
- Aron Stubbins
- Department of Marine and Environmental Sciences, Northeastern University, Hurtig 102, Boston, Massachusetts 02115, United States
- Departments of Civil and Environmental Engineering, and Chemistry and Chemical Biology, Northeastern University, Hurtig 102, Boston, Massachusetts 02115, United States
| | - Lixin Zhu
- Department of Marine and Environmental Sciences, Northeastern University, Hurtig 102, Boston, Massachusetts 02115, United States
| | - Shiye Zhao
- Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan
| | - Robert G M Spencer
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United States
| | - David C Podgorski
- Pontchartrain Institute for Environmental Sciences, Department of Chemistry, Chemical Analysis & Mass Spectrometry Facility, University of New Orleans, New Orleans, Louisiana 70148, United States
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4
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Li C, Yan F, Kang S, Yan C, Hu Z, Chen P, Gao S, Zhang C, He C, Kaspari S, Stubbins A. Corrigendum to "Carbonaceous matter in the atmosphere and glaciers of the Himalayas and the Tibetan plateau: An investigative review" [Environ. Int. 146 (2021) 106281]. Environ Int 2023; 179:108133. [PMID: 37640564 DOI: 10.1016/j.envint.2023.108133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Affiliation(s)
- Chaoliu Li
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China.
| | - Fangping Yan
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; UT School of Engineering Science, Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland
| | - Shichang Kang
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Caiqing Yan
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Zhaofu Hu
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Pengfei Chen
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shaopeng Gao
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Chao Zhang
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cenlin He
- Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, USA
| | - Susan Kaspari
- Department of Geological Sciences, Central Washington University, Ellensburg, WA 98926, USA
| | - Aron Stubbins
- Departments of Marine and Environmental Science, Chemistry and Chemical Biology, and Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
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5
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Van Stan JT, Allen ST, Aubrey DP, Berry ZC, Biddick M, Coenders-Gerrits MAMJ, Giordani P, Gotsch SG, Gutmann ED, Kuzyakov Y, Magyar D, Mella VSA, Mueller KE, Ponette-González AG, Porada P, Rosenfeld CE, Simmons J, Sridhar KR, Stubbins A, Swanson T. Shower thoughts: why scientists should spend more time in the rain. Bioscience 2023; 73:441-452. [PMID: 37397836 PMCID: PMC10308363 DOI: 10.1093/biosci/biad044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 04/17/2023] [Accepted: 04/26/2023] [Indexed: 07/04/2023] Open
Abstract
Stormwater is a vital resource and dynamic driver of terrestrial ecosystem processes. However, processes controlling interactions during and shortly after storms are often poorly seen and poorly sensed when direct observations are substituted with technological ones. We discuss how human observations complement technological ones and the benefits of scientists spending more time in the storm. Human observation can reveal ephemeral storm-related phenomena such as biogeochemical hot moments, organismal responses, and sedimentary processes that can then be explored in greater resolution using sensors and virtual experiments. Storm-related phenomena trigger lasting, oversized impacts on hydrologic and biogeochemical processes, organismal traits or functions, and ecosystem services at all scales. We provide examples of phenomena in forests, across disciplines and scales, that have been overlooked in past research to inspire mindful, holistic observation of ecosystems during storms. We conclude that technological observations alone are insufficient to trace the process complexity and unpredictability of fleeting biogeochemical or ecological events without the shower thoughts produced by scientists' human sensory and cognitive systems during storms.
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Affiliation(s)
| | - Scott T Allen
- Department of Natural Resources and Environmental Science at the University of Nevada-Reno, Reno, Nevada, United States
| | - Douglas P Aubrey
- Savannah River Ecology Lab and with the Warnell School of Forestry at the University of Georgia, Athens, Georgia, United States
| | - Z Carter Berry
- Department of Biology at Wake Forest University, Winston-Salem, North Carolina, United States
| | - Matthew Biddick
- Terrestrial Ecology Research Group at the Technical University of Munich, Freising, Germany
| | | | - Paolo Giordani
- Dipartimento di Farmacia at the University of Genoa, Genoa, Italy
| | - Sybil G Gotsch
- Department of Forestry and Natural Resources at the University of Kentucky, Lexington, Kentucky, United States
| | - Ethan D Gutmann
- Research Applications Laboratory, at the National Center for Atmospheric Research, Boulder, Colorado, United States
| | - Yakov Kuzyakov
- Department of Soil Science of Temperate Systems, Agricultural Soil Science, at Georg-August-Universität, Göttingen, Germany
- Peoples Friendship University of Russia, Moscow, Russia
| | - Donát Magyar
- National Public Health Center, Budapest, Hungary
| | - Valentina S A Mella
- Sydney School of Veterinary Science, at the University of Sydney, Sydney, New South Wales, Australia
| | - Kevin E Mueller
- Department of Biological, Geological, and Environmental Sciences at Cleveland State University, Cleveland, Ohio, United States
| | - Alexandra G Ponette-González
- Department of City and Metropolitan Planning and with the Natural History Museum of Utah at the University of Utah, Salt Lake City, Utah, United States
| | - Philipp Porada
- Department of Biology at Universität Hamburg, Hamburg, Germany
| | - Carla E Rosenfeld
- Department of Minerals and Earth Sciences at the Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, United States
| | - Jack Simmons
- Department of Philosophy and Religious Studies at Georgia Southern University, Statesboro, Georgia, United States
| | - Kandikere R Sridhar
- Department of Biosciences at Mangalore University, Konaje, Mangaluru, Karnataka, India
| | - Aron Stubbins
- Departments of Marine and Environmental Science, Civil and Environmental Engineering, and Chemistry and Chemical Biology at Northeastern University, Boston, Massachusetts, United States
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6
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Tuttle E, Stubbins A. An optimized acidic digestion for the isolation of microplastics from biota-rich samples and cellulose acetate matrices. Environ Pollut 2023; 322:121198. [PMID: 36736813 DOI: 10.1016/j.envpol.2023.121198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/13/2023] [Accepted: 01/31/2023] [Indexed: 06/18/2023]
Abstract
Plastic pollution is a growing concern. To analyze plastics in environmental samples, plastics need to be isolated. We present an acidic/oxidative method optimized to preserve plastics while digesting synthetic cellulose acetate and a range of organics encountered in environmental samples. Cellulose acetate was chosen for optimization as it can be purchased as a reference material, can co-occur with plastics in environmental samples and, if it can be completely digested, is a potential filter material for the collection of nano- and micro-plastics from natural waters. Other forms of particulate organic matter (POM) were chosen to provide a range of chemistries that might alter digestion efficiency and due to the interest in the community of isolating plastics from samples where these organics occur. For instance, microalgal POM occurs in lake and ocean waters, riverine POM in rivers, and inclusion of tuna provides a test for the suitability of the method for isolating plastics from animal tissues. The method is a one-pot overnight (16-18 h) digestion in 5 M nitric acid with 0.3 M sodium persulfate heated to 80 °C. The method provides quantitative removal of cellulose acetate (exceeding detection limits), near quantitative removal of microalgal POM and Albacore tuna tissue (>99%), but only 86% of urban river POM, all while retaining >99% by mass of C-C bonded polymers polyethylene, polypropylene, and polystyrene and >96% by mass of polyethylene terephthalate. Fourier transform infrared spectroscopy (FT-IR) and %-C content analysis confirmed plastic polymer stability during digestion. However, some additives in appear susceptible to digestion with FT-IR results indicating the loss of N,N'-ethylenebis(stearamide) from polyethylene. This method provides a simpler and more effective method than many in the literature. We present recommendations for the application of this method, as well as limitations and areas for future improvement.
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Affiliation(s)
- Erin Tuttle
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, USA.
| | - Aron Stubbins
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, USA; Department of Marine and Environmental Science, Northeastern University, Boston, MA, USA; Department of Civil and Environmental Engineering, Northeastern University, Boston, MA, USA
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7
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Vosloo S, Huo L, Chauhan U, Cotto I, Gincley B, Vilardi KJ, Yoon B, Bian K, Gabrielli M, Pieper KJ, Stubbins A, Pinto AJ. Gradual Recovery of Building Plumbing-Associated Microbial Communities after Extended Periods of Altered Water Demand during the COVID-19 Pandemic. Environ Sci Technol 2023; 57:3248-3259. [PMID: 36795589 PMCID: PMC9969676 DOI: 10.1021/acs.est.2c07333] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 02/06/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
COVID-19 pandemic-related building restrictions heightened drinking water microbiological safety concerns post-reopening due to the unprecedented nature of commercial building closures. Starting with phased reopening (i.e., June 2020), we sampled drinking water for 6 months from three commercial buildings with reduced water usage and four occupied residential households. Samples were analyzed using flow cytometry and full-length 16S rRNA gene sequencing along with comprehensive water chemistry characterization. Prolonged building closures resulted in 10-fold higher microbial cell counts in the commercial buildings [(2.95 ± 3.67) × 105 cells mL-1] than in residential households [(1.11 ± 0.58) × 104 cells mL-1] with majority intact cells. While flushing reduced cell counts and increased disinfection residuals, microbial communities in commercial buildings remained distinct from those in residential households on the basis of flow cytometric fingerprinting [Bray-Curtis dissimilarity (dBC) = 0.33 ± 0.07] and 16S rRNA gene sequencing (dBC = 0.72 ± 0.20). An increase in water demand post-reopening resulted in gradual convergence in microbial communities in water samples collected from commercial buildings and residential households. Overall, we find that the gradual recovery of water demand played a key role in the recovery of building plumbing-associated microbial communities as compared to short-term flushing after extended periods of reduced water demand.
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Affiliation(s)
- Solize Vosloo
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Linxuan Huo
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30318, United States
| | - Umang Chauhan
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Irmarie Cotto
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Benjamin Gincley
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30318, United States
| | - Katherine J. Vilardi
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Bryan Yoon
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Kaiqin Bian
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30318, United States
| | - Marco Gabrielli
- Dipartimento
di Ingegneria Civile e Ambientale - Sezione Ambientale, Politecnico di Milano, 20133 Milan, Italy
| | - Kelsey J. Pieper
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Aron Stubbins
- Department
of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 021115, United States
| | - Ameet J. Pinto
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30318, United States
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8
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Ryan KA, Palacios LC, Encina F, Graeber D, Osorio S, Stubbins A, Woelfl S, Nimptsch J. Assessing inputs of aquaculture-derived nutrients to streams using dissolved organic matter fluorescence. Sci Total Environ 2022; 807:150785. [PMID: 34653451 DOI: 10.1016/j.scitotenv.2021.150785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 09/10/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Salmon aquaculture is an important economic activity globally where local freshwater supplies permit land-based salmon aquaculture facilities to cultivate early life stage salmon. Nitrogen, phosphorus and organic matter in aquaculture effluents contribute to the eutrophication of adjacent and downstream rivers and lakes. This study quantifies the enrichment of nutrients in land-based salmon aquaculture facility effluents compared to receiving waters. We measured nutrient concentrations and dissolved organic matter (DOM) quantity and quality via fluorescence spectroscopy in streams and effluent waters associated with 27 facilities in Chile. We found that facilities added on average 0.9 (s.d. = 2.0) mg-C L-1, 542 (s.d. = 637) μg-total N L-1, and 104 (s.d. = 104) μg-total P L-1 to effluents compared to stream waters. DOM in stream water was enriched in humic-like fluorescence, while aquaculture effluents were enriched in protein-like DOM fluorophores. Principal component and correlation analysis revealed that tryptophan-like fluorescence was a good predictor of total N and P in effluents, but the strength of significant linear relationships varied among individual facilities (r2: 0.2 to 0.9). Agreement between laboratory fluorescence and a portable fluorometer indicates the utility of in-situ sensors for monitoring of both tryptophan-like fluorescence and covarying nutrients in effluents. Thus, continuous in-situ sensors are likely to improve industry management and allow more robust estimates of aquaculture-derived nutrients delivered to receiving waters.
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Affiliation(s)
- Kevin A Ryan
- Department of Marine and Environmental Sciences, Northeastern University, Boston, MA 02115, USA
| | | | | | - Daniel Graeber
- Helmholtz Centre for Environmental Research GmbH - UFZ, Germany
| | - Sebastian Osorio
- Instituto de Ciencias Marinas y Limnologicas, Universidad Austral de Chile, Chile
| | - Aron Stubbins
- Department of Marine and Environmental Sciences, Northeastern University, Boston, MA 02115, USA; Department of Chemistry and Chemical Biology, Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
| | - Stefan Woelfl
- Instituto de Ciencias Marinas y Limnologicas, Universidad Austral de Chile, Chile
| | - Jorge Nimptsch
- Instituto de Ciencias Marinas y Limnologicas, Universidad Austral de Chile, Chile.
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9
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Wagner S, Coppola AI, Stubbins A, Dittmar T, Niggemann J, Drake TW, Seidel M, Spencer RGM, Bao H. Questions remain about the biolability of dissolved black carbon along the combustion continuum. Nat Commun 2021; 12:4281. [PMID: 34257297 PMCID: PMC8277834 DOI: 10.1038/s41467-021-24477-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 06/14/2021] [Indexed: 11/09/2022] Open
Affiliation(s)
- Sasha Wagner
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York, NY, USA.
| | - Alysha I Coppola
- Geological Institute, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland
| | - Aron Stubbins
- Department of Marine and Environmental Sciences, Civil and Environmental Engineering, and Chemistry and Chemical Biology, Northeastern University, Boston, MA, USA
| | - Thorsten Dittmar
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany
- Helmholtz Institute for Functional Marine Biodiversity (HIFMB) at the University of Oldenburg, Oldenburg, Germany
| | - Jutta Niggemann
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany
| | - Travis W Drake
- Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
| | - Michael Seidel
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany
| | - Robert G M Spencer
- Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, USA
| | - Hongyan Bao
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
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10
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Abstract
Plastic contamination of the environment is a global problem whose magnitude justifies the consideration of plastics as emergent geomaterials with chemistries not previously seen in Earth's history. At the elemental level, plastics are predominantly carbon. The comparison of plastic stocks and fluxes to those of carbon reveals that the quantities of plastics present in some ecosystems rival the quantity of natural organic carbon and suggests that geochemists should now consider plastics in their analyses. Acknowledging plastics as geomaterials and adopting geochemical insights and methods can expedite our understanding of plastics in the Earth system. Plastics also can be used as global-scale tracers to advance Earth system science.
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Affiliation(s)
- Aron Stubbins
- Department of Marine and Environmental Sciences and Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA. .,Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
| | | | - Samuel E Muñoz
- Department of Marine and Environmental Sciences and Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
| | - Thomas S Bianchi
- Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA
| | - Lixin Zhu
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
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11
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Podgorski DC, Zito P, Kellerman AM, Bekins BA, Cozzarelli IM, Smith DF, Cao X, Schmidt-Rohr K, Wagner S, Stubbins A, Spencer RGM. Hydrocarbons to carboxyl-rich alicyclic molecules: A continuum model to describe biodegradation of petroleum-derived dissolved organic matter in contaminated groundwater plumes. J Hazard Mater 2021; 402:123998. [PMID: 33254831 DOI: 10.1016/j.jhazmat.2020.123998] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 08/17/2020] [Accepted: 09/13/2020] [Indexed: 06/12/2023]
Abstract
Relationships between dissolved organic matter (DOM) reactivity and chemical composition in a groundwater plume containing petroleum-derived DOM (DOMHC) were examined by quantitative and qualitative measurements to determine the source and chemical composition of the compounds that persist downgradient. Samples were collected from a transect down the core of the plume in the direction of groundwater flow. An exponential decrease in dissolved organic carbon concentration resulting from biodegradation along the transect correlated with a continuous shift in fluorescent DOMHC from shorter to longer wavelengths. Moreover, ultrahigh resolution mass spectrometry showed a shift from low molecular weight (MW) aliphatic, reduced compounds to high MW, unsaturated (alicyclic/aromatic), high oxygen compounds that are consistent with carboxyl-rich alicyclic molecules. The degree of condensed aromaticity increased downgradient, indicating that compounds with larger, conjugated aromatic core structures were less susceptible to biodegradation. Nuclear magnetic resonance spectroscopy showed a decrease in alkyl (particularly methyl) and an increase in aromatic/olefinic structural motifs. Collectively, data obtained from the combination of these complementary analytical techniques indicated that changes in the DOMHC composition of a groundwater plume are gradual, as relatively low molecular weight (MW), reduced, aliphatic compounds from the oil source were selectively degraded and high MW, alicyclic/aromatic, oxidized compounds persisted.
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Affiliation(s)
- David C Podgorski
- Pontchartrain Institute for Environmental Sciences, Department of Chemistry, Chemical Analysis & Mass Spectrometry Facility, University of New Orleans, New Orleans, LA 70148, USA.
| | - Phoebe Zito
- Pontchartrain Institute for Environmental Sciences, Department of Chemistry, Chemical Analysis & Mass Spectrometry Facility, University of New Orleans, New Orleans, LA 70148, USA
| | - Anne M Kellerman
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | | | | | - Donald F Smith
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Xiaoyan Cao
- Department of Chemistry, Brandeis University, Waltham, MA 02453, USA
| | | | - Sasha Wagner
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; Department of Chemistry and Chemical Biology, Department of Marine and Environmental Sciences, Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
| | - Aron Stubbins
- Department of Chemistry and Chemical Biology, Department of Marine and Environmental Sciences, Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
| | - Robert G M Spencer
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
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12
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Li C, Yan F, Kang S, Yan C, Hu Z, Chen P, Gao S, Zhang C, He C, Kaspari S, Stubbins A. Carbonaceous matter in the atmosphere and glaciers of the Himalayas and the Tibetan plateau: An investigative review. Environ Int 2021; 146:106281. [PMID: 33395932 DOI: 10.1016/j.envint.2020.106281] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 11/05/2020] [Accepted: 11/09/2020] [Indexed: 06/12/2023]
Abstract
Carbonaceous matter, including organic carbon (OC) and black carbon (BC), is an important climate forcing agent and contributes to glacier retreat in the Himalayas and the Tibetan Plateau (HTP). The HTP - the so-called "Third Pole" - contains the most extensive glacial area outside of the polar regions. Considerable research on carbonaceous matter in the HTP has been conducted, although this research has been challenging due to the complex terrain and strong spatiotemporal heterogeneity of carbonaceous matter in the HTP. A comprehensive investigation of published atmospheric and snow data for HTP carbonaceous matter concentration, deposition and light absorption is presented, including how these factors vary with time and other parameters. Carbonaceous matter concentrations in the atmosphere and glaciers of the HTP are found to be low. Analysis of water-insoluable organic carbon and BC from snowpits reveals that concentrations of OC and BC in the atmosphere and glacier samples in arid regions of the HTP may be overestimated due to contributions from inorganic carbon in mineral dust. Due to the remote nature of the HTP, carbonaceous matter found in the HTP has generally been transported from outside the HTP (e.g., South Asia), although local HTP emissions may also be important at some sites. This review provides essential data and a synthesis of current thinking for studies on atmospheric transport modeling and radiative forcing of carbonaceous matter in the HTP.
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Affiliation(s)
- Chaoliu Li
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China.
| | - Fangping Yan
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; UT School of Engineering Science, Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland
| | - Shichang Kang
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Caiqing Yan
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Zhaofu Hu
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Pengfei Chen
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shaopeng Gao
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Chao Zhang
- CAS Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cenlin He
- Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, USA
| | - Susan Kaspari
- Department of Geological Sciences, Central Washington University, Ellensburg, WA 98926, USA
| | - Aron Stubbins
- Departments of Marine and Environmental Science, Chemistry and Chemical Biology, and Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA
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13
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Merder J, Freund JA, Feudel U, Hansen CT, Hawkes JA, Jacob B, Klaproth K, Niggemann J, Noriega-Ortega BE, Osterholz H, Rossel PE, Seidel M, Singer G, Stubbins A, Waska H, Dittmar T. ICBM-OCEAN: Processing Ultrahigh-Resolution Mass Spectrometry Data of Complex Molecular Mixtures. Anal Chem 2020; 92:6832-6838. [DOI: 10.1021/acs.analchem.9b05659] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Julian Merder
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Jan A. Freund
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Ulrike Feudel
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Christian T. Hansen
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Jeffrey A. Hawkes
- Department of Chemistry−BMC, Uppsala University, Husargatan 3 (D5), 752 37 Uppsala, Sweden
| | - Benjamin Jacob
- Helmholtz-Centre Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
| | - Katrin Klaproth
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Jutta Niggemann
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Beatriz E. Noriega-Ortega
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany
| | - Helena Osterholz
- Leibniz Institute for Baltic Sea Research Warnemuende, Seestraße 15, 18119 Rostock, Germany
| | - Pamela E. Rossel
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Michael Seidel
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Gabriel Singer
- Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany
| | - Aron Stubbins
- Departments of Marine and Environmental Science, Chemistry and Chemical Biology, and Civil and Environmental Engineering, Northeastern University, 102 HT, Boston, Massachusetts 02115, United States
| | - Hannelore Waska
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Thorsten Dittmar
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
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14
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Zhu L, Zhao S, Bittar TB, Stubbins A, Li D. Photochemical dissolution of buoyant microplastics to dissolved organic carbon: Rates and microbial impacts. J Hazard Mater 2020; 383:121065. [PMID: 31518809 DOI: 10.1016/j.jhazmat.2019.121065] [Citation(s) in RCA: 153] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 08/02/2019] [Accepted: 08/20/2019] [Indexed: 05/14/2023]
Abstract
Trillions of plastic fragments are afloat at sea, yet they represent only 1-2% of the plastics entering the ocean annually. The fate of the missing plastic and its impact on marine life remains largely unknown. To address these unknowns, we irradiated post-consumer microplastics (polyethylene, PE; polypropylene, PP; and expanded polystyrene, EPS), standard PE, and plastic-fragments collected from the surface waters of the North Pacific Gyre under a solar simulator. We report that simulated sunlight can remove plastics from the sea surface. Simulated sunlight also fragmented, oxidized, and altered the color of the irradiated polymers. Dissolved organic carbon (DOC) is identified as a major byproduct of sunlight-driven plastic photodegradation. Rates of removal depended upon polymer chemistry with EPS degrading more rapidly than PP, and PE being the most photo-resistant polymer studied. The DOC released as most plastics photodegraded was readily utilized by marine bacteria. However, one sample of PE microplastics released organics or co-leachates that inhibited microbial growth. Thus, although sunlight may remove plastics from the ocean's surface, leachates formed during plastic photodegradation may have mixed impacts on ocean microbes and the food webs they support.
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Affiliation(s)
- Lixin Zhu
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China.
| | - Shiye Zhao
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida 34946, USA..
| | - Thais B Bittar
- Marine Science Center, Northeastern University, 430 Nahant Rd, Nahant, MA, 01908, USA.
| | - Aron Stubbins
- Departments of Marine and Environmental Sciences, Civil and Environmental Engineering, and Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
| | - Daoji Li
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China.
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15
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Wagner S, Brandes J, Spencer RGM, Ma K, Rosengard SZ, Moura JMS, Stubbins A. Isotopic composition of oceanic dissolved black carbon reveals non-riverine source. Nat Commun 2019; 10:5064. [PMID: 31699996 PMCID: PMC6838092 DOI: 10.1038/s41467-019-13111-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 10/21/2019] [Indexed: 11/21/2022] Open
Abstract
A portion of the charcoal and soot produced during combustion processes on land (e.g., wildfire, burning of fossil fuels) enters aquatic systems as dissolved black carbon (DBC). In terms of mass flux, rivers are the main identified source of DBC to the oceans. Since DBC is believed to be representative of the refractory carbon pool, constraining sources of marine DBC is key to understanding the long-term persistence of carbon in our global oceans. Here, we use compound-specific stable carbon isotopes (δ13C) to reveal that DBC in the oceans is ~6‰ enriched in 13C compared to DBC exported by major rivers. This isotopic discrepancy indicates most riverine DBC is sequestered and/or rapidly degraded before it reaches the open ocean. Thus, we suggest that oceanic DBC does not predominantly originate from rivers and instead may be derived from another source with an isotopic signature similar to that of marine phytoplankton. Rivers are thought to be the largest source of the recalcitrant and abundant black carbon in the ocean. Here, Wagner and colleagues find distinct pools of black carbon between rivers and the open ocean, challenging the long-held assumption that marine black carbon is of terrestrial origin.
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Affiliation(s)
- Sasha Wagner
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, USA.
| | - Jay Brandes
- Department of Marine Sciences, Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, USA
| | - Robert G M Spencer
- Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, USA
| | - Kun Ma
- Department of Marine Sciences, Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, USA
| | - Sarah Z Rosengard
- Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Jose Mauro S Moura
- Center of Interdisciplinary Formation, Federal University of Western Para (UFOPA), Santarem, Para, Brazil
| | - Aron Stubbins
- Departments of Marine and Environmental Sciences, Civil and Environmental Engineering, and Chemistry and Chemical Biology, Northeastern University, Boston, MA, USA
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16
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Gomez-Saez GV, Pohlabeln AM, Stubbins A, Marsay CM, Dittmar T. Photochemical Alteration of Dissolved Organic Sulfur from Sulfidic Porewater. Environ Sci Technol 2017; 51:14144-14154. [PMID: 29136372 DOI: 10.1021/acs.est.7b03713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Sulfidic sediments are a source of dissolved organic sulfur (DOS) to the ocean but the fate of sedimentary DOS in the oxic, sunlit water column is unknown. We hypothesized that photodegradation after discharge from the dark sedimentary environment results in DOS molecular transformation and decomposition. To test this hypothesis, sulfidic porewater from a saltmarsh was exposed to potential abiotic transformations of dissolved organic matter (DOM) in the water column. We quantitatively investigated DOM transformations via elemental analysis and molecularly via ultrahigh-resolution mass spectrometry. Our study indicated that photoreactivity is dependent on DOM elemental composition as DOS molecular formulas were more photolabile than those without sulfur. Prior to solar irradiation, of the 6451 identified molecular formulas in sulfidic porewater, 39% contained sulfur. After 29 days of irradiation, the DOS concentration was depleted from 13 to 1 μM, together with a 9% decrease in the number of DOS molecular formulas. Comparing porewater and oceanic DOS molecular formulas, solar irradiation increased the similarity due to the removal of photolabile DOS formulas not present in the ocean. In conclusion, DOS from sulfidic sediments is preferentially photolabile and solar irradiation can be a potential mechanism controlling the stability and fate of porewater DOS.
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Affiliation(s)
- Gonzalo V Gomez-Saez
- Research Group for Marine Geochemistry (ICBM - MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg , D-26111 Oldenburg, Germany
| | - Anika M Pohlabeln
- Research Group for Marine Geochemistry (ICBM - MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg , D-26111 Oldenburg, Germany
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia , Savannah, Georgia 30602-3636, United States
| | - Chris M Marsay
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia , Savannah, Georgia 30602-3636, United States
| | - Thorsten Dittmar
- Research Group for Marine Geochemistry (ICBM - MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg , D-26111 Oldenburg, Germany
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17
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Qu B, Sillanpää M, Li C, Kang S, Stubbins A, Yan F, Aho KS, Zhou F, Raymond PA. Correction: Aged dissolved organic carbon exported from rivers of the Tibetan Plateau. PLoS One 2017; 12:e0181295. [PMID: 28686701 PMCID: PMC5501648 DOI: 10.1371/journal.pone.0181295] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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18
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Qu B, Sillanpää M, Li C, Kang S, Stubbins A, Yan F, Aho KS, Zhou F, Raymond PA. Aged dissolved organic carbon exported from rivers of the Tibetan Plateau. PLoS One 2017; 12:e0178166. [PMID: 28552976 PMCID: PMC5446113 DOI: 10.1371/journal.pone.0178166] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 05/08/2017] [Indexed: 11/18/2022] Open
Abstract
The role played by river networks in regional and global carbon cycle is receiving increasing attention. Despite the potential of radiocarbon measurements (14C) to elucidate sources and cycling of different riverine carbon pools, there remain large regions such as the climate-sensitive Tibetan Plateau for which no data are available. Here we provide new 14C data on dissolved organic carbon (DOC) from three large Asian rivers (the Yellow, Yangtze and Yarlung Tsangpo Rivers) running on the Tibetan Plateau and present the carbon transportation pattern in rivers of the plateau versus other river system in the world. Despite higher discharge rates during the high flow season, the DOC yield of Tibetan Plateau rivers (0.41 gC m-2 yr-1) was lower than most other rivers due to lower concentrations. Radiocarbon ages of the DOC were older/more depleted (511±294 years before present, yr BP) in the Tibetan rivers than those in Arctic and tropical rivers. A positive correlation between radiocarbon age and permafrost watershed coverage was observed, indicating that 14C-deplted/old carbon is exported from permafrost regions of the Tibetan Plateau during periods of high flow. This is in sharp contrast to permafrost regions of the Arctic which export 14C-enriched carbon during high discharge periods.
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Affiliation(s)
- Bin Qu
- Laboratory of Green Chemistry, Lappeenranta University of Technology, Mikkeli, Finland
| | - Mika Sillanpää
- Laboratory of Green Chemistry, Lappeenranta University of Technology, Mikkeli, Finland
- Department of Civil and Environmental Engineering, Florida International University, Miami, Florida, United States of America
| | - Chaoliu Li
- Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
- * E-mail:
| | - Shichang Kang
- State Key Laboratory of Cryospheric Sciences, Norwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu, China
- CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Science, University of Georgia, Savannah, Georgia, United States of America
| | - Fangping Yan
- Laboratory of Green Chemistry, Lappeenranta University of Technology, Mikkeli, Finland
| | - Kelly Sue Aho
- Yale School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, United States of America
| | - Feng Zhou
- Sino-France Institute of Earth Systems Science, Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, China
| | - Peter A. Raymond
- Yale School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, United States of America
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19
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Dittmar T, Stubbins A, Ito T, Jones DC. Comment on "Dissolved organic sulfur in the ocean: Biogeochemistry of a petagram inventory". Science 2017; 356:813. [PMID: 28546181 DOI: 10.1126/science.aam6039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 04/07/2017] [Indexed: 01/25/2023]
Abstract
Ksionzek et al (Reports, 28 October 2016, p. 456) provide important data describing the distribution of dissolved organic sulfur (DOS) in the Atlantic Ocean. Here, we show that mixing between water masses is sufficient to explain the observed distribution of DOS, concluding that the turnover time of refractory DOS that Ksionzek et al present cannot be deduced from their data.
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Affiliation(s)
- Thorsten Dittmar
- Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany.
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA 31411, USA
| | - Takamitsu Ito
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340, USA
| | - Daniel C Jones
- British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
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20
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Poulin BA, Ryan JN, Nagy KL, Stubbins A, Dittmar T, Orem W, Krabbenhoft DP, Aiken GR. Spatial Dependence of Reduced Sulfur in Everglades Dissolved Organic Matter Controlled by Sulfate Enrichment. Environ Sci Technol 2017; 51:3630-3639. [PMID: 28248098 DOI: 10.1021/acs.est.6b04142] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Sulfate inputs to the Florida Everglades stimulate sulfidic conditions in freshwater wetland sediments that affect ecological and biogeochemical processes. An unexplored implication of sulfate enrichment is alteration of the content and speciation of sulfur in dissolved organic matter (DOM), which influences the reactivity of DOM with trace metals. Here, we describe the vertical and lateral spatial dependence of sulfur chemistry in the hydrophobic organic acid fraction of DOM from unimpacted and sulfate-impacted Everglades wetlands using X-ray absorption spectroscopy and ultrahigh-resolution mass spectrometry. Spatial variation in DOM sulfur content and speciation reflects the degree of sulfate enrichment and resulting sulfide concentrations in sediment pore waters. Sulfur is incorporated into DOM predominantly as highly reduced species in sulfidic pore waters. Sulfur-enriched DOM in sediment pore waters exchanges with overlying surface waters and the sulfur likely undergoes oxidative transformations in the water column. Across all wetland sites and depths, the total sulfur content of DOM correlated with the relative abundance of highly reduced sulfur functionality. The results identify sulfate input as a primary determinant on DOM sulfur chemistry to be considered in the context of wetland restoration and sulfur and trace metal cycling.
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Affiliation(s)
- Brett A Poulin
- U.S. Geological Survey , Boulder, Colorado 80303, United States
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Joseph N Ryan
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Kathryn L Nagy
- Department of Earth and Environmental Sciences, University of Illinois at Chicago , Chicago, Illinois 60607, United States
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Marine Sciences Department, University of Georgia , Savannah, Georgia 31401, United States
| | - Thorsten Dittmar
- Research Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg , Carl-von-Ossietzky-Strasse 9-11, D-26129 Oldenburg, Germany
| | - William Orem
- U.S. Geological Survey , Reston, Virginia 20192, United States
| | | | - George R Aiken
- U.S. Geological Survey , Boulder, Colorado 80303, United States
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21
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Affiliation(s)
- Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA 31411
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22
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Wagner S, Jaffé R, Cawley K, Dittmar T, Stubbins A. Associations Between the Molecular and Optical Properties of Dissolved Organic Matter in the Florida Everglades, a Model Coastal Wetland System. Front Chem 2015; 3:66. [PMID: 26636070 DOI: 10.3389/fchem.2015.00066] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 11/12/2015] [Indexed: 11/13/2022] Open
Abstract
Optical properties are easy-to-measure proxies for dissolved organic matter (DOM) composition, source, and reactivity. However, the molecular signature of DOM associated with such optical parameters remains poorly defined. The Florida coastal Everglades is a subtropical wetland with diverse vegetation (e.g., sawgrass prairies, mangrove forests, seagrass meadows) and DOM sources (e.g., terrestrial, microbial, and marine). As such, the Everglades is an excellent model system from which to draw samples of diverse origin and composition to allow classically-defined optical properties to be linked to molecular properties of the DOM pool. We characterized a suite of seasonally- and spatially-collected DOM samples using optical measurements (EEM-PARAFAC, SUVA254, S275-295, S350-400, SR, FI, freshness index, and HIX) and ultrahigh resolution mass spectrometry (FTICR-MS). Spearman's rank correlations between FTICR-MS signal intensities of individual molecular formulae and optical properties determined which molecular formulae were associated with each PARAFAC component and optical index. The molecular families that tracked with the optical indices were generally in agreement with conventional biogeochemical interpretations. Therefore, although they represent only a small portion of the bulk DOM pool, absorbance, and fluorescence measurements appear to be appropriate proxies for the aquatic cycling of both optically-active and associated optically-inactive DOM in coastal wetlands.
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Affiliation(s)
- Sasha Wagner
- Marine Sciences Department, Skidaway Institute of Oceanography, The University of Georgia Savannah, GA, USA
| | - Rudolf Jaffé
- Southeast Environmental Research Center, Department of Chemistry and Biochemistry, Florida International University Miami, FL, USA
| | - Kaelin Cawley
- Department of Civil, Environmental and Architectural Engineering, Institute of Arctic and Alpine Research, University of Colorado at Boulder Boulder, CO, USA
| | - Thorsten Dittmar
- Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg Oldenburg, Germany
| | - Aron Stubbins
- Marine Sciences Department, Skidaway Institute of Oceanography, The University of Georgia Savannah, GA, USA
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Fellman JB, Hood E, Raymond PA, Stubbins A, Spencer RGM. Spatial Variation in the Origin of Dissolved Organic Carbon in Snow on the Juneau Icefield, Southeast Alaska. Environ Sci Technol 2015; 49:11492-11499. [PMID: 26348607 DOI: 10.1021/acs.est.5b02685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dissolved organic carbon (DOC) plays a fundamental role in the biogeochemistry of glacier ecosystems. However, the specific sources of glacier DOC remain unresolved. To assess the origin and nature of glacier DOC, we collected snow from 10 locations along a transect across the Juneau Icefield, Alaska extending from the coast toward the interior. The Δ(14)C-DOC of snow varied from -743 to -420‰ showing progressive depletion across the Icefield as δ(18)O of water became more depleted (R(2) = 0.56). Older DOC corresponded to lower DOC concentrations in snow (R(2) = 0.31) and a decrease in percent humic-like fluorescence (R(2) = 0.36), indicating an overall decrease in modern DOC across the Icefield. Carbon isotopic signatures ((13)C and (14)C) combined with a three-source mixing model showed that DOC deposited in snow across the Icefield reflects fossil fuel combustion products (43-73%) and to a lesser extent marine (21-41%) and terrestrial sources (1-26%). Our finding that combustion aerosols are a large source of DOC to the glacier ecosystem during the early spring (April-May) together with the pronounced rates of glacier melting in the region suggests that the delivery of relic DOC to the ocean may be increasing and consequently impacting the biogeochemistry of glacial and proglacial ecosystems in unanticipated ways.
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Affiliation(s)
- Jason B Fellman
- Environmental Science Program, University of Alaska Southeast , Juneau, Alaska 99801, United States
| | - Eran Hood
- Environmental Science Program, University of Alaska Southeast , Juneau, Alaska 99801, United States
| | - Peter A Raymond
- School of Forestry and Environmental Sciences, Yale University , New Haven, Connecticut 06511, United States
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia , Savannah, Georgia 31411, United States
| | - Robert G M Spencer
- Department of Earth, Ocean and Atmospheric Science, Florida State University , Tallahassee, Florida 32306, United States
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Tait ZS, Thompson M, Stubbins A. Chemical Fouling Reduction of a Submersible Steel Spectrophotometer in Estuarine Environments Using a Sacrificial Zinc Anode. J Environ Qual 2015; 44:1321-1325. [PMID: 26437114 DOI: 10.2134/jeq2014.11.0484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The availability of in situ spectrophotometers, such as the S::CAN spectro::lyser, has expanded the possibilities for high-frequency water quality data collection. However, biological and chemical fouling can degrade the performance of in situ spectrophotometers, especially in saline environments with rapid flow rates. A complex freshwater washing system has been previously designed to reduce chemical fouling for the S::CAN spectro::lyser spectrophotometer. In the current study, we present a simpler, cheaper alternative: the attachment of a sacrificial zinc anode. Results are presented detailing the S::CAN spectro::lyser performance with and without the addition of the sacrificial anode. Attachment of the zinc anode provided efficient corrosion protection during 2-wk deployments in a highly dynamic (average tidal range, 2.5 m) saline tidal saltmarsh creek at Groves Creek, Skidaway Institute of Oceanography, Savannah, GA.
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Stubbins A, Lapierre JF, Berggren M, Prairie YT, Dittmar T, del Giorgio PA. What's in an EEM? Molecular signatures associated with dissolved organic fluorescence in boreal Canada. Environ Sci Technol 2014; 48:10598-606. [PMID: 25148241 DOI: 10.1021/es502086e] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Dissolved organic matter (DOM) is a master variable in aquatic systems. Modern fluorescence techniques couple measurements of excitation emission matrix (EEM) spectra and parallel factor analysis (PARAFAC) to determine fluorescent DOM (FDOM) components and DOM quality. However, the molecular signatures associated with PARAFAC components are poorly defined. In the current study we characterized river water samples from boreal Québec, Canada, using EEM/PARAFAC analysis and ultrahigh resolution mass spectrometry (FTICR-MS). Spearman's correlation of FTICR-MS peak and PARAFAC component relative intensities determined the molecular families associated with 6 PARAFAC components. Molecular families associated with PARAFAC components numbered from 39 to 572 FTICR-MS derived elemental formulas. Detailed molecular properties for each of the classical humic- and protein-like FDOM components are presented. FTICR-MS formulas assigned to PARAFAC components represented 39% of the total number of formulas identified and 59% of total FTICR-MS peak intensities, and included significant numbers compounds that are highly unlikely to fluoresce. Thus, fluorescence measurements offer insight into the biogeochemical cycling of a large proportion of the DOM pool, including a broad suite of unseen molecules that apparently follow the same gradients as FDOM in the environment.
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Affiliation(s)
- A Stubbins
- Skidaway Institute of Oceanography, Marine Sciences Department, University of Georgia , Savannah, Georgia 31401, United States
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Fellman JB, Hood E, Spencer RGM, Stubbins A, Raymond PA. Watershed Glacier Coverage Influences Dissolved Organic Matter Biogeochemistry in Coastal Watersheds of Southeast Alaska. Ecosystems 2014. [DOI: 10.1007/s10021-014-9777-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jaffe R, Ding Y, Niggemann J, Vahatalo AV, Stubbins A, Spencer RGM, Campbell J, Dittmar T. Global Charcoal Mobilization from Soils via Dissolution and Riverine Transport to the Oceans. Science 2013; 340:345-7. [DOI: 10.1126/science.1231476] [Citation(s) in RCA: 333] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Spencer RGM, Hernes PJ, Ruf R, Baker A, Dyda RY, Stubbins A, Six J. Temporal controls on dissolved organic matter and lignin biogeochemistry in a pristine tropical river, Democratic Republic of Congo. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jg001180] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Spencer RGM, Stubbins A, Hernes PJ, Baker A, Mopper K, Aufdenkampe AK, Dyda RY, Mwamba VL, Mangangu AM, Wabakanghanzi JN, Six J. Photochemical degradation of dissolved organic matter and dissolved lignin phenols from the Congo River. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jg000968] [Citation(s) in RCA: 197] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stubbins A, Hubbard V, Uher G, Law CS, Upstill-Goddard RC, Aiken GR, Mopper K. Relating carbon monoxide photoproduction to dissolved organic matter functionality. Environ Sci Technol 2008; 42:3271-3276. [PMID: 18522105 DOI: 10.1021/es703014q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Aqueous solutions of humic substances (HSs) and pure monomeric aromatics were irradiated to investigate the chemical controls upon carbon monoxide (CO) photoproduction from dissolved organic matter (DOM). HSs were isolated from lakes, rivers, marsh, and ocean. Inclusion of humic, fulvic, hydrophobic organic, and hydrophilic organic acid fractions from these environments provided samples diverse in source and isolation protocol. In spite of these major differences, HS absorption coefficients (a) and photoreactivities (a bleaching and CO production) were strongly dependent upon HS aromaticity (r2 > 0.90; n = 11), implying aromatic moieties are the principal chromophores and photoreactants within HSs, and by extension, DOM. Carbonyl carbon and CO photoproduction were not correlated, implying that carbonyl moieties are not quantitatively important in CO photoproduction. CO photoproduction efficiency of aqueous solutions of monomeric aromatic compounds that are common constituents of organic matter varied with the nature of ring substituents. Specifically, electron donating groups increased, while electron withdrawing groups decreased CO photoproductivity, supporting our conclusion that carbonyl substituents are not quantitatively important in CO photoproduction. Significantly, aromatic CO photoproduction efficiency spanned 3 orders of magnitude, indicating that variations in the CO apparent quantum yields of natural DOM may be related to variations in aromatic DOM substituent group chemistry.
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Affiliation(s)
- Aron Stubbins
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, USA.
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Mopper K, Stubbins A, Ritchie JD, Bialk HM, Hatcher PG. Advanced Instrumental Approaches for Characterization of Marine Dissolved Organic Matter: Extraction Techniques, Mass Spectrometry, and Nuclear Magnetic Resonance Spectroscopy. Chem Rev 2007; 107:419-42. [PMID: 17300139 DOI: 10.1021/cr050359b] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kenneth Mopper
- Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529, USA
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