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Kong Y, Zhi G, Jin W, Zhang Y, Shen Y, Li Z, Sun J, Ren Y. A review of quantification methods for light absorption enhancement of black carbon aerosol. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 924:171539. [PMID: 38462012 DOI: 10.1016/j.scitotenv.2024.171539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 03/12/2024]
Abstract
Black carbon (BC) is a distinct type of carbonaceous aerosol that has a significant impact on the environment, human health, and climate. A non-BC material coating on BC can alter the mixing state of the BC particles, which considerably enhances the mass absorption efficiency of BC by directing more energy toward the BC cores (lensing effect). A lot of methods have been reported for quantifying the enhancement factor (Eabs), with diverse results. However, to the best of our knowledge, a comprehensive review specific to the quantification methods for Eabs has not been systematically performed, which is unfavorable for the evaluation of obtained results and subsequent radiative forcing. In this review, quantification methods are divided into two broad categories, direct and indirect, depending on whether experimental removal of the coating layer from an aged carbonaceous particle is required. The direct methods described include thermal peeling, solvent dissolution, and optical virtual exfoliation, while the indirect methods include intercept-linear regression fitting, minimum R squared, numerical simulation, and empirical value. We summarized the principles, procedures, virtues, and limitations of the major Eabs quantification methods and analyzed the current problems in the determination of Eabs. We pointed out what breakthroughs are needed to improve or innovate Eabs quantification methods, particularly regarding the need to avoid the influence of brown carbon, develop a broadband Eabs quantification scheme, quantify the Eabs values for the emissions of low-efficiency combustions, measure the Eabs of particles in a high-humidity environment, design a real-time monitor of Eabs by a proper combination of mature techniques, and make more use of artificial intelligence for better Eabs quantification. This review deepens the understanding of Eabs quantification methods and benefits the estimation of the contribution of BC to radiative forcing using climate models.
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Affiliation(s)
- Yao Kong
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Guorui Zhi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Wenjing Jin
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Yuzhe Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Yi Shen
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Zhengying Li
- Beijing Municipal Ecological and Environmental Monitoring Center, Beijing 100048, China
| | - Jianzhong Sun
- School of Physical Education, Chizhou University, Chizhou, Anhui 247000, China
| | - Yanjun Ren
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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2
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Chen X, Ye C, Wang Y, Wu Z, Zhu T, Zhang F, Ding X, Shi Z, Zheng Z, Li W. Quantifying evolution of soot mixing state from transboundary transport of biomass burning emissions. iScience 2023; 26:108125. [PMID: 37876807 PMCID: PMC10590856 DOI: 10.1016/j.isci.2023.108125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/14/2023] [Accepted: 09/28/2023] [Indexed: 10/26/2023] Open
Abstract
Incomplete combustion of fossil fuels and biomass burning emit large amounts of soot particles into the troposphere. The condensation process is considered to influence the size (Dp) and mixing state of soot particles, which affects their solar absorption efficiency and lifetimes. However, quantifying aging evolution of soot remains hampered in the real world because of complicated sources and observation technologies. In the Himalayas, we isolated soot sourced from transboundary transport of biomass burning and revealed soot aging mechanisms through microscopic observations. Most of coated soot particles stabilized one soot core under Dp < 400 nm, but 34.8% of them contained multi-soot cores (nsoot ≥ 2) and nsoot increased 3-9 times with increasing Dp. We established the soot mixing models to quantify transformation from condensation- to coagulation-dominant regime at Dp ≈ 400 nm. Studies provide essential references for adopting mixing rules and quantifying the optical absorption of soot in atmospheric models.
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Affiliation(s)
- Xiyao Chen
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
| | - Chunxiang Ye
- College Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Yuanyuan Wang
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
| | - Zhijun Wu
- College Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Tong Zhu
- College Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Fan Zhang
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
| | - Xiaokun Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Zongbo Shi
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Zhonghua Zheng
- Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Weijun Li
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
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3
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Rérat M, Rayez JC, Fábián B, Devel M, Picaud S. A CRYSTAL-based parameterization of carbon atom dynamic polarizabilities to compute optical properties of curved carbonaceous nanostructures. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02926-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Gorkowski K, Benedict KB, Carrico CM, Dubey MK. Complexities in Modeling Organic Aerosol Light Absorption. J Phys Chem A 2022; 126:4827-4833. [PMID: 35834798 PMCID: PMC9340763 DOI: 10.1021/acs.jpca.2c02236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 07/04/2022] [Indexed: 11/29/2022]
Abstract
Aerosol particles dynamically evolve in the atmosphere by physicochemical interactions with sunlight, trace chemical species, and water. Current modeling approaches fix properties such as aerosol refractive index, introducing spatial and temporal errors in the radiative impacts. Further progress requires a process-level description of the refractive indices as the particles age and experience physicochemical transformations. We present two multivariate modeling approaches of light absorption by brown carbon (BrC). The initial approach was to extend the modeling framework of the refractive index at 589 nm (nD), but that result was insufficient. We developed a second multivariate model using aromatic rings and functional groups to predict the imaginary part of the complex refractive index. This second model agreed better with measured spectral absorption peaks, showing promise for a simplified treatment of BrC optics. In addition to absorption, organic functionalities also alter the water affinity of the molecules, leading to a hygroscopic uptake and increased light absorption, which we show through measurements and modeling.
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Affiliation(s)
- Kyle Gorkowski
- Earth
and Environmental Science, Los Alamos National
Laboratory, Los Alamos, New Mexico 87545, United States
| | - Katherine B. Benedict
- Earth
and Environmental Science, Los Alamos National
Laboratory, Los Alamos, New Mexico 87545, United States
| | - Christian M. Carrico
- New
Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, United States
| | - Manvendra K. Dubey
- Earth
and Environmental Science, Los Alamos National
Laboratory, Los Alamos, New Mexico 87545, United States
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5
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Long-Term Variations in Global Solar Radiation and Its Interaction with Atmospheric Substances at Qomolangma. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19158906. [PMID: 35897279 PMCID: PMC9332281 DOI: 10.3390/ijerph19158906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/20/2022] [Accepted: 07/20/2022] [Indexed: 02/05/2023]
Abstract
An empirical model to estimate global solar radiation was developed at Qomolangma Station using observed solar radiation and meteorological parameters. The predicted hourly global solar radiation agrees well with observations at the ground in 2008–2011. This model was used to calculate global solar radiation at the ground and its loss in the atmosphere due to absorbing and scattering substances in 2007–2020. A sensitivity analysis shows that the responses of global solar radiation to changes in water vapor and scattering factors (expressed as water-vapor pressure and the attenuation factor, AF, respectively) are nonlinear, and global solar radiation is more sensitive to changes in scattering than to changes in absorption. Further applying this empirical model, the albedos at the top of the atmosphere (TOA) and the surface in 2007–2020 were computed and are in line with satellite-based retrievals. During 2007–2020, the mean estimated annual global solar radiation increased by 0.22% per year, which was associated with a decrease in AF of 1.46% and an increase in water-vapor pressure of 0.37% per year. The annual mean air temperature increased by about 0.16 °C over the 14 years. Annual mean losses of solar radiation caused by absorbing and scattering substances and total loss were 2.55, 0.64, and 3.19 MJ m−2, respectively. The annual average absorbing loss was much larger than the scattering loss; their contributions to the total loss were 77.23% and 22.77%, indicating that absorbing substances play significant roles. The annual absorbing loss increased by 0.42% per year, and scattering and total losses decreased by 2.00% and 0.14% per year, respectively. The estimated and satellite-derived annual albedos increased at the TOA and decreased at the surface. This study shows that solar radiation and its interactions with atmospheric absorbing and scattering substances have played key but different roles in regional climate and climate change at the three poles.
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Chatterjee A, Mukherjee S, Dutta M, Ghosh A, Ghosh SK, Roy A. High rise in carbonaceous aerosols under very low anthropogenic emissions over eastern Himalaya, India: Impact of lockdown for COVID-19 outbreak. ATMOSPHERIC ENVIRONMENT (OXFORD, ENGLAND : 1994) 2021; 244:117947. [PMID: 32982563 PMCID: PMC7501850 DOI: 10.1016/j.atmosenv.2020.117947] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 08/28/2020] [Accepted: 09/17/2020] [Indexed: 05/19/2023]
Abstract
The present study has been conducted to investigate the relative changes of carbonaceous aerosols (CA) over a high altitude Himalayan atmosphere with and without (very low) anthropogenic emissions. Measurements of atmospheric organic (OC) and elemental carbon (EC) were conducted during the lockdown period (April 2020) due to global COVID 19 outbreak and compared with the normal period (April 2019). The interesting, unexpected and surprising observation is that OC, EC and the total CA (TCA) during the lockdown (OC: 12.1 ± 5.5 μg m-3; EC: 2.2 ± 1.1 μg m-3; TCA: 21.5 ± 10 μg m-3) were higher than the normal period (OC: 7.04 ± 2.2 μg m-3; EC: 1.9 ± 0.7 μg m-3; TCA: 13.2 ± 4.1 μg m-3). The higher values for OC/EC ratio too was observed during the lockdown (5.7 ± 0.9) compared to the normal period (4.2 ± 1.1). Much higher surface O3 during the lockdown (due to very low NO) could better promote the formation of secondary OC (SOC) through the photochemical oxidation of biogenic volatile organic compounds (BVOCs) emitted from Himalayan coniferous forest cover. SOC during the lockdown (7.6 ± 3.5 μg m-3) was double of that in normal period (3.8 ± 1.4 μg m-3). Regression analysis between SOC and O3 showed that with the same amount of increase in O3, the SOC formation increased to a larger extent when anthropogenic emissions were very low and biogenic emissions dominate (lockdown) compared to when anthropogenic emissions were high (normal). Concentration weighted trajectory (CWT) analysis showed that the anthropogenic activities over Nepal and forest fire over north-east India were the major long-distant sources of the CA over Darjeeling during the normal period. On the other hand, during lockdown, the major source regions of CA over Darjeeling were regional/local. The findings of the study indicate the immense importance of Himalayan biosphere as a major source of organic carbon.
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Affiliation(s)
- Abhijit Chatterjee
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
| | - Sauryadeep Mukherjee
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
| | - Monami Dutta
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
| | - Abhinandan Ghosh
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
| | - Sanjay K Ghosh
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
| | - Arindam Roy
- Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VIIM, Kolkata, 700054, India
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7
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Recent Advances in Quantifying Wet Scavenging Efficiency of Black Carbon Aerosol. ATMOSPHERE 2019. [DOI: 10.3390/atmos10040175] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Black carbon (BC) aerosol is of great importance not only for its strong potential in heating air and impacts on cloud, but also because of its hazards to human health. Wet deposition is regarded as the main sink of BC, constraining its lifetime and thus its impact on the environment and climate. However, substantial controversial and ambiguous issues in the wet scavenging processes of BC are apparent in current studies. Despite of its significance, there are only a small number of field studies that have investigated the incorporation of BC-containing particles into cloud droplets and influencing factors, in particular, the in-cloud scavenging, because it was simplicitly considered in many studies (as part of total wet scavenging). The mass scavenging efficiencies (MSEs) of BC were observed to be varied over the world, and the influencing factors were attributed to physical and chemical properties (e.g., size and chemical compositions) and meteorological conditions (cloud water content, temperature, etc.). In this review, we summarized the MSEs and potential factors that influence the in-cloud and below-cloud scavenging of BC. In general, MSEs of BC are lower at low-altitude regions (urban, suburban, and rural sites) and increase with the rising altitude, which serves as additional evidence that atmospheric aging plays an important role in the chemical modification of BC. Herein, higher altitude sites are more representative of free-tropospheric conditions, where BC is usually more aged. Despite of increasing knowledge of BC–cloud interaction, there are still challenges that need to be addressed to gain a better understanding of the wet scavenging of BC. We recommend that more comprehensive methods should be further estimated to obtain high time-resolved scavenging efficiency (SE) of BC, and to distinguish the impact of in-cloud and below-cloud scavenging on BC mass concentration, which is expected to be useful for constraining the gap between field observation and modeling simulation results.
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8
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Abstract
Aerosol mixing state significantly affects concentrations of cloud condensation nuclei (CCN), wet removal rates, thermodynamic properties, heterogeneous chemistry, and aerosol optical properties, with implications for human health and climate. Over the last two decades, significant research effort has gone into finding computationally-efficient methods for representing the most important aspects of aerosol mixing state in air pollution, weather prediction, and climate models. In this review, we summarize the interactions between mixing-state and aerosol hygroscopicity, optical properties, equilibrium thermodynamics and heterogeneous chemistry. We focus on the effects of simplified assumptions of aerosol mixing state on CCN concentrations, wet deposition, and aerosol absorption. We also summarize previous approaches for representing aerosol mixing state in atmospheric models, and we make recommendations regarding the representation of aerosol mixing state in future modelling studies.
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9
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Sarkar C, Roy A, Chatterjee A, Ghosh SK, Raha S. Factors controlling the long-term (2009-2015) trend of PM 2.5 and black carbon aerosols at eastern Himalaya, India. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 656:280-296. [PMID: 30513422 DOI: 10.1016/j.scitotenv.2018.11.367] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/19/2018] [Accepted: 11/24/2018] [Indexed: 06/09/2023]
Abstract
A first-ever long-term (2009-2015) study on the fine particulate matter (PM2.5) and black carbon (BC) aerosol were conducted over Himalaya in order to investigate the characteristics, temporal variations and the important factors regulating the long-term trend. The study was conducted over a high altitude station, Darjeeling (27°01'N, 88°15'E, 2200 m asl) representing a typical high altitude urban atmosphere at eastern Himalaya in India. The average concentrations of PM2.5 and BC over a period of seven years were 25.2 ± 5.6 μg m-3 (ranging between 2.2 and 220.4 μg m-3) and 3.4 ± 0.7 μg m-3 (0.4 to 15.6 μg m-3) respectively. We observed decreasing trends in both PM2.5 (49% at a rate of 170 ng m-3 month-1) and BC (34% at the rate of 20 ng m-3 month-1) mass concentration over this region from 2009 to 2015. We extensively studied the impact of micrometeorological parameters on the long-term trend in PM2.5 and BC through the correlation analysis. The significant changes in boundary layer dynamics over this region played a major role in the decreasing trend of aerosols. The concentration weighted trajectory analysis revealed that the important contributory long-distant source regions for PM2.5 and BC over eastern Himalaya were Indo Gangetic Plane and Nepal. The contributions from these regions were found to be decreased significantly from 2009 to 2015. Investigations on the fire counts associated with the forest fire, and open burning activities through the satellite observations revealed that the decreasing trend in PM2.5 and BC over eastern Himalaya is well correlated to the decreasing trend in the fire counts over IGP and Nepal. We also explored that the changes and up gradation of the domestic fuel at the Indo Gangetic Plane regions in recent years not only improved the regional air quality but also affected the atmospheric environment over the eastern part of Himalaya.
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Affiliation(s)
- Chirantan Sarkar
- Environmental Science Section, Bose Institute, P 1/12 CIT Scheme VII-M, Kolkata 700054, India
| | - Arindam Roy
- Environmental Science Section, Bose Institute, P 1/12 CIT Scheme VII-M, Kolkata 700054, India
| | - Abhijit Chatterjee
- Environmental Science Section, Bose Institute, P 1/12 CIT Scheme VII-M, Kolkata 700054, India; National Facility on Astroparticle Physics and Space Science, Bose Institute, 16, A.J.C. Bose Road, Darjeeling 734101, India.
| | - Sanjay K Ghosh
- Environmental Science Section, Bose Institute, P 1/12 CIT Scheme VII-M, Kolkata 700054, India; National Facility on Astroparticle Physics and Space Science, Bose Institute, 16, A.J.C. Bose Road, Darjeeling 734101, India; National Center for Astroparticle Physics and Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India
| | - Sibaji Raha
- National Facility on Astroparticle Physics and Space Science, Bose Institute, 16, A.J.C. Bose Road, Darjeeling 734101, India; National Center for Astroparticle Physics and Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India
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10
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Matsui H, Hamilton DS, Mahowald NM. Black carbon radiative effects highly sensitive to emitted particle size when resolving mixing-state diversity. Nat Commun 2018; 9:3446. [PMID: 30150685 PMCID: PMC6110859 DOI: 10.1038/s41467-018-05635-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 07/17/2018] [Indexed: 11/30/2022] Open
Abstract
Post-industrial increases in atmospheric black carbon (BC) have a large but uncertain warming contribution to Earth's climate. Particle size and mixing state determine the solar absorption efficiency of BC and also strongly influence how effectively BC is removed, but they have large uncertainties. Here we use a multiple-mixing-state global aerosol microphysics model and show that the sensitivity (range) of present-day BC direct radiative effect, due to current uncertainties in emission size distributions, is amplified 5-7 times (0.18-0.42 W m-2) when the diversity in BC mixing state is sufficiently resolved. This amplification is caused by the lifetime, core absorption, and absorption enhancement effects of BC, whose variability is underestimated by 45-70% in a single-mixing-state model representation. We demonstrate that reducing uncertainties in emission size distributions and how they change in the future, while also resolving modeled BC mixing state diversity, is now essential when evaluating BC radiative effects and the effectiveness of BC mitigation on future temperature changes.
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Grants
- Ministry of Education, Culture, Sports, Science, and Technology and the Japan Society for the Promotion of Science (MEXT/JSPS) KAKENHI Grant Numbers JP26740014, JP17H04709, JP26241003, JP16H01770, and JP15H05465., Global environment research funds of the Ministry of the Environment, Japan (2-1403, 2-1703).
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Affiliation(s)
- Hitoshi Matsui
- Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan.
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, 14853, USA.
| | - Douglas S Hamilton
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Natalie M Mahowald
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, 14853, USA
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11
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Kaushal D, Kumar A, Yadav S, Tandon A, Attri AK. Wintertime carbonaceous aerosols over Dhauladhar region of North-Western Himalayas. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:8044-8056. [PMID: 29305806 DOI: 10.1007/s11356-017-1060-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Accepted: 12/14/2017] [Indexed: 05/10/2023]
Abstract
Carbonaceous aerosols play an important role in affecting human health, radiative forcing, hydrological cycle, and climate change. As our current understanding about the carbonaceous aerosols, the source(s) and process(es) associated with them in the ecologically sensitive North-Western Himalayas are limited; this systematic study was planned to understand inherent dynamics in the mass concentration and source contribution of carbonaceous aerosols in the Dhauladhar region. During four winter months (January 2015-April 2015), 24-h PM10 samples were collected every week simultaneously at the rural site of Pohara (32.19° N, 76.20° E; 750 m amsl) and the urban location of Dharamshala (32.20° N, 76.32° E; 1350 m amsl). These samples were analyzed by using thermal/optical carbon analyzer for different carbon forms. Organic carbon (OC) dominated over elemental carbon (EC) and was found to be 59.3 and 64.1% in total carbon (TC) at Pohara and Dharamshala, respectively. The respective mass concentrations of OC and EC were higher at Pohara (6.8 ± 2.3 and 4.8 ± 2.0 μg.m-3) in comparison to that observed in Dharamshala (5.0 ± 3.1 and 2.5 ± 0.6 μg.m-3). The OC/EC ratio at Pohara (1.51 ± 0.41) indicates the dominance of fossil fuel combustion (coal and vehicular exhaust), while at Dharamshala, an OC/EC of 2.01 ± 1.07 signified additional contribution from secondary organic carbon (SOC). Diagnostic ratios (OC/EC and char-EC/soot-EC) suggested dominance of emissions from fossil fuel combustion sources over biomass burning sources in the region. Estimated non-sea salt (nss)K+/OC and nssK+/EC ratios indicated heterogeneity within the biomass burning sources over low and high altitude locations. A strong correlation between nssK+ and SOC over a high altitude urban location further suggested possible conversion of gaseous precursors to carbonaceous particles during coniferous wood burning.
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Affiliation(s)
- Deepika Kaushal
- School of Earth and Environmental Sciences, Central University of Himachal Pradesh, Dharamshala, Kangra, H.P., 176215, India
| | - Ajay Kumar
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Shweta Yadav
- Department of Environmental Sciences, Central University of Jammu, Bagla, Rahya Suchani, Samba, Jammu, J&K, 181143, India
| | - Ankit Tandon
- School of Earth and Environmental Sciences, Central University of Himachal Pradesh, Dharamshala, Kangra, H.P., 176215, India.
| | - Arun K Attri
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
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12
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Characteristics of Particulate Carbon in Precipitation during the Rainy Season in Xiamen Island, China. ATMOSPHERE 2016. [DOI: 10.3390/atmos7110140] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Fierce L, Bond TC, Bauer SE, Mena F, Riemer N. Black carbon absorption at the global scale is affected by particle-scale diversity in composition. Nat Commun 2016; 7:12361. [PMID: 27580627 PMCID: PMC5025768 DOI: 10.1038/ncomms12361] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 06/24/2016] [Indexed: 11/22/2022] Open
Abstract
Atmospheric black carbon (BC) exerts a strong, but uncertain, warming effect on the climate. BC that is coated with non-absorbing material absorbs more strongly than the same amount of BC in an uncoated particle, but the magnitude of this absorption enhancement (Eabs) is not well constrained. Modelling studies and laboratory measurements have found stronger absorption enhancement than has been observed in the atmosphere. Here, using a particle-resolved aerosol model to simulate diverse BC populations, we show that absorption is overestimated by as much as a factor of two if diversity is neglected and population-averaged composition is assumed across all BC-containing particles. If, instead, composition diversity is resolved, we find Eabs=1−1.5 at low relative humidity, consistent with ambient observations. This study offers not only an explanation for the discrepancy between modelled and observed absorption enhancement, but also demonstrates how particle-scale simulations can be used to develop relationships for global-scale models. Model and laboratory experiments disagree with observations regarding the absorption properties of black carbon particles. Here, using a particle-resolved aerosol model, the authors show that when composition diversity is considered, absorption enhancement is consistent with ambient observations.
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Affiliation(s)
- Laura Fierce
- Department of Environmental and Climate Sciences , Brookhaven National Laboratory, Upton, New York 11973, USA.,Visiting Scientists Program, University Corporation for Atmospheric Research, Boulder, Colorado 80307, USA
| | - Tami C Bond
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Susanne E Bauer
- NASA Goddard Institute for Space Studies, New York City, New York 10025, USA.,The Earth Institute, Columbia University, New York City, New York 10025, USA
| | - Francisco Mena
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Nicole Riemer
- Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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14
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Pöschl U, Shiraiwa M. Multiphase chemistry at the atmosphere-biosphere interface influencing climate and public health in the anthropocene. Chem Rev 2015; 115:4440-75. [PMID: 25856774 DOI: 10.1021/cr500487s] [Citation(s) in RCA: 214] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ulrich Pöschl
- Multiphase Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - Manabu Shiraiwa
- Multiphase Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
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15
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Zhang Q, Thompson J. Effect of particle mixing morphology on aerosol scattering and absorption: A discrete dipole modeling study. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.grj.2014.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Zhu CS, Cao JJ, Tsai CJ, Shen ZX, Han YM, Liu SX, Zhao ZZ. Comparison and implications of PM₂.₅ carbon fractions in different environments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 466-467:203-209. [PMID: 23895783 DOI: 10.1016/j.scitotenv.2013.07.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 06/01/2013] [Accepted: 07/08/2013] [Indexed: 05/27/2023]
Abstract
The concentrations of PM₂.₅ carbon fractions in rural, urban, tunnel and remote environments were measured using the IMPROVE thermal optical reflectance (TOR) method. The highest OC1 and EC1 concentrations were found for tunnel samples, while the highest OC2, OC3, and OC4 concentrations were observed for urban winter samples, respectively. The lowest levels of most carbon fractions were found for remote samples. The percentage contributions of carbon fractions to total carbon (TC) were characterized by one peak (at rural and remote sites) and two peaks (at urban and tunnel sites) with different carbon fractions, respectively. The abundance of char in tunnel and urban environments was observed, which might partly be due to traffic-related tire-wear. Various percentages of optically scattering OC and absorbing EC fractions to TC were found in the four different environments. In addition, the contribution of heating carbon fractions (char and soot) indicated various warming effects per unit mass of TC. The ratios of OC/EC and char/soot at the sites were shown to be source indicators. The investigation of carbon fractions at different sites may provide some information for improving model parameters in estimating their radiative effects.
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Affiliation(s)
- Chong-Shu Zhu
- Key Lab of Aerosol Science & Technology, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China.
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17
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Niu H, Shao L, Zhang D. Soot particles at an elevated site in eastern China during the passage of a strong cyclone. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 430:217-222. [PMID: 22652010 DOI: 10.1016/j.scitotenv.2012.04.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 04/18/2012] [Accepted: 04/19/2012] [Indexed: 06/01/2023]
Abstract
Atmospheric particles larger than 0.2 μm were collected at the top of Mt. Tai (36.25°N, 117.10°E, 1534 m a.s.l.) in eastern China in May 2008 during the passage of a strong cyclone. The particles were analyzed with electron microscopes and characterized by morphology, equivalent diameter and elemental composition. Soot particles with coating (coated soot particles) and those without apparent coating (naked soot particles) were predominant in the diameter range smaller than 0.6 μm in all samples. The number-size distribution of the relative abundance of naked soot particles in the prefrontal air was similar to that in the postfrontal air and their size modes were around 0.2-0.3 μm. However, the distribution of inclusions of coated soot particles showed a mode in the range of 0.1-0.3 μm. The coating degree of coated soot particles, which was defined by the ratio of the diameter of inclusion to the diameter of particle body, showed a mode around 0.5 with the range of 0.3-0.6. These results indicate that the status of soot particles in the prefrontal and postfrontal air was similar although air pollution levels were dramatically different. In addition, the relative abundance of accumulation mode particles increased with the decrease of soot particles after the front passage.
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Affiliation(s)
- Hongya Niu
- State Key Laboratory of Coal Resources and Safe Mining, School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
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18
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Loh ND, Hampton CY, Martin AV, Starodub D, Sierra RG, Barty A, Aquila A, Schulz J, Lomb L, Steinbrener J, Shoeman RL, Kassemeyer S, Bostedt C, Bozek J, Epp SW, Erk B, Hartmann R, Rolles D, Rudenko A, Rudek B, Foucar L, Kimmel N, Weidenspointner G, Hauser G, Holl P, Pedersoli E, Liang M, Hunter MS, Hunter MM, Gumprecht L, Coppola N, Wunderer C, Graafsma H, Maia FRNC, Ekeberg T, Hantke M, Fleckenstein H, Hirsemann H, Nass K, White TA, Tobias HJ, Farquar GR, Benner WH, Hau-Riege SP, Reich C, Hartmann A, Soltau H, Marchesini S, Bajt S, Barthelmess M, Bucksbaum P, Hodgson KO, Strüder L, Ullrich J, Frank M, Schlichting I, Chapman HN, Bogan MJ. Fractal morphology, imaging and mass spectrometry of single aerosol particles in flight. Nature 2012; 486:513-7. [PMID: 22739316 DOI: 10.1038/nature11222] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Accepted: 05/09/2012] [Indexed: 11/09/2022]
Abstract
The morphology of micrometre-size particulate matter is of critical importance in fields ranging from toxicology to climate science, yet these properties are surprisingly difficult to measure in the particles' native environment. Electron microscopy requires collection of particles on a substrate; visible light scattering provides insufficient resolution; and X-ray synchrotron studies have been limited to ensembles of particles. Here we demonstrate an in situ method for imaging individual sub-micrometre particles to nanometre resolution in their native environment, using intense, coherent X-ray pulses from the Linac Coherent Light Source free-electron laser. We introduced individual aerosol particles into the pulsed X-ray beam, which is sufficiently intense that diffraction from individual particles can be measured for morphological analysis. At the same time, ion fragments ejected from the beam were analysed using mass spectrometry, to determine the composition of single aerosol particles. Our results show the extent of internal dilation symmetry of individual soot particles subject to non-equilibrium aggregation, and the surprisingly large variability in their fractal dimensions. More broadly, our methods can be extended to resolve both static and dynamic morphology of general ensembles of disordered particles. Such general morphology has implications in topics such as solvent accessibilities in proteins, vibrational energy transfer by the hydrodynamic interaction of amino acids, and large-scale production of nanoscale structures by flame synthesis.
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Affiliation(s)
- N D Loh
- PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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19
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Bahadur R, Russell LM, Jacobson MZ, Prather K, Nenes A, Adams P, Seinfeld JH. Importance of composition and hygroscopicity of BC particles to the effect of BC mitigation on cloud properties: Application to California conditions. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd017265] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Ten Hoeve JE, Jacobson MZ, Remer LA. Comparing results from a physical model with satellite and in situ observations to determine whether biomass burning aerosols over the Amazon brighten or burn off clouds. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016856] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Metcalf AR, Craven JS, Ensberg JJ, Brioude J, Angevine W, Sorooshian A, Duong HT, Jonsson HH, Flagan RC, Seinfeld JH. Black carbon aerosol over the Los Angeles Basin during CalNex. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd017255] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Jacobson MZ. Investigating cloud absorption effects: Global absorption properties of black carbon, tar balls, and soil dust in clouds and aerosols. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd017218] [Citation(s) in RCA: 137] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Li J, Mlawer E, Chýlek P. Parameterization of cloud optical properties for semidirect radiative forcing. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jd016611] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jiangnan Li
- Canadian Centre for Climate Modelling and Analysis, Science and Technology Branch, Environment Canada; University of Victoria; Victoria, British Columbia Canada
| | - Eli Mlawer
- Atmospheric and Environmental Research, Inc.; Lexington Massachusetts USA
| | - Petr Chýlek
- Space and Remote Sensing; Los Alamos National Laboratory; Los Alamos New Mexico USA
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Kawase H, Takemura T, Nozawa T. Impact of carbonaceous aerosols on precipitation in tropical Africa during the austral summer in the twentieth century. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jd015933] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Coupling of Important Physical Processes in the Planetary Boundary Layer between Meteorological and Chemistry Models for Regional to Continental Scale Air Quality Forecasting: An Overview. ATMOSPHERE 2011. [DOI: 10.3390/atmos2030464] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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26
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Jacobson MZ. Short-term effects of controlling fossil-fuel soot, biofuel soot and gases, and methane on climate, Arctic ice, and air pollution health. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013795] [Citation(s) in RCA: 232] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
To limit mean global warming to 2 degrees C, a goal supported by more than 100 countries, it will likely be necessary to reduce emissions not only of greenhouse gases but also of air pollutants with high radiative forcing (RF), particularly black carbon (BC). Although several recent research papers have attempted to quantify the effects of BC on climate, not all these analyses have incorporated all the mechanisms that contribute to its RF (including the effects of BC on cloud albedo, cloud coverage, and snow and ice albedo, and the optical consequences of aerosol mixing) and have reported their results in different units and with different ranges of uncertainty. Here we attempt to reconcile their results and present them in uniform units that include the same forcing factors. We use the best estimate of effective RF obtained from these results to analyze the benefits of mitigating BC emissions for achieving a specific equilibrium temperature target. For a 500 ppm CO(2)e (3.1 W m(-2)) effective RF target in 2100, which would offer about a 50% chance of limiting equilibrium warming to 2.5 degrees C above preindustrial temperatures, we estimate that failing to reduce carbonaceous aerosol emissions from contained combustion would require CO(2) emission cuts about 8 years (range of 1-15 years) earlier than would be necessary with full mitigation of these emissions.
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28
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Abstract
This study examines the vertically resolved cloud measurements from the cloud-aerosol lidar with orthogonal polarization instrument on Aqua satellite from June 2006 through May 2007 to estimate the extent to which the mixed cloud-phase composition can vary according to the ambient temperature, an important concern for the uncertainty in calculating cloud radiative effects. At -20 degrees C, the global average fraction of supercooled clouds in the total cloud population is found to be about 50% in the data period. Between -10 and -40 degrees C, the fraction is smaller at lower temperatures. However, there are appreciable regional and temporal deviations from the global mean (> +/- 20%) at the isotherm. In the analysis with coincident dust aerosol data from the same instrument, it appears that the variation in the supercooled cloud fraction is negatively correlated with the frequencies of dust aerosols at the -20 degrees C isotherm. This result suggests a possibility that dust particles lifted to the cold cloud layer effectively glaciate supercooled clouds. Observations of radiative flux from the clouds and earth's radiant energy system instrument aboard Terra satellite, as well as radiative transfer model simulations, show that the 20% variation in the supercooled cloud fraction is quantitatively important in cloud radiative effects, especially in shortwave, which are 10-20 W m(-2) for regions of mixed-phase clouds affected by dust. In particular, our results demonstrate that dust, by glaciating supercooled water, can decrease albedo, thus compensating for the increase in albedo due to the dust aerosols themselves. This has important implications for the determination of climate sensitivity.
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29
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Adler G, Riziq AA, Erlick C, Rudich Y. Effect of intrinsic organic carbon on the optical properties of fresh diesel soot. Proc Natl Acad Sci U S A 2010; 107:6699-704. [PMID: 20018649 PMCID: PMC2872371 DOI: 10.1073/pnas.0903311106] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study focuses on the retrieval of the normalized mass absorption cross section (MAC) of soot using theoretical calculations that incorporate new measurements of the optical properties of organic carbon (OC) intrinsic to fresh diesel soot. Intrinsic OC was extracted by water and an organic solvent, and the complex refractive index of the extracted OC was derived at 532 and 355-nm wavelengths using cavity ring-down aerosol spectrometry. The extracted OC was found to absorb weakly in the visible wavelengths and moderately at blue wavelengths. The mass ratio of OC and elemental carbon (EC) in the collected particles was evaluated using a thermo-optical method. The measured EC/OC ratio in the soot exhibited substantial variability from measurement to measurement, ranging between 2 and 5. To test the sensitivity of the MAC to this variability, three different EC/OC ratios (21, 11, and 12) were chosen as representative. Particle size and spherule morphology were estimated using scanning electron microscopy, and the soot was found to be primarily in the form of aggregates with a dominant aggregate diameter mode in the range 200-250 nm. The measured refractive index of the extracted OC was used with a variety of theoretical models to calculate the MAC of internally mixed diesel soot at 532 and 355 nm. We conclude that Rayleigh-Debye-Gans theory on clusters of coated spherules and T-matrix of a solid EC spheroid coated by intrinsic OC are both consistent with previous measurements; however, Rayleigh-Debye-Gans theory provides a more realistic physical model for the calculation.
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Affiliation(s)
- Gabriella Adler
- Department of Environmental Sciences, Weizmann Institute, Rehovot 76100, Israel; and
| | - Ali Abo Riziq
- Department of Environmental Sciences, Weizmann Institute, Rehovot 76100, Israel; and
| | - Carynelisa Erlick
- Department of Atmospheric Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Yinon Rudich
- Department of Environmental Sciences, Weizmann Institute, Rehovot 76100, Israel; and
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30
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Lang-Yona N, Abo-Riziq A, Erlick C, Segre E, Trainic M, Rudich Y. Interaction of internally mixed aerosols with light. Phys Chem Chem Phys 2010; 12:21-31. [DOI: 10.1039/b913176k] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Freedman MA, Hasenkopf CA, Beaver MR, Tolbert MA. Optical Properties of Internally Mixed Aerosol Particles Composed of Dicarboxylic Acids and Ammonium Sulfate. J Phys Chem A 2009; 113:13584-92. [DOI: 10.1021/jp906240y] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Miriam A. Freedman
- Cooperative Institute for Research in Environmental Sciences (CIRES), Department of Atmospheric and Oceanic Sciences, and Department of Chemistry and Biochemistry, University of Colorado Boulder, Colorado 80309
| | - Christa A. Hasenkopf
- Cooperative Institute for Research in Environmental Sciences (CIRES), Department of Atmospheric and Oceanic Sciences, and Department of Chemistry and Biochemistry, University of Colorado Boulder, Colorado 80309
| | - Melinda R. Beaver
- Cooperative Institute for Research in Environmental Sciences (CIRES), Department of Atmospheric and Oceanic Sciences, and Department of Chemistry and Biochemistry, University of Colorado Boulder, Colorado 80309
| | - Margaret A. Tolbert
- Cooperative Institute for Research in Environmental Sciences (CIRES), Department of Atmospheric and Oceanic Sciences, and Department of Chemistry and Biochemistry, University of Colorado Boulder, Colorado 80309
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32
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Li W, Shao L. Transmission electron microscopy study of aerosol particles from the brown hazes in northern China. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd011285] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Jacobson MZ, Streets DG. Influence of future anthropogenic emissions on climate, natural emissions, and air quality. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd011476] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Jacobson MZ. Short-term effects of agriculture on air pollution and climate in California. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008jd010689] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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35
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Schwarz JP, Spackman JR, Fahey DW, Gao RS, Lohmann U, Stier P, Watts LA, Thomson DS, Lack DA, Pfister L, Mahoney MJ, Baumgardner D, Wilson JC, Reeves JM. Coatings and their enhancement of black carbon light absorption in the tropical atmosphere. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009042] [Citation(s) in RCA: 222] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Dinar E, Riziq AA, Spindler C, Erlick C, Kiss G, Rudich Y. The complex refractive index of atmospheric and model humic-like substances (HULIS) retrieved by a cavity ring down aerosol spectrometer (CRD-AS). Faraday Discuss 2008; 137:279-95; discussion 297-318. [PMID: 18214110 DOI: 10.1039/b703111d] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- E Dinar
- Department of Environmental Sciences, Weizmann Institute, Rehovot 76100, Israel
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37
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Jacobson MZ, Kaufman YJ, Rudich Y. Examining feedbacks of aerosols to urban climate with a model that treats 3-D clouds with aerosol inclusions. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jd008922] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Hadley OL, Ramanathan V, Carmichael GR, Tang Y, Corrigan CE, Roberts GC, Mauger GS. Trans-Pacific transport of black carbon and fine aerosols (D< 2.5μm) into North America. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007632] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Abstract
Pollution and smoke aerosols can increase or decrease the cloud cover. This duality in the effects of aerosols forms one of the largest uncertainties in climate research. Using solar measurements from Aerosol Robotic Network sites around the globe, we show an increase in cloud cover with an increase in the aerosol column concentration and an inverse dependence on the aerosol absorption of sunlight. The emerging rule appears to be independent of geographical location or aerosol type, thus increasing our confidence in the understanding of these aerosol effects on the clouds and climate. Preliminary estimates suggest an increase of 5% in cloud cover.
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Affiliation(s)
- Yoram J Kaufman
- NASA/Goddard Space Flight Center, 613.2, Greenbelt, MD 20771, USA
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