1
|
Romanias MN, Ren Y, Grosselin B, Daële V, Mellouki A, Dagsson-Waldhauserova P, Thevenet F. Reactive uptake of NO 2 on volcanic particles: A possible source of HONO in the atmosphere. J Environ Sci (China) 2020; 95:155-164. [PMID: 32653175 DOI: 10.1016/j.jes.2020.03.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 11/28/2019] [Accepted: 03/17/2020] [Indexed: 06/11/2023]
Abstract
The heterogeneous degradation of nitrogen dioxide (NO2) on five samples of natural Icelandic volcanic particles has been investigated. Laboratory experiments were carried out under simulated atmospheric conditions using a coated wall flow tube (CWFT). The CWFT reactor was coupled to a blue light nitrogen oxides analyzer (NOx analyzer), and a long path absorption photometer (LOPAP) to monitor in real time the concentrations of NO2, NO and HONO, respectively. Under dark and ambient relative humidity conditions, the steady state uptake coefficients of NO2 varied significantly between the volcanic samples probably due to differences in magma composition and morphological variation related with the density of surface OH groups. The irradiation of the surface with simulated sunlight enhanced the uptake coefficients by a factor of three indicating that photo-induced processes on the surface of the dust occur. Furthermore, the product yields of NO and HONO were determined under both dark and simulated sunlight conditions. The relative humidity was found to influence the distribution of gaseous products, promoting the formation of gaseous HONO. A detailed reaction mechanism is proposed that supports our experimental observations. Regarding the atmospheric implications, our results suggest that the NO2 degradation on volcanic particles and the corresponding formation of HONO is expected to be significant during volcanic dust storms or after a volcanic eruption.
Collapse
Affiliation(s)
| | | | | | | | | | - Pavla Dagsson-Waldhauserova
- Agricultural University of Iceland, Keldnaholt, Reykjavik 112, Iceland; Faculty of Environmental Sciences, Czech University of Life Sciences, Prague 165 21, Czech Republic
| | | |
Collapse
|
2
|
Romer PS, Wooldridge PJ, Crounse JD, Kim MJ, Wennberg PO, Dibb JE, Scheuer E, Blake DR, Meinardi S, Brosius AL, Thames AB, Miller DO, Brune WH, Hall SR, Ryerson TB, Cohen RC. Constraints on Aerosol Nitrate Photolysis as a Potential Source of HONO and NO x. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:13738-13746. [PMID: 30407797 DOI: 10.1021/acs.est.8b03861] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The concentration of nitrogen oxides (NO x) plays a central role in controlling air quality. On a global scale, the primary sink of NO x is oxidation to form HNO3. Gas-phase HNO3 photolyses slowly with a lifetime in the troposphere of 10 days or more. However, several recent studies examining HONO chemistry have proposed that particle-phase HNO3 undergoes photolysis 10-300 times more rapidly than gas-phase HNO3. We present here constraints on the rate of particle-phase HNO3 photolysis based on observations of NO x and HNO3 collected over the Yellow Sea during the KORUS-AQ study in summer 2016. The fastest proposed photolysis rates are inconsistent with the observed NO x to HNO3 ratios. Negligible to moderate enhancements of the HNO3 photolysis rate in particles, 1-30 times faster than in the gas phase, are most consistent with the observations. Small or moderate enhancement of particle-phase HNO3 photolysis would not significantly affect the HNO3 budget but could help explain observations of HONO and NO x in highly aged air.
Collapse
Affiliation(s)
- Paul S Romer
- Department of Chemistry , University of California Berkeley , Berkeley , California 94720 , United States
| | - Paul J Wooldridge
- Department of Chemistry , University of California Berkeley , Berkeley , California 94720 , United States
| | - John D Crounse
- Division of Geological and Planetary Sciences , California Institute of Technology , Pasadena , California 91125 , United States
| | - Michelle J Kim
- Division of Geological and Planetary Sciences , California Institute of Technology , Pasadena , California 91125 , United States
| | - Paul O Wennberg
- Division of Geological and Planetary Sciences , California Institute of Technology , Pasadena , California 91125 , United States
- Division of Engineering and Applied Science , California Institute of Technology , Pasadena , California 91125 , United States
| | - Jack E Dibb
- Institute for the Study of Earth, Oceans, and Space , University of New Hampshire , Durham, New Hampshire 03824 , United States
| | - Eric Scheuer
- Institute for the Study of Earth, Oceans, and Space , University of New Hampshire , Durham, New Hampshire 03824 , United States
| | - Donald R Blake
- Department of Chemistry , University of California Irvine , Irvine , California 92697 , United States
| | - Simone Meinardi
- Department of Chemistry , University of California Irvine , Irvine , California 92697 , United States
| | - Alexandra L Brosius
- Department of Meteorology and Atmospheric Science , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Alexander B Thames
- Department of Meteorology and Atmospheric Science , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - David O Miller
- Department of Meteorology and Atmospheric Science , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - William H Brune
- Department of Meteorology and Atmospheric Science , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Samuel R Hall
- Atmospheric Chemistry Observations and Modeling Laboratory, NCAR , Boulder , Colorado 80301 , United States
| | - Thomas B Ryerson
- Chemical Sciences Division , NOAA Earth System Research Laboratory , Boulder , Colorado 80305 , United States
| | - Ronald C Cohen
- Department of Chemistry , University of California Berkeley , Berkeley , California 94720 , United States
- Department of Earth and Planetary Sciences , University of California Berkeley , Berkeley , California 94720 , United States
| |
Collapse
|