Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols
Environmental implications of climate change are complex and exhibit regional variations both within and between the polar regions. The increase of solar UV radiation flux over Antarctica due to stratospheric ozone depletion creates the optimal conditions for photochemical reactions on the snow. Mod...
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Online Access: | http://www.osti.gov/servlets/purl/1842815 https://www.osti.gov/biblio/1842815 https://doi.org/10.1016/j.scitotenv.2020.143586 |
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ftosti:oai:osti.gov:1842815 2023-07-30T03:58:11+02:00 Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols Gonçalves, Sérgio J. Weis, Johannes China, Swarup Evangelista, Heitor Harder, Tristan H. Müller, Simon Sampaio, Marcelo Laskin, Alexander Gilles, Mary K. Godoi, Ricardo H.M. 2022-06-27 application/pdf http://www.osti.gov/servlets/purl/1842815 https://www.osti.gov/biblio/1842815 https://doi.org/10.1016/j.scitotenv.2020.143586 unknown http://www.osti.gov/servlets/purl/1842815 https://www.osti.gov/biblio/1842815 https://doi.org/10.1016/j.scitotenv.2020.143586 doi:10.1016/j.scitotenv.2020.143586 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1016/j.scitotenv.2020.143586 2023-07-11T10:09:50Z Environmental implications of climate change are complex and exhibit regional variations both within and between the polar regions. The increase of solar UV radiation flux over Antarctica due to stratospheric ozone depletion creates the optimal conditions for photochemical reactions on the snow. Modeling, laboratory, and indirect field studies suggest that snowpack process release gases to the atmosphere that can react on sea salt particles in remote regions such as Antarctica, modifying aerosol composition and physical properties of aerosols. Here, we present evidence of photochemical processing in West Antarctica aerosols using microscopic and chemical speciation of individual atmospheric particles. Individual aerosol particles collected at the Brazilian module Criosfera 1 were analyzed by scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS) combined with computer controlled scanning electron microscopy (CCSEM) with energy-dispersive X-ray (EDX) microanalysis. The displacement of chlorine relative to sodium was observed over most of the sea salt particles. Particles with a chemical composition consistent with NaCl-NO3 contributed up to 30% of atmospheric particles investigated. Overall, this study provides evidence that the snowpack and particulate nitrate photolysis should be considered in dynamic partition equilibrium in the troposphere. Finally, these findings may assist in reducing modeling uncertainties and present new insights into the aerosol chemical composition in the polar environment. Other/Unknown Material Antarc* Antarctica West Antarctica SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) West Antarctica Science of The Total Environment 758 143586 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Gonçalves, Sérgio J. Weis, Johannes China, Swarup Evangelista, Heitor Harder, Tristan H. Müller, Simon Sampaio, Marcelo Laskin, Alexander Gilles, Mary K. Godoi, Ricardo H.M. Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Environmental implications of climate change are complex and exhibit regional variations both within and between the polar regions. The increase of solar UV radiation flux over Antarctica due to stratospheric ozone depletion creates the optimal conditions for photochemical reactions on the snow. Modeling, laboratory, and indirect field studies suggest that snowpack process release gases to the atmosphere that can react on sea salt particles in remote regions such as Antarctica, modifying aerosol composition and physical properties of aerosols. Here, we present evidence of photochemical processing in West Antarctica aerosols using microscopic and chemical speciation of individual atmospheric particles. Individual aerosol particles collected at the Brazilian module Criosfera 1 were analyzed by scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS) combined with computer controlled scanning electron microscopy (CCSEM) with energy-dispersive X-ray (EDX) microanalysis. The displacement of chlorine relative to sodium was observed over most of the sea salt particles. Particles with a chemical composition consistent with NaCl-NO3 contributed up to 30% of atmospheric particles investigated. Overall, this study provides evidence that the snowpack and particulate nitrate photolysis should be considered in dynamic partition equilibrium in the troposphere. Finally, these findings may assist in reducing modeling uncertainties and present new insights into the aerosol chemical composition in the polar environment. |
author |
Gonçalves, Sérgio J. Weis, Johannes China, Swarup Evangelista, Heitor Harder, Tristan H. Müller, Simon Sampaio, Marcelo Laskin, Alexander Gilles, Mary K. Godoi, Ricardo H.M. |
author_facet |
Gonçalves, Sérgio J. Weis, Johannes China, Swarup Evangelista, Heitor Harder, Tristan H. Müller, Simon Sampaio, Marcelo Laskin, Alexander Gilles, Mary K. Godoi, Ricardo H.M. |
author_sort |
Gonçalves, Sérgio J. |
title |
Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
title_short |
Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
title_full |
Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
title_fullStr |
Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
title_full_unstemmed |
Photochemical reactions on aerosols at West Antarctica: A molecular case-study of nitrate formation among sea salt aerosols |
title_sort |
photochemical reactions on aerosols at west antarctica: a molecular case-study of nitrate formation among sea salt aerosols |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1842815 https://www.osti.gov/biblio/1842815 https://doi.org/10.1016/j.scitotenv.2020.143586 |
geographic |
West Antarctica |
geographic_facet |
West Antarctica |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_relation |
http://www.osti.gov/servlets/purl/1842815 https://www.osti.gov/biblio/1842815 https://doi.org/10.1016/j.scitotenv.2020.143586 doi:10.1016/j.scitotenv.2020.143586 |
op_doi |
https://doi.org/10.1016/j.scitotenv.2020.143586 |
container_title |
Science of The Total Environment |
container_volume |
758 |
container_start_page |
143586 |
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1772821065304637440 |