A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer
Nitrogen oxides, collectively referred to as NOx (NO + NO2), are an important component of atmospheric chemistry involved in the production and destruction of various oxidants that contribute to the oxidative capacity of the troposphere. The primary sink for NOx is atmospheric nitrate, which has an...
Published in: | Atmospheric Chemistry and Physics |
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00066526 2023-06-11T04:07:11+02:00 A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer Burger, Jessica M. Joyce, Emily Hastings, Meredith G. Spence, Kurt A. M. Altieri, Katye E. 2023-05 electronic https://doi.org/10.5194/acp-23-5605-2023 https://noa.gwlb.de/receive/cop_mods_00066526 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065007/acp-23-5605-2023.pdf https://acp.copernicus.org/articles/23/5605/2023/acp-23-5605-2023.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-23-5605-2023 https://noa.gwlb.de/receive/cop_mods_00066526 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065007/acp-23-5605-2023.pdf https://acp.copernicus.org/articles/23/5605/2023/acp-23-5605-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/acp-23-5605-2023 2023-05-28T23:18:40Z Nitrogen oxides, collectively referred to as NOx (NO + NO2), are an important component of atmospheric chemistry involved in the production and destruction of various oxidants that contribute to the oxidative capacity of the troposphere. The primary sink for NOx is atmospheric nitrate, which has an influence on climate and the biogeochemical cycling of reactive nitrogen. NOx sources and NOx-to-NO 3- formation pathways remain poorly constrained in the remote marine boundary layer of the Southern Ocean, particularly outside of the more frequently sampled summer months. This study presents seasonally resolved measurements of the isotopic composition (δ15N, δ18O, and Δ17O) of atmospheric nitrate in coarse-mode (> 1 µm) aerosols, collected between South Africa and the sea ice edge in summer, winter, and spring. Similar latitudinal trends in δ15N–NO 3- were observed in summer and spring, suggesting similar NOx sources. Based on δ15N–NO 3-, the main NOx sources were likely a combination of lightning, biomass burning, and/or soil emissions at the low latitudes, as well as oceanic alkyl nitrates and snowpack emissions from continental Antarctica or the sea ice at the mid-latitudes and high latitudes, respectively. Snowpack emissions associated with photolysis were derived from both the Antarctic snowpack and snow on sea ice. A combination of natural NOx sources, likely transported from the lower-latitude Atlantic, contribute to the background-level NO 3- observed in winter, with the potential for a stratospheric NO 3- source evidenced by one sample of Antarctic origin. Greater values of δ18O–NO 3- in spring and winter compared to summer suggest an increased influence of oxidation pathways that incorporate oxygen atoms from O3 into the end product NO 3- (i.e. N2O5, DMS, and halogen oxides (XO)). Significant linear relationships between δ18O and Δ17O suggest isotopic mixing between H2O(v) and O3 in winter and isotopic mixing between H2O(v) and O3/XO in spring. The onset of sunlight in spring, coupled with large sea ice ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Southern Ocean Niedersächsisches Online-Archiv NOA Antarctic Southern Ocean The Antarctic Atmospheric Chemistry and Physics 23 10 5605 5622 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Burger, Jessica M. Joyce, Emily Hastings, Meredith G. Spence, Kurt A. M. Altieri, Katye E. A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
topic_facet |
article Verlagsveröffentlichung |
description |
Nitrogen oxides, collectively referred to as NOx (NO + NO2), are an important component of atmospheric chemistry involved in the production and destruction of various oxidants that contribute to the oxidative capacity of the troposphere. The primary sink for NOx is atmospheric nitrate, which has an influence on climate and the biogeochemical cycling of reactive nitrogen. NOx sources and NOx-to-NO 3- formation pathways remain poorly constrained in the remote marine boundary layer of the Southern Ocean, particularly outside of the more frequently sampled summer months. This study presents seasonally resolved measurements of the isotopic composition (δ15N, δ18O, and Δ17O) of atmospheric nitrate in coarse-mode (> 1 µm) aerosols, collected between South Africa and the sea ice edge in summer, winter, and spring. Similar latitudinal trends in δ15N–NO 3- were observed in summer and spring, suggesting similar NOx sources. Based on δ15N–NO 3-, the main NOx sources were likely a combination of lightning, biomass burning, and/or soil emissions at the low latitudes, as well as oceanic alkyl nitrates and snowpack emissions from continental Antarctica or the sea ice at the mid-latitudes and high latitudes, respectively. Snowpack emissions associated with photolysis were derived from both the Antarctic snowpack and snow on sea ice. A combination of natural NOx sources, likely transported from the lower-latitude Atlantic, contribute to the background-level NO 3- observed in winter, with the potential for a stratospheric NO 3- source evidenced by one sample of Antarctic origin. Greater values of δ18O–NO 3- in spring and winter compared to summer suggest an increased influence of oxidation pathways that incorporate oxygen atoms from O3 into the end product NO 3- (i.e. N2O5, DMS, and halogen oxides (XO)). Significant linear relationships between δ18O and Δ17O suggest isotopic mixing between H2O(v) and O3 in winter and isotopic mixing between H2O(v) and O3/XO in spring. The onset of sunlight in spring, coupled with large sea ice ... |
format |
Article in Journal/Newspaper |
author |
Burger, Jessica M. Joyce, Emily Hastings, Meredith G. Spence, Kurt A. M. Altieri, Katye E. |
author_facet |
Burger, Jessica M. Joyce, Emily Hastings, Meredith G. Spence, Kurt A. M. Altieri, Katye E. |
author_sort |
Burger, Jessica M. |
title |
A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
title_short |
A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
title_full |
A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
title_fullStr |
A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
title_full_unstemmed |
A seasonal analysis of aerosol NO3− sources and NOx oxidation pathways in the Southern Ocean marine boundary layer |
title_sort |
seasonal analysis of aerosol no3− sources and nox oxidation pathways in the southern ocean marine boundary layer |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-5605-2023 https://noa.gwlb.de/receive/cop_mods_00066526 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065007/acp-23-5605-2023.pdf https://acp.copernicus.org/articles/23/5605/2023/acp-23-5605-2023.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-23-5605-2023 https://noa.gwlb.de/receive/cop_mods_00066526 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065007/acp-23-5605-2023.pdf https://acp.copernicus.org/articles/23/5605/2023/acp-23-5605-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-23-5605-2023 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
23 |
container_issue |
10 |
container_start_page |
5605 |
op_container_end_page |
5622 |
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1768379997709402112 |