Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study
Distinct diurnal and seasonal variations of mercury (Hg) have been observed in near-surface air at Concordia Station on the East Antarctic Plateau, but the processes controlling these characteristics are not well understood. Here, we use a box model to interpret the Hg0 (gaseous elemental mercury) m...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00041391 2023-05-15T14:02:33+02:00 Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study Song, Shaojie Angot, Hélène Selin, Noelle E. Gallée, Hubert Sprovieri, Francesca Pirrone, Nicola Helmig, Detlev Savarino, Joël Magand, Olivier Dommergue, Aurélien 2018-11 electronic https://doi.org/10.5194/acp-18-15825-2018 https://noa.gwlb.de/receive/cop_mods_00041391 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041011/acp-18-15825-2018.pdf https://acp.copernicus.org/articles/18/15825/2018/acp-18-15825-2018.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-18-15825-2018 https://noa.gwlb.de/receive/cop_mods_00041391 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041011/acp-18-15825-2018.pdf https://acp.copernicus.org/articles/18/15825/2018/acp-18-15825-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/acp-18-15825-2018 2022-02-08T22:41:40Z Distinct diurnal and seasonal variations of mercury (Hg) have been observed in near-surface air at Concordia Station on the East Antarctic Plateau, but the processes controlling these characteristics are not well understood. Here, we use a box model to interpret the Hg0 (gaseous elemental mercury) measurements in thes year 2013. The model includes atmospheric Hg0 oxidation (by OH, O3, or bromine), surface snow HgII (oxidized mercury) reduction, and air–snow exchange, and is driven by meteorological fields from a regional climate model. The simulations suggest that a photochemically driven mercury diurnal cycle occurs at the air–snow interface in austral summer. The fast oxidation of Hg0 in summer may be provided by a two-step bromine-initiated scheme, which is favored by low temperature and high nitrogen oxides at Concordia. The summertime diurnal variations of Hg0 (peaking during daytime) may be confined within several tens of meters above the snow surface and affected by changing mixed layer depths. Snow re-emission of Hg0 is mainly driven by photoreduction of snow HgII in summer. Intermittent warming events and a hypothesized reduction of HgII occurring in snow in the dark may be important processes controlling the mercury variations in the non-summer period, although their relative importance is uncertain. The Br-initiated oxidation of Hg0 is expected to be slower at Summit Station in Greenland than at Concordia (due to their difference in temperature and levels of nitrogen oxides and ozone), which may contribute to the observed differences in the summertime diurnal variations of Hg0 between these two polar inland stations. Article in Journal/Newspaper Antarc* Antarctic Greenland Niedersächsisches Online-Archiv NOA Antarctic Austral Greenland Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) Atmospheric Chemistry and Physics 18 21 15825 15840 |
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Niedersächsisches Online-Archiv NOA |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Song, Shaojie Angot, Hélène Selin, Noelle E. Gallée, Hubert Sprovieri, Francesca Pirrone, Nicola Helmig, Detlev Savarino, Joël Magand, Olivier Dommergue, Aurélien Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
topic_facet |
article Verlagsveröffentlichung |
description |
Distinct diurnal and seasonal variations of mercury (Hg) have been observed in near-surface air at Concordia Station on the East Antarctic Plateau, but the processes controlling these characteristics are not well understood. Here, we use a box model to interpret the Hg0 (gaseous elemental mercury) measurements in thes year 2013. The model includes atmospheric Hg0 oxidation (by OH, O3, or bromine), surface snow HgII (oxidized mercury) reduction, and air–snow exchange, and is driven by meteorological fields from a regional climate model. The simulations suggest that a photochemically driven mercury diurnal cycle occurs at the air–snow interface in austral summer. The fast oxidation of Hg0 in summer may be provided by a two-step bromine-initiated scheme, which is favored by low temperature and high nitrogen oxides at Concordia. The summertime diurnal variations of Hg0 (peaking during daytime) may be confined within several tens of meters above the snow surface and affected by changing mixed layer depths. Snow re-emission of Hg0 is mainly driven by photoreduction of snow HgII in summer. Intermittent warming events and a hypothesized reduction of HgII occurring in snow in the dark may be important processes controlling the mercury variations in the non-summer period, although their relative importance is uncertain. The Br-initiated oxidation of Hg0 is expected to be slower at Summit Station in Greenland than at Concordia (due to their difference in temperature and levels of nitrogen oxides and ozone), which may contribute to the observed differences in the summertime diurnal variations of Hg0 between these two polar inland stations. |
format |
Article in Journal/Newspaper |
author |
Song, Shaojie Angot, Hélène Selin, Noelle E. Gallée, Hubert Sprovieri, Francesca Pirrone, Nicola Helmig, Detlev Savarino, Joël Magand, Olivier Dommergue, Aurélien |
author_facet |
Song, Shaojie Angot, Hélène Selin, Noelle E. Gallée, Hubert Sprovieri, Francesca Pirrone, Nicola Helmig, Detlev Savarino, Joël Magand, Olivier Dommergue, Aurélien |
author_sort |
Song, Shaojie |
title |
Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
title_short |
Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
title_full |
Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
title_fullStr |
Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
title_full_unstemmed |
Understanding mercury oxidation and air–snow exchange on the East Antarctic Plateau: a modeling study |
title_sort |
understanding mercury oxidation and air–snow exchange on the east antarctic plateau: a modeling study |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-15825-2018 https://noa.gwlb.de/receive/cop_mods_00041391 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041011/acp-18-15825-2018.pdf https://acp.copernicus.org/articles/18/15825/2018/acp-18-15825-2018.pdf |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Antarctic Austral Greenland Concordia Station |
geographic_facet |
Antarctic Austral Greenland Concordia Station |
genre |
Antarc* Antarctic Greenland |
genre_facet |
Antarc* Antarctic Greenland |
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-18-15825-2018 https://noa.gwlb.de/receive/cop_mods_00041391 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041011/acp-18-15825-2018.pdf https://acp.copernicus.org/articles/18/15825/2018/acp-18-15825-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-18-15825-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
21 |
container_start_page |
15825 |
op_container_end_page |
15840 |
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1766272864936263680 |