Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core
Chloride (Cl−) and sodium (Na+) in ice cores originate mainly from sea salt, and one would thus expect the Cl−/Na+ ratio to reflect the seawater ratio. However, at Dome C, a low-accumulation site in East Antarctica, this is not the case in present-day snow. Instead, a Cl− excess relative to Na+ is o...
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ftunivbern:oai:boris.unibe.ch:158297 2023-08-20T04:00:55+02:00 Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core Röthlisberger, R. Mulvaney, Robert Wolff, Eric W. Hutterli, Manuel A. Bigler, Matthias de Angelis, Martine Hansson, Margareta E. Steffensen, Jørgen P. Udisti, Roberto 2003 application/pdf https://boris.unibe.ch/158297/1/roethlisberger03jgr.pdf https://boris.unibe.ch/158297/ eng eng American Geophysical Union https://boris.unibe.ch/158297/ info:eu-repo/semantics/openAccess Röthlisberger, R.; Mulvaney, Robert; Wolff, Eric W.; Hutterli, Manuel A.; Bigler, Matthias; de Angelis, Martine; Hansson, Margareta E.; Steffensen, Jørgen P.; Udisti, Roberto (2003). Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core. Journal of Geophysical Research: Atmospheres, 108(D16), pp. 1-6. American Geophysical Union 10.1029/2003JD003604 <http://dx.doi.org/10.1029/2003JD003604> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2003 ftunivbern https://doi.org/10.1029/2003JD003604 2023-07-31T22:08:01Z Chloride (Cl−) and sodium (Na+) in ice cores originate mainly from sea salt, and one would thus expect the Cl−/Na+ ratio to reflect the seawater ratio. However, at Dome C, a low-accumulation site in East Antarctica, this is not the case in present-day snow. Instead, a Cl− excess relative to Na+ is observed in surface snow, and within a few meters depth the Cl− concentration decreases, and the Cl−/Na+ ratio becomes significantly lower than the seawater ratio. Aerosol studies at coastal Antarctic sites have shown that the reaction of sea-salt aerosols with nitric and sulphuric acid leads to the formation of HCl that eventually escapes the sea-salt aerosol. The observed decrease in Cl− concentrations in the uppermost snow layers is due to reemission of HCl from the snow. Postdepositional loss of HCl depends among other factors on the accumulation rate at the site, with lower accumulation rates leading to larger losses. During the Last Glacial Maximum (LGM) the Cl−/Na+ ratio is relatively stable and close to the seawater ratio, despite the even lower accumulation rate during that time. The likely explanation for this conflicting observation is that high levels of dust neutralized nitric and sulphuric acids during the LGM which in turn reduced the formation of HCl from sea-salt aerosol. With less or no HCl formed, postdepositional loss would be prevented, keeping the Cl−/Na+ ratio close to that of sea water. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core BORIS (Bern Open Repository and Information System, University of Bern) Antarctic East Antarctica Journal of Geophysical Research 108 D16 |
institution |
Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Röthlisberger, R. Mulvaney, Robert Wolff, Eric W. Hutterli, Manuel A. Bigler, Matthias de Angelis, Martine Hansson, Margareta E. Steffensen, Jørgen P. Udisti, Roberto Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
topic_facet |
530 Physics |
description |
Chloride (Cl−) and sodium (Na+) in ice cores originate mainly from sea salt, and one would thus expect the Cl−/Na+ ratio to reflect the seawater ratio. However, at Dome C, a low-accumulation site in East Antarctica, this is not the case in present-day snow. Instead, a Cl− excess relative to Na+ is observed in surface snow, and within a few meters depth the Cl− concentration decreases, and the Cl−/Na+ ratio becomes significantly lower than the seawater ratio. Aerosol studies at coastal Antarctic sites have shown that the reaction of sea-salt aerosols with nitric and sulphuric acid leads to the formation of HCl that eventually escapes the sea-salt aerosol. The observed decrease in Cl− concentrations in the uppermost snow layers is due to reemission of HCl from the snow. Postdepositional loss of HCl depends among other factors on the accumulation rate at the site, with lower accumulation rates leading to larger losses. During the Last Glacial Maximum (LGM) the Cl−/Na+ ratio is relatively stable and close to the seawater ratio, despite the even lower accumulation rate during that time. The likely explanation for this conflicting observation is that high levels of dust neutralized nitric and sulphuric acids during the LGM which in turn reduced the formation of HCl from sea-salt aerosol. With less or no HCl formed, postdepositional loss would be prevented, keeping the Cl−/Na+ ratio close to that of sea water. |
format |
Article in Journal/Newspaper |
author |
Röthlisberger, R. Mulvaney, Robert Wolff, Eric W. Hutterli, Manuel A. Bigler, Matthias de Angelis, Martine Hansson, Margareta E. Steffensen, Jørgen P. Udisti, Roberto |
author_facet |
Röthlisberger, R. Mulvaney, Robert Wolff, Eric W. Hutterli, Manuel A. Bigler, Matthias de Angelis, Martine Hansson, Margareta E. Steffensen, Jørgen P. Udisti, Roberto |
author_sort |
Röthlisberger, R. |
title |
Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
title_short |
Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
title_full |
Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
title_fullStr |
Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
title_full_unstemmed |
Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core |
title_sort |
limited dechlorination of sea-salt aerosols during the last glacial period: evidence from the european project for ice coring in antarctica (epica) dome c ice core |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
https://boris.unibe.ch/158297/1/roethlisberger03jgr.pdf https://boris.unibe.ch/158297/ |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
op_source |
Röthlisberger, R.; Mulvaney, Robert; Wolff, Eric W.; Hutterli, Manuel A.; Bigler, Matthias; de Angelis, Martine; Hansson, Margareta E.; Steffensen, Jørgen P.; Udisti, Roberto (2003). Limited dechlorination of sea-salt aerosols during the last glacial period: Evidence from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core. Journal of Geophysical Research: Atmospheres, 108(D16), pp. 1-6. American Geophysical Union 10.1029/2003JD003604 <http://dx.doi.org/10.1029/2003JD003604> |
op_relation |
https://boris.unibe.ch/158297/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2003JD003604 |
container_title |
Journal of Geophysical Research |
container_volume |
108 |
container_issue |
D16 |
_version_ |
1774721304692260864 |