Halogen species record Antarctic sea ice extent over glacial–interglacial periods
Sea ice is an integral part of the earth's climate system because it affects planetary albedo, sea-surface salinity, and the atmosphere–ocean exchange of reactive gases and aerosols. Bromine and iodine chemistry is active at polar sea ice margins with the occurrence of bromine explosions and th...
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Online Access: | https://doi.org/10.5194/acp-13-6623-2013 https://doaj.org/article/9d6c353ee2ae4e449ae3e27edb703373 |
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ftdoajarticles:oai:doaj.org/article:9d6c353ee2ae4e449ae3e27edb703373 2023-05-15T13:49:07+02:00 Halogen species record Antarctic sea ice extent over glacial–interglacial periods A. Spolaor P. Vallelonga J. M. C. Plane N. Kehrwald J. Gabrieli C. Varin C. Turetta G. Cozzi R. Kumar C. Boutron C. Barbante 2013-07-01T00:00:00Z https://doi.org/10.5194/acp-13-6623-2013 https://doaj.org/article/9d6c353ee2ae4e449ae3e27edb703373 EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/6623/2013/acp-13-6623-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-6623-2013 1680-7316 1680-7324 https://doaj.org/article/9d6c353ee2ae4e449ae3e27edb703373 Atmospheric Chemistry and Physics, Vol 13, Iss 13, Pp 6623-6635 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-6623-2013 2022-12-31T03:30:44Z Sea ice is an integral part of the earth's climate system because it affects planetary albedo, sea-surface salinity, and the atmosphere–ocean exchange of reactive gases and aerosols. Bromine and iodine chemistry is active at polar sea ice margins with the occurrence of bromine explosions and the biological production of organoiodine from sea ice algae. Satellite measurements demonstrate that concentrations of bromine oxide (BrO) and iodine oxide (IO) decrease over sea ice toward the Antarctic interior. Here we present speciation measurements of bromine and iodine in the TALDICE (TALos Dome Ice CorE) ice core (159°11' E, 72°49' S; 2315 m a.s.l.) spanning the last 215 ky. The Talos Dome ice core is located 250 km inland and is sensitive to marine air masses intruding onto the Antarctic Plateau. Talos Dome bromide (Br − ) is positively correlated with temperature and negatively correlated with sodium (Na). Based on the Br − /Na seawater ratio, bromide is depleted in the ice during glacial periods and enriched during interglacial periods. Total iodine, consisting of iodide (I − ) and iodate (IO 3 − ), peaks during glacials with lower values during interglacial periods. Although IO 3 − is considered the most stable iodine species in the atmosphere it was only observed in the TALDICE record during glacial maxima. Sea ice dynamics are arguably the primary driver of halogen fluxes over glacial–interglacial timescales, by altering the distance between the sea ice edge and the Antarctic plateau and by altering the surface area of sea ice available to algal colonization. Based on our results we propose the use of both halogens for examining Antarctic variability of past sea ice extent. Article in Journal/Newspaper Antarc* Antarctic ice algae ice core Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Atmospheric Chemistry and Physics 13 13 6623 6635 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 A. Spolaor P. Vallelonga J. M. C. Plane N. Kehrwald J. Gabrieli C. Varin C. Turetta G. Cozzi R. Kumar C. Boutron C. Barbante Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Sea ice is an integral part of the earth's climate system because it affects planetary albedo, sea-surface salinity, and the atmosphere–ocean exchange of reactive gases and aerosols. Bromine and iodine chemistry is active at polar sea ice margins with the occurrence of bromine explosions and the biological production of organoiodine from sea ice algae. Satellite measurements demonstrate that concentrations of bromine oxide (BrO) and iodine oxide (IO) decrease over sea ice toward the Antarctic interior. Here we present speciation measurements of bromine and iodine in the TALDICE (TALos Dome Ice CorE) ice core (159°11' E, 72°49' S; 2315 m a.s.l.) spanning the last 215 ky. The Talos Dome ice core is located 250 km inland and is sensitive to marine air masses intruding onto the Antarctic Plateau. Talos Dome bromide (Br − ) is positively correlated with temperature and negatively correlated with sodium (Na). Based on the Br − /Na seawater ratio, bromide is depleted in the ice during glacial periods and enriched during interglacial periods. Total iodine, consisting of iodide (I − ) and iodate (IO 3 − ), peaks during glacials with lower values during interglacial periods. Although IO 3 − is considered the most stable iodine species in the atmosphere it was only observed in the TALDICE record during glacial maxima. Sea ice dynamics are arguably the primary driver of halogen fluxes over glacial–interglacial timescales, by altering the distance between the sea ice edge and the Antarctic plateau and by altering the surface area of sea ice available to algal colonization. Based on our results we propose the use of both halogens for examining Antarctic variability of past sea ice extent. |
format |
Article in Journal/Newspaper |
author |
A. Spolaor P. Vallelonga J. M. C. Plane N. Kehrwald J. Gabrieli C. Varin C. Turetta G. Cozzi R. Kumar C. Boutron C. Barbante |
author_facet |
A. Spolaor P. Vallelonga J. M. C. Plane N. Kehrwald J. Gabrieli C. Varin C. Turetta G. Cozzi R. Kumar C. Boutron C. Barbante |
author_sort |
A. Spolaor |
title |
Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
title_short |
Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
title_full |
Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
title_fullStr |
Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
title_full_unstemmed |
Halogen species record Antarctic sea ice extent over glacial–interglacial periods |
title_sort |
halogen species record antarctic sea ice extent over glacial–interglacial periods |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-6623-2013 https://doaj.org/article/9d6c353ee2ae4e449ae3e27edb703373 |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
Antarctic The Antarctic Talos Dome |
geographic_facet |
Antarctic The Antarctic Talos Dome |
genre |
Antarc* Antarctic ice algae ice core Sea ice |
genre_facet |
Antarc* Antarctic ice algae ice core Sea ice |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 13, Pp 6623-6635 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/6623/2013/acp-13-6623-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-6623-2013 1680-7316 1680-7324 https://doaj.org/article/9d6c353ee2ae4e449ae3e27edb703373 |
op_doi |
https://doi.org/10.5194/acp-13-6623-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
13 |
container_start_page |
6623 |
op_container_end_page |
6635 |
_version_ |
1766250836843823104 |