Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector
Diatom assemblages in marine cores and sea salt deposition fluxes in ice cores have been used as sea ice proxies in the southern hemisphere. Here, a marine and an ice core proxy record for the Indian Ocean covering the last two glacial cycles are compared in order to illustrate their potential and l...
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ftnerc:oai:nora.nerc.ac.uk:10549 2023-05-15T13:45:10+02:00 Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector Röthlisberger, Regine Crosta, Xavier Abram, Nerilie J. Armand, Leanne Wolff, Eric W. 2010 http://nora.nerc.ac.uk/id/eprint/10549/ https://doi.org/10.1016/j.quascirev.2009.10.005 unknown Pergamon-Elsevier Röthlisberger, Regine; Crosta, Xavier; Abram, Nerilie J.; Armand, Leanne; Wolff, Eric W. 2010 Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector. Quaternary Science Reviews, 29 (1-2). 296-302. https://doi.org/10.1016/j.quascirev.2009.10.005 <https://doi.org/10.1016/j.quascirev.2009.10.005> Glaciology Biology and Microbiology Chemistry Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1016/j.quascirev.2009.10.005 2023-02-04T19:26:45Z Diatom assemblages in marine cores and sea salt deposition fluxes in ice cores have been used as sea ice proxies in the southern hemisphere. Here, a marine and an ice core proxy record for the Indian Ocean covering the last two glacial cycles are compared in order to illustrate their potential and limitations. The marine core was extracted in a location completely ice free under present-day conditions, and therefore was unable to record changes to the recent sea ice extent. Similarly, no sea ice was recorded at that location during the previous interglacial period. During the last glacial period, however, the site was seasonally covered by sea ice, and the diatom assemblages allowed an estimation of average seasonal sea ice presence. The ice core data originated from the East Antarctic plateau. The marine sodium present in the ice core was used as a proxy of the sea-ice coverage and, on average, a larger sea ice surface led to an increased sea-salt aerosol flux, seen e.g. at the last glacial inception. However, the response of the sea salt flux to increasing sea ice extent diminished during peak glacial conditions when only minimal variability was recorded in the ice core record. A first-order approximation is used to take this non-linear response of the ice core sea ice proxy into account. Based on the ice core proxy record, sea ice extent was reduced considerably during the warm episodes of the previous two interglacial periods compared to modern sea ice extent, in particular during the peak warmth of the Last Interglacial. The ice core proxy also showed a very strong precessional variability (pronounced spectral peak at 23 ka period) over the past 240 ka. The advantage of combining the two proxy records lies in the complementary nature of their response. While the ice core proxy showed limited sensitivity during full glacial conditions, the marine proxy recorded the seasonal sea-ice coverage. Once the sea ice retreated south of the location of the marine core, the ice core proxy responded to changes in sea ... Article in Journal/Newspaper Antarc* Antarctic ice core Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Indian Quaternary Science Reviews 29 1-2 296 302 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology Biology and Microbiology Chemistry |
spellingShingle |
Glaciology Biology and Microbiology Chemistry Röthlisberger, Regine Crosta, Xavier Abram, Nerilie J. Armand, Leanne Wolff, Eric W. Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
topic_facet |
Glaciology Biology and Microbiology Chemistry |
description |
Diatom assemblages in marine cores and sea salt deposition fluxes in ice cores have been used as sea ice proxies in the southern hemisphere. Here, a marine and an ice core proxy record for the Indian Ocean covering the last two glacial cycles are compared in order to illustrate their potential and limitations. The marine core was extracted in a location completely ice free under present-day conditions, and therefore was unable to record changes to the recent sea ice extent. Similarly, no sea ice was recorded at that location during the previous interglacial period. During the last glacial period, however, the site was seasonally covered by sea ice, and the diatom assemblages allowed an estimation of average seasonal sea ice presence. The ice core data originated from the East Antarctic plateau. The marine sodium present in the ice core was used as a proxy of the sea-ice coverage and, on average, a larger sea ice surface led to an increased sea-salt aerosol flux, seen e.g. at the last glacial inception. However, the response of the sea salt flux to increasing sea ice extent diminished during peak glacial conditions when only minimal variability was recorded in the ice core record. A first-order approximation is used to take this non-linear response of the ice core sea ice proxy into account. Based on the ice core proxy record, sea ice extent was reduced considerably during the warm episodes of the previous two interglacial periods compared to modern sea ice extent, in particular during the peak warmth of the Last Interglacial. The ice core proxy also showed a very strong precessional variability (pronounced spectral peak at 23 ka period) over the past 240 ka. The advantage of combining the two proxy records lies in the complementary nature of their response. While the ice core proxy showed limited sensitivity during full glacial conditions, the marine proxy recorded the seasonal sea-ice coverage. Once the sea ice retreated south of the location of the marine core, the ice core proxy responded to changes in sea ... |
format |
Article in Journal/Newspaper |
author |
Röthlisberger, Regine Crosta, Xavier Abram, Nerilie J. Armand, Leanne Wolff, Eric W. |
author_facet |
Röthlisberger, Regine Crosta, Xavier Abram, Nerilie J. Armand, Leanne Wolff, Eric W. |
author_sort |
Röthlisberger, Regine |
title |
Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
title_short |
Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
title_full |
Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
title_fullStr |
Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
title_full_unstemmed |
Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector |
title_sort |
potential and limitations of marine and ice core sea ice proxies: an example from the indian ocean sector |
publisher |
Pergamon-Elsevier |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/10549/ https://doi.org/10.1016/j.quascirev.2009.10.005 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic ice core Sea ice |
genre_facet |
Antarc* Antarctic ice core Sea ice |
op_relation |
Röthlisberger, Regine; Crosta, Xavier; Abram, Nerilie J.; Armand, Leanne; Wolff, Eric W. 2010 Potential and limitations of marine and ice core sea ice proxies: an example from the Indian Ocean sector. Quaternary Science Reviews, 29 (1-2). 296-302. https://doi.org/10.1016/j.quascirev.2009.10.005 <https://doi.org/10.1016/j.quascirev.2009.10.005> |
op_doi |
https://doi.org/10.1016/j.quascirev.2009.10.005 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
1-2 |
container_start_page |
296 |
op_container_end_page |
302 |
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1766214172440264704 |