Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q09007, doi:10.1029/2011GC003691. Major deepwate...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4812 2023-05-15T13:53:14+02:00 Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination Hendry, Katharine R. Rickaby, Rosalind E. M. Allen, Claire S. 2011-09-16 application/pdf image/jpeg text/plain https://hdl.handle.net/1912/4812 en_US eng American Geophysical Union https://doi.org/10.1029/2011GC003691 Geochemistry Geophysics Geosystems 12 (2011): Q09007 https://hdl.handle.net/1912/4812 doi:10.1029/2011GC003691 Geochemistry Geophysics Geosystems 12 (2011): Q09007 doi:10.1029/2011GC003691 Deglaciation Diatom opal Westerlies Zinc Article 2011 ftwhoas https://doi.org/10.1029/2011GC003691 2022-05-28T22:58:27Z Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q09007, doi:10.1029/2011GC003691. Major deepwater masses upwell and reach the surface in the Southern Ocean, forming an important conduit supplying nutrients and micronutrients to the surface and playing a key role in the regulation of global climate through ocean-atmosphere gas exchange. Here, we reconstruct changes in micronutrient distribution in this region in response to past changes in upwelling, oceanic mixing, and sea-ice seasonality. We present two downcore (Zn/Si)opal records from the Scotia Sea and Drake Passage region, which we interpret in the context of micronutrient distribution in the Atlantic sector of the Southern Ocean over the last glacial termination. Previous work shows that micronutrient availability in the surface waters in the South Atlantic appear to be controlled dominantly by upwelling and mixing of micronutrient rich deepwaters, which are additionally fuelled by the terrestrial sediment sources of the Scotia Arc and South Georgia. This is supported by our reconstructions, which show micronutrient availability to the west of the Scotia Arc and South Georgia are consistently lower than to the east over the last glacial termination due to downstream transport and mixing into surface waters of continentally derived material in the Antarctic Circumpolar Current. Micronutrient availability in this region was at a minimum from 20 to 25 ky BP, coinciding with maximum sea-ice coverage, and increased due to an expansion of the seasonal sea-ice zone and increased mixing of subsurface waters. Our findings are consistent with largely diminished upwelling of micronutrients during the maximum glacial extent, and reduced mixing due to the presence of persistent sea-ice. During the deglacial there was an increase in micronutrient availability, as well ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean The Antarctic Drake Passage Scotia Sea Geochemistry, Geophysics, Geosystems 12 9 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Deglaciation Diatom opal Westerlies Zinc |
spellingShingle |
Deglaciation Diatom opal Westerlies Zinc Hendry, Katharine R. Rickaby, Rosalind E. M. Allen, Claire S. Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
topic_facet |
Deglaciation Diatom opal Westerlies Zinc |
description |
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q09007, doi:10.1029/2011GC003691. Major deepwater masses upwell and reach the surface in the Southern Ocean, forming an important conduit supplying nutrients and micronutrients to the surface and playing a key role in the regulation of global climate through ocean-atmosphere gas exchange. Here, we reconstruct changes in micronutrient distribution in this region in response to past changes in upwelling, oceanic mixing, and sea-ice seasonality. We present two downcore (Zn/Si)opal records from the Scotia Sea and Drake Passage region, which we interpret in the context of micronutrient distribution in the Atlantic sector of the Southern Ocean over the last glacial termination. Previous work shows that micronutrient availability in the surface waters in the South Atlantic appear to be controlled dominantly by upwelling and mixing of micronutrient rich deepwaters, which are additionally fuelled by the terrestrial sediment sources of the Scotia Arc and South Georgia. This is supported by our reconstructions, which show micronutrient availability to the west of the Scotia Arc and South Georgia are consistently lower than to the east over the last glacial termination due to downstream transport and mixing into surface waters of continentally derived material in the Antarctic Circumpolar Current. Micronutrient availability in this region was at a minimum from 20 to 25 ky BP, coinciding with maximum sea-ice coverage, and increased due to an expansion of the seasonal sea-ice zone and increased mixing of subsurface waters. Our findings are consistent with largely diminished upwelling of micronutrients during the maximum glacial extent, and reduced mixing due to the presence of persistent sea-ice. During the deglacial there was an increase in micronutrient availability, as well ... |
format |
Article in Journal/Newspaper |
author |
Hendry, Katharine R. Rickaby, Rosalind E. M. Allen, Claire S. |
author_facet |
Hendry, Katharine R. Rickaby, Rosalind E. M. Allen, Claire S. |
author_sort |
Hendry, Katharine R. |
title |
Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
title_short |
Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
title_full |
Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
title_fullStr |
Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
title_full_unstemmed |
Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination |
title_sort |
changes in micronutrient supply to the surface southern ocean (atlantic sector) across the glacial termination |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://hdl.handle.net/1912/4812 |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage Scotia Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage Scotia Sea |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean |
op_source |
Geochemistry Geophysics Geosystems 12 (2011): Q09007 doi:10.1029/2011GC003691 |
op_relation |
https://doi.org/10.1029/2011GC003691 Geochemistry Geophysics Geosystems 12 (2011): Q09007 https://hdl.handle.net/1912/4812 doi:10.1029/2011GC003691 |
op_doi |
https://doi.org/10.1029/2011GC003691 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
12 |
container_issue |
9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766258235294089216 |