Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception
We present downcore records of redox-sensitive authigenic uranium (U) and manganese (Mn) concentrations based on five marine sediment cores spanning a meridional transect encompassing the Subantarctic and Antarctic zones in the southwestern Indian Ocean covering the last glacial cycle. These records...
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2022
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Online Access: | https://doi.org/10.5194/cp-18-1797-2022 https://cp.copernicus.org/articles/18/1797/2022/cp-18-1797-2022.pdf https://doaj.org/article/21e2874b937e499f98367b2a54135a20 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:21e2874b937e499f98367b2a54135a20 2023-05-15T13:42:17+02:00 Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception H. E. Amsler L. M. Thöle I. Stimac W. Geibert M. Ikehara G. Kuhn O. Esper S. L. Jaccard 2022-08-01 https://doi.org/10.5194/cp-18-1797-2022 https://cp.copernicus.org/articles/18/1797/2022/cp-18-1797-2022.pdf https://doaj.org/article/21e2874b937e499f98367b2a54135a20 en eng Copernicus Publications doi:10.5194/cp-18-1797-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/1797/2022/cp-18-1797-2022.pdf https://doaj.org/article/21e2874b937e499f98367b2a54135a20 undefined Climate of the Past, Vol 18, Pp 1797-1813 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/cp-18-1797-2022 2023-01-22T19:11:10Z We present downcore records of redox-sensitive authigenic uranium (U) and manganese (Mn) concentrations based on five marine sediment cores spanning a meridional transect encompassing the Subantarctic and Antarctic zones in the southwestern Indian Ocean covering the last glacial cycle. These records signal lower bottom water oxygenation during glacial climate intervals and generally higher oxygenation during warm periods, consistent with climate-related changes in deep-ocean remineralized carbon storage. Regional changes in the export of siliceous phytoplankton to the deep sea may have entailed a secondary influence on oxygen levels at the water–sediment interface, especially in the Subantarctic Zone. The rapid reoxygenation during the deglaciation is in line with increased ventilation and enhanced upwelling after the Last Glacial Maximum (LGM), which in combination conspired to transfer previously sequestered remineralized carbon to the surface ocean and the atmosphere, contributing to propel the Earth's climate out of the last ice age. These records highlight the still insufficiently documented role that the Southern Indian Ocean played in the air–sea partitioning of CO2 on glacial–interglacial timescales. Article in Journal/Newspaper Antarc* Antarctic Unknown Antarctic Indian Climate of the Past 18 8 1797 1813 |
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English |
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geo envir H. E. Amsler L. M. Thöle I. Stimac W. Geibert M. Ikehara G. Kuhn O. Esper S. L. Jaccard Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
topic_facet |
geo envir |
description |
We present downcore records of redox-sensitive authigenic uranium (U) and manganese (Mn) concentrations based on five marine sediment cores spanning a meridional transect encompassing the Subantarctic and Antarctic zones in the southwestern Indian Ocean covering the last glacial cycle. These records signal lower bottom water oxygenation during glacial climate intervals and generally higher oxygenation during warm periods, consistent with climate-related changes in deep-ocean remineralized carbon storage. Regional changes in the export of siliceous phytoplankton to the deep sea may have entailed a secondary influence on oxygen levels at the water–sediment interface, especially in the Subantarctic Zone. The rapid reoxygenation during the deglaciation is in line with increased ventilation and enhanced upwelling after the Last Glacial Maximum (LGM), which in combination conspired to transfer previously sequestered remineralized carbon to the surface ocean and the atmosphere, contributing to propel the Earth's climate out of the last ice age. These records highlight the still insufficiently documented role that the Southern Indian Ocean played in the air–sea partitioning of CO2 on glacial–interglacial timescales. |
format |
Article in Journal/Newspaper |
author |
H. E. Amsler L. M. Thöle I. Stimac W. Geibert M. Ikehara G. Kuhn O. Esper S. L. Jaccard |
author_facet |
H. E. Amsler L. M. Thöle I. Stimac W. Geibert M. Ikehara G. Kuhn O. Esper S. L. Jaccard |
author_sort |
H. E. Amsler |
title |
Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
title_short |
Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
title_full |
Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
title_fullStr |
Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
title_full_unstemmed |
Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
title_sort |
bottom water oxygenation changes in the southwestern indian ocean as an indicator for enhanced respired carbon storage since the last glacial inception |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-1797-2022 https://cp.copernicus.org/articles/18/1797/2022/cp-18-1797-2022.pdf https://doaj.org/article/21e2874b937e499f98367b2a54135a20 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Climate of the Past, Vol 18, Pp 1797-1813 (2022) |
op_relation |
doi:10.5194/cp-18-1797-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/1797/2022/cp-18-1797-2022.pdf https://doaj.org/article/21e2874b937e499f98367b2a54135a20 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-18-1797-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
8 |
container_start_page |
1797 |
op_container_end_page |
1813 |
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1766166065841176576 |