Migration of the Antarctic Polar Front over the last glacial cycle
The Southern Hemisphere Westerly Winds (SWW) drive upwelling south of the Antarctic Polar Front (PF) that vents CO2 to the atmosphere. During the ice ages, a northward (equatorward) shift of the PF may have reduced this CO2 venting, helping to explain the lower atmospheric CO2 concentration of those...
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ftarchimer:oai:archimer.ifremer.fr:95938 2023-12-31T09:59:36+01:00 Migration of the Antarctic Polar Front over the last glacial cycle Thöle, Lena Ai, Xuyuan Auderset, Alexandra Schmitt, Mareike Moretti, Simone Studer, Anja Michel, Elisabeth Wegmann, Martin Mazaud, Alain Bijl, Peter Sigman, Daniel Martinez-garcia, Alfredo Jaccard, Samuel L. 2022-03-08 application/pdf https://archimer.ifremer.fr/doc/00847/95938/103885.pdf https://doi.org/10.21203/rs.3.rs-1364006/v1 https://archimer.ifremer.fr/doc/00847/95938/ eng eng Research Square Platform LLC https://archimer.ifremer.fr/doc/00847/95938/103885.pdf doi:10.21203/rs.3.rs-1364006/v1 https://archimer.ifremer.fr/doc/00847/95938/ info:eu-repo/semantics/openAccess restricted use Research Square. (Research Square Platform LLC), 2022-03-08 , N. Version 1 Paleoceanography glacial–interglacial changes Southern Ocean ACC atmospheric CO2 text Article info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.21203/rs.3.rs-1364006/v1 2023-12-05T23:51:08Z The Southern Hemisphere Westerly Winds (SWW) drive upwelling south of the Antarctic Polar Front (PF) that vents CO2 to the atmosphere. During the ice ages, a northward (equatorward) shift of the PF may have reduced this CO2 venting, helping to explain the lower atmospheric CO2 concentration of those times. However, evidence of PF migration is lacking. Here, we report biomarker–based sea surface temperature (SST) reconstructions from two marine sediment cores at different latitudes in the Southern Indian Ocean across the last glacial cycle. Using a quantitative framework for the effect of the PF on meridional SST gradient, we show that the PF underwent an equatorward shift during the ice ages. The PF latitude reconstruction, when compared with other data, also suggests a role for Earth’s axial tilt in the strength and latitude range of SWW-driven upwelling, which may explain previously noted deviations in atmospheric CO2 from a simple correlation with Antarctic climate. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Paleoceanography glacial–interglacial changes Southern Ocean ACC atmospheric CO2 |
spellingShingle |
Paleoceanography glacial–interglacial changes Southern Ocean ACC atmospheric CO2 Thöle, Lena Ai, Xuyuan Auderset, Alexandra Schmitt, Mareike Moretti, Simone Studer, Anja Michel, Elisabeth Wegmann, Martin Mazaud, Alain Bijl, Peter Sigman, Daniel Martinez-garcia, Alfredo Jaccard, Samuel L. Migration of the Antarctic Polar Front over the last glacial cycle |
topic_facet |
Paleoceanography glacial–interglacial changes Southern Ocean ACC atmospheric CO2 |
description |
The Southern Hemisphere Westerly Winds (SWW) drive upwelling south of the Antarctic Polar Front (PF) that vents CO2 to the atmosphere. During the ice ages, a northward (equatorward) shift of the PF may have reduced this CO2 venting, helping to explain the lower atmospheric CO2 concentration of those times. However, evidence of PF migration is lacking. Here, we report biomarker–based sea surface temperature (SST) reconstructions from two marine sediment cores at different latitudes in the Southern Indian Ocean across the last glacial cycle. Using a quantitative framework for the effect of the PF on meridional SST gradient, we show that the PF underwent an equatorward shift during the ice ages. The PF latitude reconstruction, when compared with other data, also suggests a role for Earth’s axial tilt in the strength and latitude range of SWW-driven upwelling, which may explain previously noted deviations in atmospheric CO2 from a simple correlation with Antarctic climate. |
format |
Article in Journal/Newspaper |
author |
Thöle, Lena Ai, Xuyuan Auderset, Alexandra Schmitt, Mareike Moretti, Simone Studer, Anja Michel, Elisabeth Wegmann, Martin Mazaud, Alain Bijl, Peter Sigman, Daniel Martinez-garcia, Alfredo Jaccard, Samuel L. |
author_facet |
Thöle, Lena Ai, Xuyuan Auderset, Alexandra Schmitt, Mareike Moretti, Simone Studer, Anja Michel, Elisabeth Wegmann, Martin Mazaud, Alain Bijl, Peter Sigman, Daniel Martinez-garcia, Alfredo Jaccard, Samuel L. |
author_sort |
Thöle, Lena |
title |
Migration of the Antarctic Polar Front over the last glacial cycle |
title_short |
Migration of the Antarctic Polar Front over the last glacial cycle |
title_full |
Migration of the Antarctic Polar Front over the last glacial cycle |
title_fullStr |
Migration of the Antarctic Polar Front over the last glacial cycle |
title_full_unstemmed |
Migration of the Antarctic Polar Front over the last glacial cycle |
title_sort |
migration of the antarctic polar front over the last glacial cycle |
publisher |
Research Square Platform LLC |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00847/95938/103885.pdf https://doi.org/10.21203/rs.3.rs-1364006/v1 https://archimer.ifremer.fr/doc/00847/95938/ |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Research Square. (Research Square Platform LLC), 2022-03-08 , N. Version 1 |
op_relation |
https://archimer.ifremer.fr/doc/00847/95938/103885.pdf doi:10.21203/rs.3.rs-1364006/v1 https://archimer.ifremer.fr/doc/00847/95938/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.21203/rs.3.rs-1364006/v1 |
_version_ |
1786840012066652160 |