Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes
Paleorecords and modeling studies suggest that instabilities in the Atlantic Meridional Overturning Circulation (AMOC) strongly affect the low-latitude climate, namely via feedbacks on the Atlantic Intertropical Convergence Zone (ITCZ). Despite the pronounced millennial-scale overturning and climati...
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Copernicus Gesellschaft Mbh
2018
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ftarchimer:oai:archimer.ifremer.fr:60691 2023-05-15T17:33:05+02:00 Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes Zhuravleva, Anastasia Bauch, Henning A. 2018-10 application/pdf https://archimer.ifremer.fr/doc/00495/60691/65431.pdf https://archimer.ifremer.fr/doc/00495/60691/65432.pdf https://doi.org/10.5194/cp-14-1361-2018 https://archimer.ifremer.fr/doc/00495/60691/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00495/60691/65431.pdf https://archimer.ifremer.fr/doc/00495/60691/65432.pdf doi:10.5194/cp-14-1361-2018 https://archimer.ifremer.fr/doc/00495/60691/ info:eu-repo/semantics/openAccess restricted use Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2018-10 , Vol. 14 , N. 10 , P. 1361-1375 text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.5194/cp-14-1361-2018 2021-09-23T20:32:41Z Paleorecords and modeling studies suggest that instabilities in the Atlantic Meridional Overturning Circulation (AMOC) strongly affect the low-latitude climate, namely via feedbacks on the Atlantic Intertropical Convergence Zone (ITCZ). Despite the pronounced millennial-scale overturning and climatic variability documented in the subpolar North Atlantic during the last interglacial period (MIS 5e), studies on cross-latitudinal teleconnections remain very limited. This precludes a full understanding of the mechanisms controlling subtropical climate evolution across the last warm cycle. Here, we present new planktic foraminiferal assemblage data combined with delta O-18 values in surface and thermocline-dwelling foraminifera from the Bahamas, a region ideally suited to studying past changes in the subtropical ocean and atmosphere. Our data reveal that the peak sea surface warmth during early MIS 5e was intersected by an abrupt millennial-scale cooling/salinification event, which was possibly associated with a sudden southward displacement of the mean annual ITCZ position. This atmospheric shift is, in turn, ascribed to the transitional climatic regime of early MIS 5e, which was characterized by persistent ocean freshening in the high latitudes and an unstable AMOC mode. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Climate of the Past 14 10 1361 1375 |
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 |
description |
Paleorecords and modeling studies suggest that instabilities in the Atlantic Meridional Overturning Circulation (AMOC) strongly affect the low-latitude climate, namely via feedbacks on the Atlantic Intertropical Convergence Zone (ITCZ). Despite the pronounced millennial-scale overturning and climatic variability documented in the subpolar North Atlantic during the last interglacial period (MIS 5e), studies on cross-latitudinal teleconnections remain very limited. This precludes a full understanding of the mechanisms controlling subtropical climate evolution across the last warm cycle. Here, we present new planktic foraminiferal assemblage data combined with delta O-18 values in surface and thermocline-dwelling foraminifera from the Bahamas, a region ideally suited to studying past changes in the subtropical ocean and atmosphere. Our data reveal that the peak sea surface warmth during early MIS 5e was intersected by an abrupt millennial-scale cooling/salinification event, which was possibly associated with a sudden southward displacement of the mean annual ITCZ position. This atmospheric shift is, in turn, ascribed to the transitional climatic regime of early MIS 5e, which was characterized by persistent ocean freshening in the high latitudes and an unstable AMOC mode. |
format |
Article in Journal/Newspaper |
author |
Zhuravleva, Anastasia Bauch, Henning A. |
spellingShingle |
Zhuravleva, Anastasia Bauch, Henning A. Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
author_facet |
Zhuravleva, Anastasia Bauch, Henning A. |
author_sort |
Zhuravleva, Anastasia |
title |
Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
title_short |
Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
title_full |
Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
title_fullStr |
Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
title_full_unstemmed |
Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes |
title_sort |
last interglacial ocean changes in the bahamas: climate teleconnections between low and high latitudes |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00495/60691/65431.pdf https://archimer.ifremer.fr/doc/00495/60691/65432.pdf https://doi.org/10.5194/cp-14-1361-2018 https://archimer.ifremer.fr/doc/00495/60691/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2018-10 , Vol. 14 , N. 10 , P. 1361-1375 |
op_relation |
https://archimer.ifremer.fr/doc/00495/60691/65431.pdf https://archimer.ifremer.fr/doc/00495/60691/65432.pdf doi:10.5194/cp-14-1361-2018 https://archimer.ifremer.fr/doc/00495/60691/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/cp-14-1361-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
10 |
container_start_page |
1361 |
op_container_end_page |
1375 |
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1766131471173550080 |