Age determination of sediment cores from the southern South Atlantic
Two sediment sequences recovered close to, and south of, the present Polar Front (50°, 53°S) in the Atlantic sector of the Southern Ocean were analysed in order to evaluate the environmental evolution of the Southern Ocean surface over the last deglaciation and the Holocene. Our reconstruction is ba...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.712953 2023-05-15T13:42:09+02:00 Age determination of sediment cores from the southern South Atlantic Bianchi, Cristina Gersonde, Rainer MEDIAN LATITUDE: -51.667915 * MEDIAN LONGITUDE: 5.427750 * SOUTH-BOUND LATITUDE: -53.178330 * WEST-BOUND LONGITUDE: 5.133000 * NORTH-BOUND LATITUDE: -50.157500 * EAST-BOUND LONGITUDE: 5.722500 * DATE/TIME START: 1988-03-12T14:37:00 * DATE/TIME END: 1991-04-08T17:35:00 2004-02-19 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.712953 https://doi.org/10.1594/PANGAEA.712953 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.712953 https://doi.org/10.1594/PANGAEA.712953 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bianchi, Cristina; Gersonde, Rainer (2004): Climate evolution at the last deglacial: the role of the Southern Ocean. Earth and Planetary Science Letters, 228(3-4), 407-424, https://doi.org/10.1016/j.epsl.2004.10.003 ANT-IX/4 ANT-VI/3 Atlantic Indik Ridge AWI_Paleo KL Meteor Rise Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS12 PS12/557 PS1654-2 PS18 PS18/248 PS2090-1 Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.712953 https://doi.org/10.1016/j.epsl.2004.10.003 2023-01-20T07:31:23Z Two sediment sequences recovered close to, and south of, the present Polar Front (50°, 53°S) in the Atlantic sector of the Southern Ocean were analysed in order to evaluate the environmental evolution of the Southern Ocean surface over the last deglaciation and the Holocene. Our reconstruction is based on radiocarbon-dated records of diatom-based sea surface temperature and sea-ice proxies and planktic foraminiferal stable isotopes. The onset of the deglacial warming and gradual southward retreat of the winter sea-ice field between 18 and 17 cal kyr BP, occurrence of a thermal reversal centered at ca. 13 cal kyr BP (Antarctic Cold Reversal, or ACR), and early Holocene occurrence of the “climatic optimum” well correlate with climatic reconstructions available from the Indian Southern Ocean and from Antarctic ice cores. Time correspondence of Southern Ocean warming and Heinrich event 1 in the North Atlantic is compatible with the transmission of the climate signal from the Northern to the Southern Hemisphere through the “bipolar seesaw.” Our data support modeling results suggesting that the Northern Hemisphere Bølling warming and turn-on of the North Atlantic Deep Water formation are triggered by gradual warming and sea-ice retreat in the Southern Ocean. Meltwater shedding into the Southern Ocean associated with the ACR may maintain Northern Hemisphere warming during the Allerød. The development of sea surface warming and sea-ice retreat is compatible with a Southern Ocean control on the atmospheric CO2 increase during the deglaciation. During the early Holocene (9-7 cal kyr BP), our southern core records renewed surface ocean cooling and northward readvance of the winter sea-ice field. Such early Holocene cooling is common to cores from the high-latitude Atlantic sector, and might be brought about by expansion of the Weddell Gyre circulation at that time. Dataset Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian Southern Ocean Weddell ENVELOPE(5.133000,5.722500,-50.157500,-53.178330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-IX/4 ANT-VI/3 Atlantic Indik Ridge AWI_Paleo KL Meteor Rise Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS12 PS12/557 PS1654-2 PS18 PS18/248 PS2090-1 |
spellingShingle |
ANT-IX/4 ANT-VI/3 Atlantic Indik Ridge AWI_Paleo KL Meteor Rise Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS12 PS12/557 PS1654-2 PS18 PS18/248 PS2090-1 Bianchi, Cristina Gersonde, Rainer Age determination of sediment cores from the southern South Atlantic |
topic_facet |
ANT-IX/4 ANT-VI/3 Atlantic Indik Ridge AWI_Paleo KL Meteor Rise Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS12 PS12/557 PS1654-2 PS18 PS18/248 PS2090-1 |
description |
Two sediment sequences recovered close to, and south of, the present Polar Front (50°, 53°S) in the Atlantic sector of the Southern Ocean were analysed in order to evaluate the environmental evolution of the Southern Ocean surface over the last deglaciation and the Holocene. Our reconstruction is based on radiocarbon-dated records of diatom-based sea surface temperature and sea-ice proxies and planktic foraminiferal stable isotopes. The onset of the deglacial warming and gradual southward retreat of the winter sea-ice field between 18 and 17 cal kyr BP, occurrence of a thermal reversal centered at ca. 13 cal kyr BP (Antarctic Cold Reversal, or ACR), and early Holocene occurrence of the “climatic optimum” well correlate with climatic reconstructions available from the Indian Southern Ocean and from Antarctic ice cores. Time correspondence of Southern Ocean warming and Heinrich event 1 in the North Atlantic is compatible with the transmission of the climate signal from the Northern to the Southern Hemisphere through the “bipolar seesaw.” Our data support modeling results suggesting that the Northern Hemisphere Bølling warming and turn-on of the North Atlantic Deep Water formation are triggered by gradual warming and sea-ice retreat in the Southern Ocean. Meltwater shedding into the Southern Ocean associated with the ACR may maintain Northern Hemisphere warming during the Allerød. The development of sea surface warming and sea-ice retreat is compatible with a Southern Ocean control on the atmospheric CO2 increase during the deglaciation. During the early Holocene (9-7 cal kyr BP), our southern core records renewed surface ocean cooling and northward readvance of the winter sea-ice field. Such early Holocene cooling is common to cores from the high-latitude Atlantic sector, and might be brought about by expansion of the Weddell Gyre circulation at that time. |
format |
Dataset |
author |
Bianchi, Cristina Gersonde, Rainer |
author_facet |
Bianchi, Cristina Gersonde, Rainer |
author_sort |
Bianchi, Cristina |
title |
Age determination of sediment cores from the southern South Atlantic |
title_short |
Age determination of sediment cores from the southern South Atlantic |
title_full |
Age determination of sediment cores from the southern South Atlantic |
title_fullStr |
Age determination of sediment cores from the southern South Atlantic |
title_full_unstemmed |
Age determination of sediment cores from the southern South Atlantic |
title_sort |
age determination of sediment cores from the southern south atlantic |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.712953 https://doi.org/10.1594/PANGAEA.712953 |
op_coverage |
MEDIAN LATITUDE: -51.667915 * MEDIAN LONGITUDE: 5.427750 * SOUTH-BOUND LATITUDE: -53.178330 * WEST-BOUND LONGITUDE: 5.133000 * NORTH-BOUND LATITUDE: -50.157500 * EAST-BOUND LONGITUDE: 5.722500 * DATE/TIME START: 1988-03-12T14:37:00 * DATE/TIME END: 1991-04-08T17:35:00 |
long_lat |
ENVELOPE(5.133000,5.722500,-50.157500,-53.178330) |
geographic |
Antarctic Indian Southern Ocean Weddell |
geographic_facet |
Antarctic Indian Southern Ocean Weddell |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
op_source |
Supplement to: Bianchi, Cristina; Gersonde, Rainer (2004): Climate evolution at the last deglacial: the role of the Southern Ocean. Earth and Planetary Science Letters, 228(3-4), 407-424, https://doi.org/10.1016/j.epsl.2004.10.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.712953 https://doi.org/10.1594/PANGAEA.712953 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.712953 https://doi.org/10.1016/j.epsl.2004.10.003 |
_version_ |
1766163460063756288 |