Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11
Climate dynamics during the marine isotope stage (MIS) 11 interglacial may provide information about how the climate system will evolve under the conditions of low-amplitude orbital forcing that are also found during the late Holocene. New stable isotope and alkenone data are presented from southeas...
Published in: | Paleoceanography |
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2010
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Online Access: | https://hdl.handle.net/1983/2e41503d-3135-4e54-a362-0fef4aba24a2 https://research-information.bris.ac.uk/en/publications/2e41503d-3135-4e54-a362-0fef4aba24a2 https://doi.org/10.1029/2009PA001830 http://www.scopus.com/inward/record.url?scp=77955505737&partnerID=8YFLogxK |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/2e41503d-3135-4e54-a362-0fef4aba24a2 2024-01-28T10:06:32+01:00 Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 Dickson, Alexander J. Leng, Melanie J. Maslin, Mark A. Sloane, Hilary J. Green, Joanne Bendle, James A. McClymont, Erin L. Pancost, Richard D. 2010-08-17 https://hdl.handle.net/1983/2e41503d-3135-4e54-a362-0fef4aba24a2 https://research-information.bris.ac.uk/en/publications/2e41503d-3135-4e54-a362-0fef4aba24a2 https://doi.org/10.1029/2009PA001830 http://www.scopus.com/inward/record.url?scp=77955505737&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Dickson , A J , Leng , M J , Maslin , M A , Sloane , H J , Green , J , Bendle , J A , McClymont , E L & Pancost , R D 2010 , ' Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 ' , Paleoceanography , vol. 25 , no. 3 , PA3208 . https://doi.org/10.1029/2009PA001830 article 2010 ftubristolcris https://doi.org/10.1029/2009PA001830 2024-01-04T23:44:40Z Climate dynamics during the marine isotope stage (MIS) 11 interglacial may provide information about how the climate system will evolve under the conditions of low-amplitude orbital forcing that are also found during the late Holocene. New stable isotope and alkenone data are presented from southeast Atlantic Ocean Drilling Program Site 1085, providing detailed information on interglacial climate evolution and the impacts of Atlantic meridional overturning circulation (MOC) and Agulhas leakage on the regional upper ocean hydrography. The data suggest that although warm surface ocean conditions were maintained at approximate Holocene levels for 40,000 years during MIS 11, subsurface temperature and salinity recorded by deeper-dwelling planktonic foraminifera species were maintained at their highest values for only 7000-8000 years. Surface water temperature and salinity data suggest that the interocean exchange of warm, salty waters into the southeast Atlantic Ocean was directly related to changes in the activity of the MOC during the study interval. Specifically, transient regional warming events during periods of weakened overturning circulation may have been amplified by the continuous interocean exchange of warm, salty Indian Ocean waters that primed the MOC for abrupt resumptions into a vigorous mode of operation. Conversely, a peak in interocean exchange at the end of the MIS 11 interglacial optimum may reflect enhanced trade wind forcing of surface waters whose export to the North Atlantic Ocean could have contributed to renewed ice sheet buildup during the MIS 11 to 10 glacial inception. Article in Journal/Newspaper Ice Sheet North Atlantic Planktonic foraminifera University of Bristol: Bristol Research Indian Paleoceanography 25 3 |
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Open Polar |
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University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Climate dynamics during the marine isotope stage (MIS) 11 interglacial may provide information about how the climate system will evolve under the conditions of low-amplitude orbital forcing that are also found during the late Holocene. New stable isotope and alkenone data are presented from southeast Atlantic Ocean Drilling Program Site 1085, providing detailed information on interglacial climate evolution and the impacts of Atlantic meridional overturning circulation (MOC) and Agulhas leakage on the regional upper ocean hydrography. The data suggest that although warm surface ocean conditions were maintained at approximate Holocene levels for 40,000 years during MIS 11, subsurface temperature and salinity recorded by deeper-dwelling planktonic foraminifera species were maintained at their highest values for only 7000-8000 years. Surface water temperature and salinity data suggest that the interocean exchange of warm, salty waters into the southeast Atlantic Ocean was directly related to changes in the activity of the MOC during the study interval. Specifically, transient regional warming events during periods of weakened overturning circulation may have been amplified by the continuous interocean exchange of warm, salty Indian Ocean waters that primed the MOC for abrupt resumptions into a vigorous mode of operation. Conversely, a peak in interocean exchange at the end of the MIS 11 interglacial optimum may reflect enhanced trade wind forcing of surface waters whose export to the North Atlantic Ocean could have contributed to renewed ice sheet buildup during the MIS 11 to 10 glacial inception. |
format |
Article in Journal/Newspaper |
author |
Dickson, Alexander J. Leng, Melanie J. Maslin, Mark A. Sloane, Hilary J. Green, Joanne Bendle, James A. McClymont, Erin L. Pancost, Richard D. |
spellingShingle |
Dickson, Alexander J. Leng, Melanie J. Maslin, Mark A. Sloane, Hilary J. Green, Joanne Bendle, James A. McClymont, Erin L. Pancost, Richard D. Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
author_facet |
Dickson, Alexander J. Leng, Melanie J. Maslin, Mark A. Sloane, Hilary J. Green, Joanne Bendle, James A. McClymont, Erin L. Pancost, Richard D. |
author_sort |
Dickson, Alexander J. |
title |
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
title_short |
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
title_full |
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
title_fullStr |
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
title_full_unstemmed |
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 |
title_sort |
atlantic overturning circulation and agulhas leakage influences on southeast atlantic upper ocean hydrography during marine isotope stage 11 |
publishDate |
2010 |
url |
https://hdl.handle.net/1983/2e41503d-3135-4e54-a362-0fef4aba24a2 https://research-information.bris.ac.uk/en/publications/2e41503d-3135-4e54-a362-0fef4aba24a2 https://doi.org/10.1029/2009PA001830 http://www.scopus.com/inward/record.url?scp=77955505737&partnerID=8YFLogxK |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Ice Sheet North Atlantic Planktonic foraminifera |
genre_facet |
Ice Sheet North Atlantic Planktonic foraminifera |
op_source |
Dickson , A J , Leng , M J , Maslin , M A , Sloane , H J , Green , J , Bendle , J A , McClymont , E L & Pancost , R D 2010 , ' Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 ' , Paleoceanography , vol. 25 , no. 3 , PA3208 . https://doi.org/10.1029/2009PA001830 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2009PA001830 |
container_title |
Paleoceanography |
container_volume |
25 |
container_issue |
3 |
_version_ |
1789333470147772416 |