Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000
The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foramin...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:101363 2023-12-24T10:17:59+01:00 Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 Pflaumann, U Sarnthein, M Chapman, M d'Abreu, L Funnell, B Huels, M Kiefer, T Maslin, M Schulz, H Swallow, J van Kreveld, S Vautravers, M Vogelsang, E Weinelt, M 2003-08-02 application/pdf https://discovery.ucl.ac.uk/id/eprint/101363/1/2002PA000774.pdf https://discovery.ucl.ac.uk/id/eprint/101363/ eng eng AMER GEOPHYSICAL UNION https://discovery.ucl.ac.uk/id/eprint/101363/1/2002PA000774.pdf https://discovery.ucl.ac.uk/id/eprint/101363/ open Paleoceanography , 18 (3) , Article 1065. (2003) Last glacial maximum Atlantic sea-surface Temperatures Seasonality Sea ice cover Glacial cooling near equator Glacial upwelling intensity Eurasian ice sheets Time-slice record Last 30,000 years Planktonic-foraminifera Tropical Atlantic Climate-change Oxygen isotopes East Atlantic Age tropics Maximum Article 2003 ftucl 2023-11-27T13:07:30Z The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP 2000) time slices. The comparison shows that the maximum LGM cooling in the Southern Hemisphere slightly preceeded that in the north. In both time slices sea ice was restricted to the north western margin of the nordic seas during glacial northern summer, while the central and eastern parts were ice-free. During northern glacial winter, sea ice advanced to the south of Iceland and Faeroe. In the central northern North Atlantic an anticyclonic gyre formed between 45degrees and 60degreesN, with a cool water mass centered west of Ireland, where glacial cooling reached a maximum of >12degreesC. In the subtropical ocean gyres the new reconstruction supports the glacial-to-interglacial stability of SST as shown by CLIMAP Project Members (CLIMAP) [1981]. The zonal belt of minimum SST seasonality between 2degrees and 6degreesN suggests that the LGM caloric equator occupied the same latitude as today. In contrast to the CLIMAP reconstruction, the glacial cooling of the tropical east Atlantic upwelling belt reached up to 6degrees-8degreesC during Northern Hemisphere summer. Differences between these SIMMAX-based and published U37(k)- and Mg/Ca-based equatorial SST records are ascribed to strong SST seasonalities and SST signals that were produced by different planktic species groups during different seasons. Article in Journal/Newspaper Iceland Nordic Seas North Atlantic Planktonic foraminifera Sea ice University College London: UCL Discovery |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Last glacial maximum Atlantic sea-surface Temperatures Seasonality Sea ice cover Glacial cooling near equator Glacial upwelling intensity Eurasian ice sheets Time-slice record Last 30,000 years Planktonic-foraminifera Tropical Atlantic Climate-change Oxygen isotopes East Atlantic Age tropics Maximum |
spellingShingle |
Last glacial maximum Atlantic sea-surface Temperatures Seasonality Sea ice cover Glacial cooling near equator Glacial upwelling intensity Eurasian ice sheets Time-slice record Last 30,000 years Planktonic-foraminifera Tropical Atlantic Climate-change Oxygen isotopes East Atlantic Age tropics Maximum Pflaumann, U Sarnthein, M Chapman, M d'Abreu, L Funnell, B Huels, M Kiefer, T Maslin, M Schulz, H Swallow, J van Kreveld, S Vautravers, M Vogelsang, E Weinelt, M Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
topic_facet |
Last glacial maximum Atlantic sea-surface Temperatures Seasonality Sea ice cover Glacial cooling near equator Glacial upwelling intensity Eurasian ice sheets Time-slice record Last 30,000 years Planktonic-foraminifera Tropical Atlantic Climate-change Oxygen isotopes East Atlantic Age tropics Maximum |
description |
The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP 2000) time slices. The comparison shows that the maximum LGM cooling in the Southern Hemisphere slightly preceeded that in the north. In both time slices sea ice was restricted to the north western margin of the nordic seas during glacial northern summer, while the central and eastern parts were ice-free. During northern glacial winter, sea ice advanced to the south of Iceland and Faeroe. In the central northern North Atlantic an anticyclonic gyre formed between 45degrees and 60degreesN, with a cool water mass centered west of Ireland, where glacial cooling reached a maximum of >12degreesC. In the subtropical ocean gyres the new reconstruction supports the glacial-to-interglacial stability of SST as shown by CLIMAP Project Members (CLIMAP) [1981]. The zonal belt of minimum SST seasonality between 2degrees and 6degreesN suggests that the LGM caloric equator occupied the same latitude as today. In contrast to the CLIMAP reconstruction, the glacial cooling of the tropical east Atlantic upwelling belt reached up to 6degrees-8degreesC during Northern Hemisphere summer. Differences between these SIMMAX-based and published U37(k)- and Mg/Ca-based equatorial SST records are ascribed to strong SST seasonalities and SST signals that were produced by different planktic species groups during different seasons. |
format |
Article in Journal/Newspaper |
author |
Pflaumann, U Sarnthein, M Chapman, M d'Abreu, L Funnell, B Huels, M Kiefer, T Maslin, M Schulz, H Swallow, J van Kreveld, S Vautravers, M Vogelsang, E Weinelt, M |
author_facet |
Pflaumann, U Sarnthein, M Chapman, M d'Abreu, L Funnell, B Huels, M Kiefer, T Maslin, M Schulz, H Swallow, J van Kreveld, S Vautravers, M Vogelsang, E Weinelt, M |
author_sort |
Pflaumann, U |
title |
Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
title_short |
Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
title_full |
Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
title_fullStr |
Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
title_full_unstemmed |
Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 |
title_sort |
glacial north atlantic: sea-surface conditions reconstructed by glamap 2000 |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2003 |
url |
https://discovery.ucl.ac.uk/id/eprint/101363/1/2002PA000774.pdf https://discovery.ucl.ac.uk/id/eprint/101363/ |
genre |
Iceland Nordic Seas North Atlantic Planktonic foraminifera Sea ice |
genre_facet |
Iceland Nordic Seas North Atlantic Planktonic foraminifera Sea ice |
op_source |
Paleoceanography , 18 (3) , Article 1065. (2003) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/101363/1/2002PA000774.pdf https://discovery.ucl.ac.uk/id/eprint/101363/ |
op_rights |
open |
_version_ |
1786206470731202560 |