Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates
[1] Using 150 core top samples, we developed a conservative but fairly robust new measure to reconstruct past changes in (maximum) seasonal sea ice distribution in the northern North Atlantic, hitherto a major unknown. The proxy is based on Similarity Maximum Modern-Analog Technique (SIMMAX) estimat...
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AGU (American Geophysical Union)
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Online Access: | https://oceanrep.geomar.de/id/eprint/33590/ https://oceanrep.geomar.de/id/eprint/33590/1/Sarnthein.pdf https://doi.org/10.1029/2002PA000771 |
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ftoceanrep:oai:oceanrep.geomar.de:33590 2023-05-15T15:10:01+02:00 Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates Sarntheim, Michael Pflaumann, Uwe Weinelt, Mara 2003 text https://oceanrep.geomar.de/id/eprint/33590/ https://oceanrep.geomar.de/id/eprint/33590/1/Sarnthein.pdf https://doi.org/10.1029/2002PA000771 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/33590/1/Sarnthein.pdf Sarntheim, M., Pflaumann, U. and Weinelt, M. (2003) Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates. Paleoceanography, 18 (2). p. 1047. DOI 10.1029/2002PA000771 <https://doi.org/10.1029/2002PA000771>. doi:10.1029/2002PA000771 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2003 ftoceanrep https://doi.org/10.1029/2002PA000771 2023-04-07T15:26:56Z [1] Using 150 core top samples, we developed a conservative but fairly robust new measure to reconstruct past changes in (maximum) seasonal sea ice distribution in the northern North Atlantic, hitherto a major unknown. The proxy is based on Similarity Maximum Modern-Analog Technique (SIMMAX) estimates of threshold temperatures near the sea surface (SST). Today, almost 100% of all sites with SST >2.5°C during summer, >0.4° for winters 1978–1987, and >0.75°C for Little Ice Age winters lie seaward of the sea ice margin. When applied to >60 sediment records of the Last Glacial Maximum, this proxy shows that peak glacial sea ice was far more restricted than in the “classic” CLIMAP Project Members [1981] reconstruction. During glacial summer, sea ice only covered the Arctic Ocean and western Fram Strait. The northern North Atlantic and Nordic Seas were largely ice-free and thus formed a high-latitude moisture source for the continued buildup of continental ice sheets. In contrast, sea ice spread far south across the Iceland Faeroe Ridge during glacial winter, with an inferred patch of sea ice also in the central east Atlantic, near the center of the Azores High. A broad ice-free channel extended from 50° to 60°N, forming an ideal site for large-scale convection of glacial upper North Atlantic Deep Water. The extreme seasonality in glacial sea ice formation and melt in the Nordic Seas implies a major consumption of the regional energy income. Article in Journal/Newspaper Arctic Arctic Ocean Foraminifera* Fram Strait Iceland Nordic Seas North Atlantic Deep Water North Atlantic Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Paleoceanography 18 2 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
[1] Using 150 core top samples, we developed a conservative but fairly robust new measure to reconstruct past changes in (maximum) seasonal sea ice distribution in the northern North Atlantic, hitherto a major unknown. The proxy is based on Similarity Maximum Modern-Analog Technique (SIMMAX) estimates of threshold temperatures near the sea surface (SST). Today, almost 100% of all sites with SST >2.5°C during summer, >0.4° for winters 1978–1987, and >0.75°C for Little Ice Age winters lie seaward of the sea ice margin. When applied to >60 sediment records of the Last Glacial Maximum, this proxy shows that peak glacial sea ice was far more restricted than in the “classic” CLIMAP Project Members [1981] reconstruction. During glacial summer, sea ice only covered the Arctic Ocean and western Fram Strait. The northern North Atlantic and Nordic Seas were largely ice-free and thus formed a high-latitude moisture source for the continued buildup of continental ice sheets. In contrast, sea ice spread far south across the Iceland Faeroe Ridge during glacial winter, with an inferred patch of sea ice also in the central east Atlantic, near the center of the Azores High. A broad ice-free channel extended from 50° to 60°N, forming an ideal site for large-scale convection of glacial upper North Atlantic Deep Water. The extreme seasonality in glacial sea ice formation and melt in the Nordic Seas implies a major consumption of the regional energy income. |
format |
Article in Journal/Newspaper |
author |
Sarntheim, Michael Pflaumann, Uwe Weinelt, Mara |
spellingShingle |
Sarntheim, Michael Pflaumann, Uwe Weinelt, Mara Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
author_facet |
Sarntheim, Michael Pflaumann, Uwe Weinelt, Mara |
author_sort |
Sarntheim, Michael |
title |
Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
title_short |
Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
title_full |
Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
title_fullStr |
Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
title_full_unstemmed |
Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates |
title_sort |
past extent of sea ice in the northern north atlantic inferred from foraminiferal paleotemperature estimates |
publisher |
AGU (American Geophysical Union) |
publishDate |
2003 |
url |
https://oceanrep.geomar.de/id/eprint/33590/ https://oceanrep.geomar.de/id/eprint/33590/1/Sarnthein.pdf https://doi.org/10.1029/2002PA000771 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Foraminifera* Fram Strait Iceland Nordic Seas North Atlantic Deep Water North Atlantic Sea ice |
genre_facet |
Arctic Arctic Ocean Foraminifera* Fram Strait Iceland Nordic Seas North Atlantic Deep Water North Atlantic Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/33590/1/Sarnthein.pdf Sarntheim, M., Pflaumann, U. and Weinelt, M. (2003) Past extent of sea ice in the northern North Atlantic inferred from foraminiferal paleotemperature estimates. Paleoceanography, 18 (2). p. 1047. DOI 10.1029/2002PA000771 <https://doi.org/10.1029/2002PA000771>. doi:10.1029/2002PA000771 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2002PA000771 |
container_title |
Paleoceanography |
container_volume |
18 |
container_issue |
2 |
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1766341096674164736 |