Glacial North Atlantic: Sea surface conditions reconstructed by GLAMAP 2000, supplement to: Pflaumann, Uwe; Sarnthein, Michael; Chapman, Mark R; de Abreu, Lucia; Funnell, Brian M; Hüls, Matthias; Kiefer, Thorsten; Maslin, Mark A; Schulz, Hartmut; Swallow, John; van Kreveld, Shirley A; Vautravers, Maryline J; Vogelsang, Elke; Weinelt, Mara (2003): Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000. Paleoceanography, 18(3), 1065

DOI

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 45° and 60°N, with a cool water mass centered west of Ireland, where glacial cooling reached a maximum of >12°C. 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 2° and 6°N 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 6°–8°C 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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.692144
Related Identifier https://doi.org/10.1029/2002PA000774
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.692144
Provenance
Creator Pflaumann, Uwe; Sarnthein, Michael; Chapman, Mark R; de Abreu, Lucia; Funnell, Brian M; Hüls, Matthias; Kiefer, Thorsten; Maslin, Mark A; Schulz, Hartmut; Swallow, John; van Kreveld, Shirley A; Vautravers, Maryline J; Vogelsang, Elke; Weinelt, Mara
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2003
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (-92.470W, -56.830S, 40.908E, 85.390N); Northeast Atlantic; South Atlantic Ocean; Walvis Ridge; Angola Basin; Walvis Ridge, Southeast Atlantic Ocean; Guinea Basin; Equatorial Atlantic; Brazil Basin; Cape Basin; Hunter Channel; Eastern Rio Grande Rise; Northern Guinea Basin; Southwest Guinea Basin; Cardno Seamount; West Angola Basin; Mid Atlantic Ridge; East Brazil Basin; Amazon Fan; Congo Fan; Namibia Continental Margin; Namibia continental slope; Atlantic Ocean; East Atlantic; North Atlantic; off West Africa; off Iceland; off Guinea; eastern Romanche Fracture Zone; Sierra Leone Basin/Guinea Basin; off Liberia; off eastern Ghana; off Nigeria; off Nigeria-Delta; off Gabun; Biscaya; Norwegian Sea; Arctic Ocean; Greenland Sea; Norwegian-Greenland Sea; North Atlantic Ocean; Voring Plateau; Bear Island Fan; Porto Seamount; Fram Strait; Iceland Sea; Svalbard; Antarctic Ocean; Yermak Plateau; Jan Mayen Fracture Zone; Greenland Slope; Barents Sea; East Greenland Sea; Denmark Strait; Aegir Ridge, Norwegian-Greenland Sea; off Portugal; Indian Ocean
Temporal Coverage Begin 1953-07-30T00:00:00Z
Temporal Coverage End 1997-09-03T00:54:00Z