(Table 1) Age control and temporal resolution of paleoceanographic records of the North Atlantic, supplement to: Weinelt, Mara; Vogelsang, Elke; Kucera, Michal; Pflaumann, Uwe; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut; Malmgren, Bjorn (2003): Variability of North Atlantic heat transfer during MIS2. Paleoceanography, 18(3), 1065


Short-term changes in sea surface conditions controlling the thermohaline circulation in the northern North Atlantic are expected to be especially efficient in perturbing global climate stability. Here we assess past variability of sea surface temperature (SST) in the northeast Atlantic and Norwegian Sea during Marine Isotope Stage (MIS) 2 and, in particular, during the Last Glacial Maximum (LGM). Five high-resolution SST records were established on a meridional transect (53°N-72°N) to trace centennial-scale oscillations in SST and sea-ice cover. We used three independent computational techniques (SIMMAX modern analogue technique, Artificial Neural Networks (ANN), and Revised Analog Method (RAM)) to reconstruct SST from planktonic foraminifer census counts. SIMMAX and ANN reproduced short-term SST oscillations of similar magnitude and absolute levels, while RAM, owing to a restrictive analog selection, appears less suitable for reconstructing "cold end" SST. The SIMMAX and ANN SST reconstructions support the existence of a weak paleo-Norwegian Current during Dansgaard-Oeschger (DO) interstadials number 4, 3, 2, and 1. During the LGM, two warm incursions of 7°C water to occurred in the northern North Atlantic but ended north of the Iceland Faroe Ridge. A rough numerical estimate shows that the near-surface poleward heat transfer from 53° across the Iceland-Faroe Ridge up to to 72° N dropped to less than 60% of the modern value during DO interstadials and to almost zero during DO stadials. Summer sea ice was generally confined to the area north of 70°N and only rarely expanded southward along the margins of continental ice sheets. Internal LGM variability of North Atlantic (>40°N) SST in the GLAMAP 2000 compilation (Sarnthein et al., 2003, doi:10.1029/2002PA000771; Pflaumann et al., 2003, doi:10.1029/2002PA000774) indicates maximum instability in the glacial subpolar gyre and at the Iberian Margin, while in the Nordic Seas, SST was continuously low.

DOI https://doi.org/10.1594/PANGAEA.841465
Related Identifier https://doi.org/10.1029/2002PA000772
Related Identifier https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3781
Related Identifier https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3834
Related Identifier https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/2038
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.841465
Creator Weinelt, Mara; Vogelsang, Elke; Kucera, Michal; Pflaumann, Uwe; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut; Malmgren, Bjorn
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2003
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 155 data points
Discipline Earth System Research
Spatial Coverage (-19.145W, 53.178S, 11.434E, 72.151N); off Iceland; Norwegian Sea; Bear Island Fan
Temporal Coverage Begin 1986-07-12T00:00:00Z
Temporal Coverage End 1995-06-09T00:00:00Z