A “critical” climatic evaluation of last interglacial (MIS 5e) records from the Norwegian Sea

Polar research

Helmut Erlenkeuser¹  Henning A. Bauch² 

[1] Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, University of Kiel, Max-Eyth-Strasse 11, DE-24098 Kiel, Germany;Mainz Academy of Sciences, Humanities and Literature, c/o Leibniz Institute of Marine Sciences, University of Kiel, Wischhofstrasse 1-3, DE-24148 Kiel, Germany.Correspondence

关键词: Holocene;    last interglacial;    Nordic seas;    palaeoceanography;    planktic foraminifers;    stable isotopes.;   

DOI  :  10.1111/j.1751-8369.2008.00059.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Sediment cores from the Norwegian Sea were studied to evaluate interglacial climate conditions of the marine isotope stage 5e (MIS 5e). Using planktic forminiferal assemblages as the core method, a detailed picture of the evolution of surface water conditions was derived. According to our age model, a steplike deglaciation of the Saalian ice sheets is noted between ca. 135 and 124.5 Kya, but the deglaciation shows little response with regard to surface ocean warming. From then on, the rapidly increasing abundance of subpolar forminifers, concomitant with decreasing iceberg indicators, provides evidence for the development of interglacial conditions sensu stricto (5e-ss), a period that lasted for about 9 Ky. As interpreted from the foraminiferal records, and supported by the other proxies, this interval of 5e-ss was in two parts: showing an early warm phase, but with a fresher, i.e., lower salinity, water mass, and a subsequent cooling phase that lasted until ca. 118.5 Kya. After this time, the climatic op...

【 授权许可】

CC BY-NC