Sea surface temperature variability and sea-ice extent in the subarctic northwest Pacific during the past 15,000 years

Max, Lars, Riethdorf, Jan-Rainer, Tiedemann, Ralf, Smirnova, Maria, Lembke-Jene, Lester, Fahl, Kirsten, Nürnberg, Dirk, Matul, Alexander and Mollenhauer, Gesine (2012) Sea surface temperature variability and sea-ice extent in the subarctic northwest Pacific during the past 15,000 years Paleoceanography, 27 (3). PA3213. DOI 10.1029/2012PA002292.

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Past changes in North Pacific sea surface temperatures and sea-ice conditions are proposed to play a crucial role in deglacial climate development and ocean circulation but are less well known than from the North Atlantic. Here, we present new alkenone-based sea surface temperature records from the subarctic northwest Pacific and its marginal seas (Bering Sea and Sea of Okhotsk) for the time interval of the last 15 kyr, indicating millennial-scale sea surface temperature fluctuations similar to short-term deglacial climate oscillations known from Greenland ice-core records. Past changes in sea-ice distribution are derived from relative percentage of specific diatom groups and qualitative assessment of the IP25 biomarker related to sea-ice diatoms. The deglacial variability in sea-ice extent matches the sea surface temperature fluctuations. These fluctuations suggest a linkage to deglacial variations in Atlantic meridional overturning circulation and a close atmospheric coupling between the North Pacific and North Atlantic. During the Holocene the subarctic North Pacific is marked by complex sea surface temperature trends, which do not support the hypothesis of a Holocene seesaw in temperature development between the North Atlantic and the North Pacific.
Key Points:
- Millennial-scale changes in SST in the North Pacific during the last 15 kyr
- Changes in sea-ice extent suggest a close coupling to SST fluctuations
- Middle to late Holocene SSTs show no clear SST trend in the North Pacific

Document Type: Article
Keywords: Greenland; Holocene; North Pacific; deglaciation; sea surface temperature; sea-ice
Research affiliation: AWI
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1029/2012PA002292
ISSN: 0883-8305
Date Deposited: 20 Sep 2012 09:59
Last Modified: 10 May 2017 07:10

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