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Rapid shifts in subarctic Pacific climate between 138 and 70 ka

Lars Max, Lukas Belz, Ralf Tiedemann, Kirsten Fahl, Dirk Nuernberg and Jan-Rainer Riethdorf
Rapid shifts in subarctic Pacific climate between 138 and 70 ka
Geology (Boulder) (October 2014) 42 (10): 899-902

Abstract

During the past decades, remarkable changes in sea-surface temperature (SST) and sea-ice extent have been observed in the marginal seas of the subarctic Pacific. However, little is known about natural climate variability at millennial time scales far beyond instrumental observations. Geological proxy records, such as those derived from marine sediments, offer a unique opportunity to investigate millennial-scale natural climate variability of the Arctic and subarctic environments during past glacial-interglacial cycles. Here we provide reconstructions of sea-ice variability inferred from IP (sub 25) (Ice Proxy with 25 carbon atoms) sea-ice biomarker and SST fluctuations based on alkenone unsaturation index (Formula ) of the subarctic Pacific realm between 138 and 70 ka. Warmest sea-surface conditions were found during the early Eemian interglacial (128 to 126 ka), exceeding modern SSTs by approximately 2 degrees C. The further North Pacific climate evolution is marked by pronounced oscillations in SST and sea-ice extent on millennial time scales, which correspond remarkably well to short-term temperature oscillations known from Greenland and the North Atlantic. These results imply a common forcing, which seems to be closely coupled to dynamics of the Atlantic meridional overturning circulation. However, immediate propagation of such climate fluctuations far beyond the North Atlantic basin suggests a rapid circumpolar coupling mechanism probably acting through the atmosphere, a prerequisite to explain the apparent synchronicity of remote climatic reorganizations in the subarctic Pacific.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 10
Title: Rapid shifts in subarctic Pacific climate between 138 and 70 ka
Affiliation: Alfred-Wegener-Institut, Helmholtz-Zentrum fuer Polar- und Meeresforschung, Bremerhaven, Germany
Pages: 899-902
Published: 201410
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2014-082862
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014317
Illustration Description: illus. incl. sketch map
N55°29'06" - N55°29'06", W14°42'08" - W14°42'08"
Secondary Affiliation: Helmholtz-Zentrum Potsdam, DEU, GermanyHelmholtz-Zentrum fuer Ozeanforschung, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201443
Program Name: ODPOcean Drilling Program
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