Rapid shifts in subarctic Pacific climate between 138 and 70 ka
作者： Lars Max , Lukas Belz , Ralf Tiedemann , Kirsten Fahl , Dirk Nürnberg
DOI: 10.1130/G35879.1
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摘要: During the past decades, remarkable changes in sea-surface temperature (SST) and sea-ice extent have been observed marginal seas of 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 Artic environments during glacial-interglacial cycles. Here we provide reconstructions inferred IP25 (Ice Proxy with 25 carbon atoms) biomarker SST fluctuations based on alkenone unsaturation index (Graphic) Pacific realm between 138 70 ka. Warmest conditions were found early Eemian interglacial (128 126 ka), exceeding modern SSTs by ∼2 °C. The further North evolution marked pronounced oscillations scales, which correspond remarkably well short-term Greenland Atlantic. These results imply common forcing, seems be closely coupled dynamics Atlantic meridional overturning circulation. immediate propagation basin suggests rapid circumpolar coupling mechanism probably acting through atmosphere, prerequisite explain apparent synchronicity remote climatic reorganizations
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