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Enhanced climate instability in the North Atlantic and southern Europe during the Last Interglacial

AuthorsTzedakis, P. C.; Drysdale, Russell N.; Margari, Vasiliki; Skinner, Luke C.; Menviel, Laurie; Rhodes, Rachael H.; Taschetto, Andréa Sardinha; Hodell, David A.; Crowhurst, Simon J.; Hellstrom, John C.; Fallick, Anthony Edward; Grimalt, Joan O. ; McManus, Jerry F.; Martrat, Belen ; Mokeddem, Zohra; Parrenin, Frédéric; Regattieri, Eleonora; Roe, K.; Zanchetta, Giovanni
KeywordsLast interglacial
Issue Date1-Dec-2018
PublisherSpringer Nature
CitationNature Communications 9 (1): 4235 (2018)
AbstractConsiderable ambiguity remains over the extent and nature of millennial/centennial-scale climate instability during the Last Interglacial (LIG). Here we analyse marine and terrestrial proxies from a deep-sea sediment sequence on the Portuguese Margin and combine results with an intensively dated Italian speleothem record and climate-model experiments. The strongest expression of climate variability occurred during the transitions into and out of the LIG. Our records also document a series of multi-centennial intra-interglacial arid events in southern Europe, coherent with cold water-mass expansions in the North Atlantic. The spatial and temporal fingerprints of these changes indicate a reorganization of ocean surface circulation, consistent with low-intensity disruptions of the Atlantic meridional overturning circulation (AMOC). The amplitude of this LIG variability is greater than that observed in Holocene records. Episodic Greenland ice melt and runoff as a result of excess warmth may have contributed to AMOC weakening and increased climate instability throughout the LIG. © 2018, The Author(s).
Publisher version (URL)https://doi.org/10.1038/s41467-018-06683-3
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