Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events

Type Article
Date 2017-06-30
Language English
Author(s) Wary Melanie1, Eynaud FrederiqueORCID1, Swingedouw Didier1, Masson-Delmotte ValerieORCID2, Matthiessen JensORCID3, Kissel Catherine2, Zumaque Jena1, 4, Rossignol Linda1, Jouzel Jean2
Affiliation(s) 1 : Univ Bordeaux, EPHE, CNRS, UMR 5805,EPOC, F-33615 Pessac, France.
2 : UVSQ, INSU, CNRS, UMR8212,LSCE,IPSL,CEA, F-91191 Gif Sur Yvette, France.
3 : Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27568 Bremerhaven, Germany.
4 : Univ Quebec Montreal, Geotop, Montreal, PQ H3C 3P8, Canada.
Source Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2017-06-30 , Vol. 13 , N. 6 , P. 729-739
DOI 10.5194/cp-13-729-2017
WOS© Times Cited 8

Dansgaard-Oeschger oscillations constitute one of the most enigmatic features of the last glacial cycle. Their cold atmospheric phases have been commonly associated with cold sea-surface temperatures and expansion of sea ice in the North Atlantic and adjacent seas. Here, based on dinocyst analyses from the 48-30 ka interval of four sediment cores from the northern Northeast Atlantic and southern Norwegian Sea, we provide direct and quantitative evidence of a regional paradoxical seesaw pattern: cold Greenland and North Atlantic phases coincide with warmer sea-surface conditions and shorter seasonal sea-ice cover durations in the Norwegian Sea as compared to warm phases. Combined with additional palaeorecords and multi-model hosing simulations, our results suggest that during cold Greenland phases, reduced Atlantic meridional overturning circulation and cold North Atlantic sea-surface conditions were accompanied by the subsurface propagation of warm Atlantic waters that re-emerged in the Nordic Seas and provided moisture towards Greenland summit.

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Wary Melanie, Eynaud Frederique, Swingedouw Didier, Masson-Delmotte Valerie, Matthiessen Jens, Kissel Catherine, Zumaque Jena, Rossignol Linda, Jouzel Jean (2017). Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events. Climate Of The Past, 13(6), 729-739. Publisher's official version : , Open Access version :