Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events
|Author(s)||Wary Melanie1, Eynaud Frederique1, Swingedouw Didier1, Masson-Delmotte Valerie2, Matthiessen Jens3, 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|
|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.