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Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events.
- Source :
- Climate of the Past; 2017, Vol. 13 Issue 6, p729-739, 11p
- Publication Year :
- 2017
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18149324
- Volume :
- 13
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Climate of the Past
- Publication Type :
- Academic Journal
- Accession number :
- 123926226
- Full Text :
- https://doi.org/10.5194/cp-13-729-2017