Journal article Open Access

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

Wary, M.; Eynaud, F.; Swingedouw, D.; Masson-Delmotte, V.; Matthiessen, J.; Kissel, C.; Zumaque, J.; Zumaque, J.; Rossignol, L.; Jouzel, J.


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    <subfield code="a">Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events</subfield>
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    <subfield code="a">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.</subfield>
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