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SUMMARY:Holocene sea-ice dynamics north of Greenland – from the Arctic
 ’s Last Ice Area to the North Water Polynya - Henrieka Detlef\, Aarhus U
 niversity
DTSTART:20260218T173000Z
DTEND:20260218T190000Z
UID:TALK243679@talks.cam.ac.uk
CONTACT:91369
DESCRIPTION:The northern coastline of Greenland\, spanning from the Lincol
 n Sea to northern Baffin Bay\, is a unique sea-ice regime. It is part of t
 he Last Ice Area\, where the dominant surface currents in the Arctic Ocean
  push sea ice towards the coastlines of northern Greenland and the Canadia
 n Arctic Archipelago. Research indicates that\, under continued and future
  climate warming\, the Last Ice Area is expected to remain the final refug
 e of multi-year sea ice in the Arctic\, important for sea-ice dependent ec
 osystems. However\, prolonged periods of open water observed in the Lincol
 n Sea and elsewhere in the Last Ice Area during recent years raise concern
 s about its long-term stability. From the Lincoln Sea\, the Nares Strait c
 onnects the perennially sea-ice covered Last Ice Area to the Pikialasorsua
 q or North Water Polynya (NOW)\, the Arctic’s largest and most productiv
 e polynya. The NOW is influenced by both sensible and latent heat processe
 s\, with the latter driven by strong northeasterly winds and aided by the 
 formation of ice arches in the narrow passages of Nares Strait. Recurrent 
 failure of ice arches in Nares Strait during recent years influence the ex
 tent\, ice cover\, and stratification of the NOW and with it its ecosystem
 . \n\nUsing sea-ice biomarkers on a transect of marine sediment cores span
 ning from the Lincoln Sea to northern Baffin Bay\, we can investigate the 
 stability of perennial sea ice in the Last Ice Area\, understand the evolu
 tion of ice arching in Nares Strait\, and explore the extent of the NOW th
 roughout the Holocene. In the context of regional climate variability and 
 ocean circulation\, this can provide insights into the mechanisms governin
 g sea-ice dynamics in this region and improve our understanding of their s
 patiotemporal links to ecosystem shifts.\n
LOCATION:Latimer Room\, Clare College
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