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SUMMARY:Ocean/sea-ice interactions at the floe scale: regimes of sea-ice f
 loe melt - Mukund Gupta (CALTECH (California Institute of Technology))
DTSTART:20220922T150000Z
DTEND:20220922T153000Z
UID:TALK178337@talks.cam.ac.uk
DESCRIPTION:At high latitudes\, the ocean is often covered by a thin layer
  of sea ice\, which forms in the winter due to the freezing of seawater. S
 ea ice is typically characterized by a collection of distinct pieces\, kno
 wn as ice floes\, which range in size between several meters to tens of ki
 lometers. In the summer\, floes melt due to a warm atmosphere above\, as w
 ell as a warm ocean below. The melting of sea-ice floes often generates sm
 all-scale (1 - 10 km) ocean currents at the surface\, which in turn affect
  sea-ice motion and melt. Here\, we study these ice-ocean interactions\, u
 sing an idealized sea-ice model coupled to a regional ocean model that res
 olves these fine-scale dynamics. We find that small-scale oceanic currents
  and surface winds accelerate the sea-ice melt rate by allowing warm water
 s to move into colder regions under the ice floes. Simple relationships\, 
 or scalings\, involving the floe size\, wind speed and ice-ocean friction\
 , are able to explain these varying ice floe melt rates across a range of 
 environmental conditions. These scalings\, when included in global climate
  models\, may help to improve future predictions of sea-ice changes by acc
 ounting for the impact of small-scale ocean currents.
LOCATION:Seminar Room 1\, Newton Institute
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