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SUMMARY:Decadal variability of ice-shelf melting in the Amundsen Sea drive
 n by sea-ice freshwater fluxes - Michael Haigh\, British Antarctic Survey
DTSTART:20240124T140000Z
DTEND:20240124T150000Z
UID:TALK209923@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:The ice streams flowing into the Amundsen Sea\, West Antarctic
 a\, are losing mass due to changes in the oceanic basal melting of their f
 loating ice shelves. Rapid ice-shelf melting is sustained by the delivery 
 of warm Circumpolar Deep Water to the ice-shelf cavities\, which is first 
 supplied to the continental shelf by an undercurrent that flows eastward a
 long the shelf break. Temporal variability of this undercurrent controls v
 ariations in ice-shelf basal melt. Recent work shows that on decadal times
 cales the undercurrent variability opposes surface wind variability. Using
  a regional model\, we show that this undercurrent variability is driven b
 y sea-ice freshwater fluxes\, particularly those north of the shelf break\
 , which affect the cross-shelf break density gradient. This sea-ice variab
 ility is caused by tropical Pacific variability impacting atmospheric cond
 itions over the Amundsen Sea. Ice-shelf melting also feeds back onto the u
 ndercurrent by affecting the on-shelf density and thereby influencing shel
 f-break density gradient anomalies.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/92483527729
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