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SUMMARY:Observed warming and increased basal melting at Fimbulisen Ice She
 lf\, East Antarctica - Julius Lauber\, NPolar
DTSTART:20231025T140000Z
DTEND:20231025T150000Z
UID:TALK206788@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:Most East Antarctic ice shelf cavities host cold water masses 
 that limit basal melting\, and only few short-term observational studies e
 xist on what drives warm water intrusions into these cavities. We present 
 nine years of continuous oceanographic records (2009-2019) from below Fimb
 ulisen in Dronning Maud Land\, East Antarctica. Joint analyses with oceani
 c and atmospheric forcing variables reveal the drivers of warm inflow vari
 ability into this ice shelf cavity. On monthly time scales\, warm inflow e
 vents are associated with local westerly wind anomalies reducing downwelli
 ng in front of the ice shelf. In 2016\, however\, our observations show a 
 statistically significant regime shift toward a more sustained warm inflow
  that persists until the end of the data record. During this period\, at t
 imes\, unmodified Warm Deep Water intrudes into the cavity. We find that t
 his transition is linked to a reduction in coastal sea ice cover and a str
 engthening of remote subpolar westerlies. As a potential result of this en
 hanced warm inflow\, a satellite-derived basal melt rate estimate of 0.62 
 m/year is nearly double the climatological basal mass loss at this cold ic
 e shelf cavity. These results imply that East Antarctic ice shelves may be
 come more exposed to warmer waters with a projected increase of circum-Ant
 arctic westerlies\, increasing this region’s relevance for sea level ris
 e projections.
LOCATION:BAS Seminar Room 2\; https://ukri.zoom.us/j/94382564745
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