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SUMMARY:Recent increase in surface melting of West Antarctic ice shelves l
 inked to Interdecadal Pacific Oscillation - Dr Pranab Deb\, Assistant Prof
 essor\, Centre for Oceans\, River\, Atmosphere\, and Land Sciences (CORAL)
 \, IIT Kharagpur\, India and previously at BAS
DTSTART:20250506T130000Z
DTEND:20250506T140000Z
UID:TALK231259@talks.cam.ac.uk
CONTACT:Siddharth Gumber
DESCRIPTION:Since the late 1990s\, summer surface melt across ice shelves 
 in the Ross-Amundsen Sea sector of West Antarctica increased significantly
 \, as demonstrated by satellite measurements and MetUM simulations. This c
 ontrasts with the period from 1979 to the late 1990s\, which witnessed a d
 ecreasing summer melt trend driven by the positive trend in Southern Annul
 ar Mode. The increase in summer melt since the late 1990s is linked to an 
 increase in geopotential height and intensified anticyclonic blocking alon
 g coastal West Antarctica\, which strengthened northerly winds over the Ro
 ss-Amundsen Sea sector\, leading to enhanced advection of warm\, marine ai
 r. Our analysis reveals a strong connection between summer melt indices an
 d sea surface temperatures in the South Pacific Convergence Zone during th
 is period. Moreover\, increased summer precipitation in South Pacific Conv
 ergence Zone since the late 1990s strengthened the Rossby wave teleconnect
 ion toward West Antarctica\, contributing to enhanced blocking along the c
 oastal region. This is consistent with the transition of the Interdecadal 
 Pacific Oscillation to its negative phase.
LOCATION:BAS Seminar Room 1 and Zoom
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