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SUMMARY:Tropical and Antarctic sea ice impacts of observed Southern Ocean 
 warming and cooling trends since 1949 - Xiyue (Sally) Zhang (University of
  Nevada)
DTSTART:20241002T143000Z
DTEND:20241002T153000Z
UID:TALK220759@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:*For any external attendees\, please email Birgit Rogalla (bir
 gal at bas.ac.uk) and Yohei Takano (yokano at bas.ac.uk)\, so we can help 
 arrange access to BAS.*\n\nSouthern Ocean (SO) sea surface temperatures (S
 STs) warmed from approximately 1949–1978 and cooled slightly from 1979
 –2013. We compare the remote impacts of these SO trends using historical
  coupled model experiments in which the model’s SO SST anomalies are nud
 ged to observations. Compared to the control (no nudging) ensemble\, the n
 udged ensemble shows enhanced SST warming in the tropical southeast Pacifi
 c and Atlantic\, and greater Antarctic sea ice loss\, during the SO warmin
 g period: analogous to the impacts of SO cooling but of opposite sign. The
  SO-driven response in the tropical Pacific (Atlantic) is statistically si
 gnificant when considering the trend difference between the two periods\, 
 and accounts for 34% (59%) of the observed non-radiatively forced trend. S
 urface heat budget analysis indicates wind-evaporation-SST feedback domina
 tes over shortwave cloud feedback in amplifying the SO-driven SST trends i
 n the tropics during the SO warming period\, opposite to that for the SO c
 ooling period.
LOCATION:BAS Seminar Room 2\; https://ukri.zoom.us/j/96469833792
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