Tropical and Antarctic sea ice impacts of observed Southern Ocean warming and cooling trends since 1949

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• Xiyue (Sally) Zhang (University of Nevada)
• Wednesday 02 October 2024, 15:30-16:30
• BAS Seminar Room 2; https://ukri.zoom.us/j/96469833792.

If you have a question about this talk, please contact Dr Birgit Rogalla.

For any external attendees, please email Birgit Rogalla (birgal at bas.ac.uk) and Yohei Takano (yokano at bas.ac.uk), so we can help arrange access to BAS .

Southern Ocean (SO) sea surface temperatures (SSTs) 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 nudged to observations. Compared to the control (no nudging) ensemble, the nudged ensemble shows enhanced SST warming in the tropical southeast Pacific and Atlantic, and greater Antarctic sea ice loss, during the SO warming period: analogous to the impacts of SO cooling but of opposite sign. The SO-driven response in the tropical Pacific (Atlantic) is statistically significant when considering the trend difference between the two periods, and accounts for 34% (59%) of the observed non-radiatively forced trend. Surface heat budget analysis indicates wind-evaporation-SST feedback dominates over shortwave cloud feedback in amplifying the SO-driven SST trends in the tropics during the SO warming period, opposite to that for the SO cooling period.

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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