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<b>From:</b> Eric Chassignet <echassignet@fsu.edu><br>
<b>Sent:</b> Thursday, April 11, 2024 4:26 PM<br>
<b>To:</b> eoas-seminar@lists.fsu.edu <eoas-seminar@lists.fsu.edu><br>
<b>Cc:</b> seminar@coaps.fsu.edu <seminar@coaps.fsu.edu><br>
<b>Subject:</b> Physical Oceanography seminar "The Southern Ocean in a Warming Climate" by Qian Li - Monday April 15 at 1:30pm in EOAS 6042</div>
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<span style="font-size: 12pt;">Please join us for a seminar by Physical Oceanography candidate Qian Li Monday April 15 at 1:30pm in EOAS
</span><span style="font-size: 16px; background-color: rgb(255, 255, 255);">6042.</span></div>
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The Southern Ocean in a Warming Climate</div>
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In a warming climate, the Antarctic ice sheet has been losing mass to the ocean at an accelerating rate. The Antarctic sea ice extent has taken a regime shift from relatively gradual increases to rapid decreases. Concurrently, the Southern Ocean circulation
has been changing. Yet, the mechanisms controlling the long-term polar ice-ocean interaction remain unclear.</div>
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In this talk, I will first use a high-resolution (~0.1°) global ocean–sea-ice model to show the critical importance of Antarctic meltwater in influencing future trends in the abyssal ocean overturning circulation and properties. Rapid melting freshens the surface
ocean and strengthens the stratification, preventing the formation of dense shelf water and Antarctic Bottom Water (AABW). A slowdown in the sinking of AABW results in warming and ageing of the abyssal ocean, with implications for global ocean biogeochemistry
and climate that could last for centuries. Second, in the framework of residual-mean theory, I will show a two-time-scale response of the Southern Ocean overturning circulation to westerly winds. The essentially white-noise forcing by westerly winds triggers
high-frequency fluctuations of the ocean’s overturning circulation. The oceanic eddy-driven component, instead, responds on decadal timescales, leading to the ocean heat transport convergence into the seasonal ice zone and a decadal decrease in sea ice extent.
It suggests that the rapid decline in Antarctic sea ice observed in recent years may be part of natural variability and not necessarily associated with anthropogenic climate change.</div>
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Eric Chassignet</div>
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Professor and Director</div>
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Center for Ocean-Atmospheric Prediction Studies (COAPS)</div>
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Florida State University</div>
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2000 Levy Avenue, Building A, Suite 292</div>
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P.O. Box 3062741</div>
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Tallahassee, FL 32306-2741</div>
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Office : (1) 850-645-7288</div>
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COAPS : (1) 850-644-3846</div>
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Cell : (1) 850-524-0033 (urgent matters only)</div>
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FAX : (1) 850-644-4841</div>
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E-mail : echassignet@fsu.edu</div>
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