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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">Hi All,</span></p>
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You are cordially invited to attend the weekly EOAS Colloquium Series for the 2025–2026 academic year. Below are the details of the seminar scheduled for December 5, 2025. A poster of the colloquium is also attached to this email. Look forward to seeing you
at the colloquium. </div>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">=============</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"><b>Time:</b></span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">3:00 - 4:00 PM, Friday, December 5.</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"><b>Location:</b></span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">EOA 1044</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"><b>Speaker:</b></span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">Prof. Yao Fu</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"><b>Title: </b></span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">Interannual variability of the subpolar AMOC</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"><b>Abstract:</b></span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">Variability of the Atlantic Meridional Overturning Circulation (AMOC) has drawn extensive attention due to its impact on the global redistribution of heat and freshwater. Here we present
the latest time series (2014-2022) of the Overturning in the Subpolar North Atlantic Program (OSNAP) and characterize AMOC interannual variability through a volume budget analysis for the subpolar basins’ lower limbs. We find that surface water mass transformation
is linked to lower limb volume variability, which translates to AMOC changes within the same year.</span></p>
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The subpolar North Atlantic has also undergone unprecedented freshening in the past decade. The OSNAP observations provide a unique opportunity to examine how freshwater forcing influences AMOC variability. Preliminary results show that as the freshwater anomaly
moved through first the eastern and then the western subpolar gyre, it generated a transient AMOC signal on interannual timescales: overturning weakened in the eastern subpolar gyre but strengthened in the western gyre a few months later. In both gyres, the
overturning changes were linked to salinity-induced density anomalies, which produced cross-basin geostrophic velocity anomalies. Our findings highlight the role of freshwater forcing in subpolar AMOC variability on interannual timescales and suggest a compensating
mechanism between eastern and western subpolar overturning.</div>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">================</span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">Ming Ye, Robert Spenser, and Zhaohua Wu</span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);">Zhaohua Wu, Professor </span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);">Earth, Ocean, and Atmospheric Science Building, Room 6041, and</span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);">Center for Ocean-Atmospheric Prediction Studies, Room 295 </span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);">Florida State University </span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);">Tallahassee, Florida </span></p>
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11.5pt; color: rgb(32, 31, 30);"><a style="margin-top: 0px; margin-bottom: 0px;" class="OWAAutoLink" id="OWA5816323f-1e01-0506-06c9-234087c72aab" href="mailto:zwu@fsu.edu">zwu@fsu.edu</a> </span></p>
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