[Eoas-seminar] Colloquium on December 5, 3:00 PM at EOA 1044

[eoas-seminar at lists.fsu.edu]

Hi All,

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.


=============



Time:

3:00 - 4:00 PM, Friday, December 5.



Location:

EOA 1044



Speaker:

Prof. Yao Fu



Title:

Interannual variability of the subpolar AMOC


Abstract:


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.

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.


================



Ming Ye, Robert Spenser, and Zhaohua Wu



***************************************************************

Zhaohua Wu, Professor

Earth, Ocean, and Atmospheric Science Building, Room 6041, and

Center for Ocean-Atmospheric Prediction Studies, Room 295

Florida State University

Tallahassee, Florida

zwu at fsu.edu<mailto:zwu at fsu.edu>

****************************************************************


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.fsu.edu/pipermail/eoas-seminar/attachments/20251201/ba532e90/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 120525_Yao_Fu.pdf
Type: application/pdf
Size: 130187 bytes
Desc: 120525_Yao_Fu.pdf
URL: <http://lists.fsu.edu/pipermail/eoas-seminar/attachments/20251201/ba532e90/attachment-0001.pdf>