[Eoas-seminar] EOAS Colloquium Friday Oct 14 at 3pm

[eoas-seminar at lists.fsu.edu]

Please join us for our next EOAS Colloquium speaker, Dr. Mark Bourassa 
of EOAS, on Friday Oct 14 at 3pm:

Title:  Roles and Impacts of Current, Surface Stress and Wind 
Interactions in a Coupled Ocean/Atmosphere System

Interaction between the ocean and the atmosphere on ‘large’ scales is 
usually thought of as dominated by thermodynamic interactions 
influencing the atmosphere and both wind stress and thermodynamics 
influencing the ocean. For models with grid spacing exceeding 20 km the 
role of currents in modifying this coupling is quite small. As model 
resolution improves, currents have been shown to have a substantial 
impact on the ocean. Accounting for how currents modify stress causes 
has been explored for ocean impacts while assuming that the atmosphere 
is otherwise unchanged. This modified stress results in more vertical 
motion in the ocean’s mixed layer and excessively reduces ocean eddies. 
These ocean responses will be demonstrated with and without atmospheric 
responses and it well be shown that these responses are very important 
and that they are highly dependent on atmospheric resolution. At 
sufficiently high resolution the atmosphere is much more variable than 
with coarser grid spacing, and currents contribute to organizing some of 
this variability, further complicating the ocean response. Part of the 
atmospheric response to currents will be shown to be patterns of curl 
and divergence of surface wind and stress, with a vorticity structure 
that extends to the top of the atmospheric boundary-layer and extends 
horizontally well beyond the strong current gradients. For the region 
and season examined, this coupling process causes modest changes in the 
atmospheric mean state. The impacts are wind speed dependent with a 
greater response associated with higher wind speeds. Interactions with 
an atmospheric front will be used to demonstrate relatively extreme 
atmospheric changes associated with ocean surface currents.


If you need a zoom link, please contact Dr. Zhaohua Wu zwu at fsu.edu.


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