[Eoas-seminar] COAPS Short Seminar Series - Monday Feb. 6th at 11:00AM (update)

[eoas-seminar at lists.fsu.edu]

These talks are usually scheduled for the first Monday of each month. 
The first talk normally starts at 11:00AM.  Each talk is typically 12 
minutes long (similar to many professional meetings), with 8 minutes for 
questions.

The seminar series in now in a hybrid talk format where the speakers are 
encouraged to in-person at COAPS, but on-line talks are acceptable. In 
person and on-line talks can be attended via Zoom:

https://fsu.zoom.us/j/97668135992?pwd=Sy9sTFJKNUNobnJZc29nd25DVjkzZz09

Meeting ID: 976 6813 5992
Passcode: 038391

Feb. 6th

Subrat Kumar Mallick: Can Air-sea bulk formulations improve the ocean 
circulation model?

Description: Fluxes are the key driver for ocean circulation and energy 
distribution. The selection of advanced bulk formulation in the 
circulation model reflects the actual state plus a better understanding 
of weather and climate, as well as improved forecasts. The talk will 
describe progressive improvement in the ~10 km Regional Ocean 
Circulation model (i.e., MOM3) by switching over different bulk flux 
formulations.

Takaya Uchida: Is there any hope in the mesoscale eddy transport tensor 
in parametrizing sub-grid eddy dynamics? (40 minutes)

Description: Due to computational constraints, the model resolution of 
global- and basin-scale ocean simulations are often restricted to 1-1/10 
degrees in latitude and longitude (equivalent to 100-10 km resolution). 
This resolution is barely sufficient to resolve the storm system of the 
ocean on the scale of tens of kilometers, coined as mesoscale eddies. 
Nonetheless, it is now accepted in the field of ocean modeling that 
resolving these eddies leads to a more realistic representation of the 
ocean circulation and oceanic heat transport. There has, therefore, been 
an active effort to design sub-grid parametrizations to mimic the 
dynamical effect of eddies otherwise resolved under sufficient model 
resolution.


In the literature of eddy parametrization, it is common to relate the 
(sub-grid) eddy fluxes to the gradients of the resolved field via a 
scalar parameter, often referred to as eddy diffusivity and/or transport 
coefficient. This stems from the works by Redi (1982) and Gent and 
McWilliams (1990) known as the Redi isopycnal tracer transport 
coefficient and GM skew transport coefficient. A natural extension to 
this has been to replace the scalar coefficients with a tensor form, 
which allows us to incorporate the information of anisotropy in the 
flow. Here, I will provide an overview on eddy parametrizations in an 
oceanic context, present the tensor within the thickness-weighted 
averaged framework, a framework apt for the vertically stratified nature 
of the ocean, diagnosed from an eddying (1/12 degree) ensemble of the 
North Atlantic and idealized eddy-resolving double-gyre ensemble, and 
its utility in reconstructing the eddy flux of passive and active 
tracers such as potential vorticity.


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