[MITgcm-support] Revisiting Online PV Diagnostics

[钱钰坤]

Hi Jacob,


I'm also interested in such an online PV diagnostics, although I've known that there is an offline version written by Guillaume Maze (see the manual).


I am also curious about where to define PV in the model because MITgcm use the C-grid so that the vorticity grid is different from mass (density) grid.  Since PV is defined as the product of vorticity and density, we can define PV at vorticity grid and averaging adjacent density values, or alternatively, define PV at mass grid and averaging vorticity values nearby.  I cannot figure out which definition is better as different definitions may depend on the discretization and finite difference schemes used in the model.


------------------
 Best regards 
 
Yu-Kun Qian (钱钰坤) 
Center for Monsoon and Environment Research 
 Department of Atmospheric Sciences
School of Environmental Science and Engineering 
 Sun Yat-sen University 
No. 135 Xingang West Road, Haizhu District 
Guangzhou, 510275, P.R. China 
Tel; 020-84115227 
Email: qianyk at mail3.sysu.edu.cn      


 
 
 
------------------ Original ------------------
From:  "Jacob Wenegrat"<jwenegrat at stanford.edu>;
Date:  Fri, Jun 3, 2016 01:32 AM
To:  "mitgcm-support"<mitgcm-support at mitgcm.org>; 

Subject:  [MITgcm-support] Revisiting Online PV Diagnostics

 
Hi All,

I see reference a time or two in the mailing list archive to people 
either interested in online PV diagnostics, or playing around with 
implementing online PV diagnostics, and I wonder if anyone ever made any 
further progress on those topics?

In particular I am interested in closing a volume integrated PV budget 
in flux form. This seems to work reasonably well offline in a 2D 
configuration, but fails at the onset of baroclinic instability in 3D runs.

I'm tending towards thinking that an online computation is the best 
possible approach, but would welcome any advice, suggestions, warnings, 
etc. from those more experienced with these issues.

Cheers,
Jacob

-- 
Jacob Wenegrat
Postdoctoral Fellow
Dept. of Earth System Science
Stanford University

Email: jwenegrat at stanford.edu
Web: http://web.stanford.edu/~jacob13



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