[MITgcm-support] initial velocity field for staggered grid

[钱钰坤]

Hi all,

I setup a regional run using OBCS.  The initial conditions (ICs) includes U, V, T, and S.  I notice that the model is defined on C-grid (staggered grid).  Therefore, the ICs of T and S can be specified on cell grids (first longitude = lon_low + resolution / 2).  For zonal velocity U, however, they are defined on face grids  (first longitude = lon_low).  Do I need to prepare the face-grid IC for U which is different from cell-grid IC for T and S?  If yes, then I think that there should be Nx+1 U grids (one more than the cell grids Nx) but in fact IC of U contains only Nx grids (as example case shows).  Similar problem could be found for V (Ny).


I also notice that when specifying the OBCS, the west OBCS for T and S may be defined at lon_low + resolution / 2 while that for U should be defined at lon_low.  Has this to be taken into account when generating OBCS?  Does the OBCS at t0 exactly the same as IC? for different BCs? for different variables?



------------------
 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
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