**To**:**ferret_users@xxxxxxxx****Subject**:**[ferret_users] potential vorticity from OGCM****From**:**prescilla kurien <prescy@xxxxxxxxxxxxxxxxx>**- Date: Tue, 28 Jul 2009 21:16:20 +0900
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Dear ferret users: I am in need of calculating Potential vorticity from OGCM I have found the same topic by Mr. Paulo http://www.pmel.noaa.gov/maillists/tmap/ferret_users/fu_2001/msg00437.html But I am having OGCM results which is continuously stratified. The code I prepared is as below use 2014_hori_U_AM500_AH250.nc use 2014_hori_V_AM500_AH250.nc set region/X=78E:94E/Y=6N:23N/L=8/K=10 use density.nc LET zeta=(VVEL[d=2,x=@ddc])-(UVEL[d=1,y=@ddc]) ! relative vorticity let deg2rad=(2*3.14)/360 let omega = 7.292e-5 let f=2*omega*sin(deg2rad*Y[g=UVEL[d=1]]) !planetary V let rho_zero=1026 ! referece density let grad=DENSITY[z=@ddc] ! density gradient fill (grad*(zeta+f))/rho_zero But the plot looks strange for me. I think my code went wrong somewhere. If any of you have experience with vorticity calculation from continuously stratified ocean,kindly help me..Thanks in advance Prescilla

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