[gradsusr] Calculation of zonal gradient

[Lyndz]

Dear GrADS-experts,

I am trying to calculate the zonal gradient of U-wind component using the
cdiff() function.
Below is part of the script that calculates this.


'define dx = cdiff(lon,x)*3.1416/180'
'define du = cdiff(u*cos(lat*3.1416/180),y)'
'define grad=(du/dx)*(6.37e6*cos(lat*3.1416/180))*1e-8'

 I would like to ask if this is correct. I am still confused how to get the
correct dx here.

I'll appreciate any help.

Sincerely,

--Lyndz
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