[gradsusr] How to compute moisture flux convergence in grads?

[lpasmanoranjan]

Dear GrADS users,
I would like to ask you a favour.

I would like to compute moisture flux convergence at a grid point at a
given pressure level and a given time.  I have u-wind, v-wind and specific
humidity.

Can anybody please help me how to compute it? I have written a script. I
don't know whether it is a correct way?

'open u-wind.ctl'
'open v-wind.ctl'
'open q.ctl'

'set lev 850'
'set t 1'

'define qu=u.1*q.3'
'define qv=v.2*q.3'
'define divqV=hdivg(qu,qv)'

'set lat 23'
'set lon 78'
'd divqV'


Thank you, in advance, for any kind of help of suggestion in this regard.
-- 
Kind Regards,
Mano
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