[gradsusr] Advection term in the moisture convergence equation

Lyndon Mark Olaguera olagueralyndonmark429 at gmail.com
Sat Jan 28 00:35:17 EST 2017


Dear All,

I'm trying to calculate the moisture flux convergence using the following
commands:

*At 850 mb

'set dfile 1'
'define q=shum(z=3)'

'set dfile 2'
'define u=uwnd(z=3)'

'set dfile 3'
'define v=vwnd(z=3)'

'color -0.2 0.2 0.02 -kind blue->white->red'
'define mconv=(1)*hdivg(u*q,v*q)*1e6'

According to this link, I have to add the advection term.

http://www.spc.noaa.gov/publications/banacos/mfc-sls.pdf

[image: Inline image 1]

Question:

1. Is there a way to do this in grads?
2. Or is there a function in GRADS that can calculate partial derivatives?

I'll appreciate any help.

Best,

*Lyndon Mark P. Olaguera*
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