# [ncl-talk] Calculation of Horizontal Moisture Flux Convergence

Atul Saini atulsainimail at gmail.com
Tue Aug 20 21:26:01 MDT 2019

```Thanks, I'll check it out.

On Wed, Aug 21, 2019, 08:39 Dennis Shea <shea at ucar.edu> wrote:

> This '*MFC* question' has been sent to ncl-talk in the past....several
> times!
> You should look at the archives.One *MFC* answer is here:
>
> *http://mailman.ucar.edu/pipermail/ncl-talk/2014-December/001686.html*
> <http://mailman.ucar.edu/pipermail/ncl-talk/2014-December/001686.html>
>
> Extracted from this response, is the expansion of  *DIV*(U*Q) within the
> integral into two separate components.
>
> >    *MFC = Moisture Flux Convergence*>>    *MFC_advect** = -( u*(dq/dx)+v*(dq/dy) )    ; advection term
> *>    *MFC_conv **  = -q*( (du/dx)+  (dv/dy) )    ; con(div)-vergence
> *>>    *MFC = MFC_advect + MFC_conv*
>
> *==========*
>
> I created two examples at:
>    *https://www.ncl.ucar.edu/Applications/wind.shtml* <https://www.ncl.ucar.edu/Applications/wind.shtml>
>
> *mfc_div_1.ncl *which implements the *DIV*(*v*q) form
> *mfc_div_2.ncl *which implements the components form.
>
> 'Luckily', they give the same 'answer'.
>
> Another example of implementing 'vector'/'divergence' operators/functions
> is just above these examples. See:: *wind_6.ncl*
> =========
>
> I suggest that you and others who are interested in
> 'budgets'/fluxes/vertical-integration' carefully read Dave Stepaniack's::*
> http://www.cgd.ucar.edu/cas/catalog/newbudgets/*
> <http://www.cgd.ucar.edu/cas/catalog/newbudgets/>
>
>
>
> On Fri, Aug 16, 2019 at 4:48 AM Atul Saini via ncl-talk <ncl-talk at ucar.edu>
> wrote:
>
>> Hi NCL-talk,
>>                        * Is there any function available in NCL to
>> calculate the Horizontal Moisture Flux Convergence?* Please have a look
>> at the method provided below and suggest the function in NCL-
>>
>> [image: image.png]
>>
>>
>>
>> Regards,
>>
>>
>>
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>
>
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