Re: calculation of dbz and mdbz in ncl

Hi Jonathan,

You can actually look at the $NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl script to see how various WRF variables are derived.

Search for the line:

  if( variable .eq. "dbz" .or. variable .eq. "mdbz" ) then

and you will see a big block of code. You'll see that it uses several variables: T, P, PB, QVAPOR, QRAIN (to name a few).

This piece of code uses an internal built-in "wrf_dbz" function to do part of its calculations.

I'm not sure about convective rain and how it might be represented in a WRF file. I've CC'ed wrfhelp@ucar.edu.

--Mary

On Jun 3, 2010, at 1:34 PM, SMITH, JONATHAN WYNN. (GSFC-6133) wrote:

> Hello ncl talk
> I have questions about convection and reflectivity in ncl and WRF
>
> What WRF variables are used in the calculation of dbz and mdbz in ncl?
>
> I had a discussion with George Grell recently. I showed him mdbz model output (I used Lin mp_physics and New Grell cu_physics). He suggested I add convective rain. I do not see convective rain as a variable in WRF. Is he referring to QRAIN?
>
> Jonathan Wynn Smith
> Doctoral Student
> Howard University Program in Atmospheric Science
> and
> NASA - Goddard Space Flight Center - Co-Op
> Atmospheric Chemistry and Dynamics Branch
> Code 613.3
> Greenbelt, MD 20771
> 301-614-5956
> jonathan.smith@nasa.gov
> jw_smith@howard.edu
>
>
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Received on Thu Jun 3 16:00:05 2010