[Wrf-users] Transforming eta levels to p levels

[Alex Fierro]

If you go to:

 http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Tools/p_interp.htm

you will  be able to download the p_interp program, which interpolates
WRF.out data to (user defined) pressure levels and dump the data in NETCDF
format. If simulations are conducted over areas with little-to-no terrain,
then I'd advise you to write your own code and use the following to convert
to Z(km) e.g.,:

 ph_tmp = ( (ph_tmp+phb_tmp) / 9.81)/1000.

as provided in module_interp.f90 of ARWpost.

Cheers,
-- 
-------------------------------------------------------------
Alexandre Fierro, PhD
Research Scientist-
National Severe Storms Laboratory (NSSL/NOAA)
*The Cooperative Institute for Mesoscale Meteorological Studies* (OU/NOAA)
Los Alamos National Laboratory, Los Alamos, NM (LANL)

"Yesterday is History, Tomorrow is a Mystery and Today is a Gift; That is
why it is called the Present"

"There are only 10 types of people in the world:
Those who understand binary, and those who don't"

"My opinions are my own and not representative of OU, NSSL,
AOML, HRD, LANL or any affiliates."
         ^.^
       (o  o)
     /(   V   )\
   ---m---m----


On Thu, May 22, 2014 at 1:42 PM, Eric Altshuler <ela at cola.iges.org> wrote:

> The best way to do vertical interpolation of WRF output is to use one of
> the postprocessing tools. These include ARWpost (for WRF-ARW only), UPP
> (ARW and NMM), NCL and RIP. If you're running WRF-ARW, then ARWpost is
> probably the easiest to use, although the others can calculate many more
> diagnostic fields.
>
> Best regards,
>
> Eric L. Altshuler
> Research Scientist
> Center for Ocean-Land-Atmosphere Studies
> 253 Research Hall, Mail Stop 6C5
> George Mason University
> 4400 University Drive
> Fairfax, VA 22030 USA
>
> E-mail: ela at cola.iges.org
> Phone: (703) 993-5725
> Fax: (703) 993-5770
>
>
> ------------------------------
> *From: *"孙佳" <sunjiaouc at sina.com>
> *To: *"wrf-users" <wrf-users at ucar.edu>
> *Sent: *Wednesday, May 21, 2014 9:21:28 PM
> *Subject: *[Wrf-users] Transforming eta levels to p levels
>
> Dear all,
>
> I was doing the wrfout data analysis in MATLAB. Data in "wrfout_*"
> files are constructed in eta levels, and this is not convinient for
> atmosphere analysis.
>
> with the following formula,  I get eta values but different from those in
> namelist files.
>                         eta = (P0-P_TOP)/(PSFC-P_TOP)    where P0=P+PB,
> and P PB PSFC P_TOP are all variables in wrfout_d* files
>
> So, I am not sure that it is right if I use P0 = P+PB to do the p_level
> interpretion.
>
> Can you give me some advise? I will be very appreciate about it!
>
> Thank you all!
>
>
> 2014-05-22
> ------------------------------
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