Re: Possible bug in wrf_td fuction

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Thu May 26 2011 - 14:03:10 MDT

Hi Michael,

This question is more appropriate for wrfhelp. I've CC'ed them on this message.


On May 26, 2011, at 1:02 PM, Michael J Murphy wrote:

> The Problem:
> I have been using the wrf_usr_getvar function to calculated and plot dew point temperature from WRF-ARW output (and input) files. When plotting the dew point temp in vertical profiles I have found strange behavior in the upper atmosphere (near 100 mb). This strange behavior includes the same value of dew point temp (approx -80 degrees Celsius) at numerous sigma levels. The relative humidity extracted with the wrf_usr_getvar function does not show the supersaturations implied by these strange dew point temp reading in the upper atmosphere.
> Error Messages:
> There is no error message associated with this problem.
> My Thoughts:
> The wrf_usr_getvar seems to call the wrf_td function for its dew point temperature calculation. I have been unable to locate the source code for this wrf_td function but suspect this is the source of the strange dew point temp values.
> Background Info:
> 1) Name of WRF data file: wrfinput_d01--bug-wrf_td.gz (NOTE: I am giving the wrfinput file because it is smaller and has the same issue as the wrfout file)
> 2) Name of NCL scripts: plot-dewpt--bug-wrf_td.ncl & plot-rh--bug-wrf_td.ncl
> 3) NCL version: 5.2.1
> 4) uname -a: Linux fe-inform 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
> MJ
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Received on Thu May 26 14:03:19 2011

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