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 13:02:46 2011
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