Dear Sir/Madam,<br><br>Happy New Year :)<br><br>thanks for your previous help. i am using CAM2WRF code to convert ccsm format to WPS intermediate format , the problem is that the ccsm doesn't have relative humidity (RH), and instead they have specific humidity (SPECHUMD) and i just replaced the RH with SPECHUMD in CAM2WRF code, and also my met_file does include SPECHUMD, but after running WRF the precipitation become zero . if this method is incorrect, could i calculate RH from specific humidity using this equation before running CAM@WRF code ( by assuming <span style="color:rgb(255,0,0)">constant</span> values for <em>ñ<sub>ws</sub></em><i> = density of water vapor</i><em> and ñ</em><i> = density of the moist or humid air (kg/m<sup>3</sup>)</i><i>)</i><br>
<blockquote>
<p><em>x = 0.622 ö ñ<sub>ws</sub> / (ñ - ñ<sub>ws</sub>) 100%</em><i> (1)</i></p>
<p><i>where</i></p>
<p><em>x</em><i> = specific humidity of air vapor mixture (kg/kg)</i></p>
<p><em>ö</em><i> = relative humidity (%)</i></p>
<p><em>ñ<sub>ws</sub></em><i> = density of water vapor (kg/m<sup>3</sup>)</i></p>
<p><em>ñ</em><i> = density of the moist or humid air (kg/m<sup>3</sup>)</i></p>
</blockquote><br>I appreciate your help in advance.<br><br><br>Best Regards,<br><br><br>Ehsan Beigi<br><br><br><br><br><div class="gmail_quote">On Thu, Dec 29, 2011 at 6:48 PM, Ehsan Beigi <span dir="ltr"><<a href="mailto:ebeigi3@tigers.lsu.edu">ebeigi3@tigers.lsu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Thanks for your help. my met_file does include SPECHUMD(please take a look at attach files), but in the CAM2WRF code, i just replaced the RH with SPECHUMD that you mentioned it is incorrect, this code only convert the format from ccsm to wps intermediate format, could you please help me with that? i also attached the CAM2WRF code , you can see how i changed RH with SPECHUMD ? thanks again<br>
<br><br>Best Regards,<div><div></div><div class="h5"><br><br><br><br><br><br><div class="gmail_quote">On Thu, Dec 29, 2011 at 11:48 AM, wrfhelp <span dir="ltr"><<a href="mailto:wrfhelp@ucar.edu" target="_blank">wrfhelp@ucar.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
If there is no RH, then you should include SPECHUMD in your met-em
file. When real.exe is running, it will calculate QVAPOR based on
SPECHUMD. It is incorrect to change SPECHUMD to be RH. <br><div><div></div><div>
<br>
On 12/27/2011 1:27 PM, Ehsan Beigi wrote:
<blockquote type="cite">
<br>
Thanks for your help and Merry Christmas again! you mentioned a
good point about zero precipitaion, the problem is that the ccsm
input data doesn't have RH, and they only have specific humidity
(SPECHUMD) instead , so i had to rename the RH in CAM2WRF code to
SPECHUMD , and as a result, in my met_em* files i don't have RH
which i think it leads to zero precipitation, i attahced the
ncdump -h output of my met_em file and also, the specific humidty,
could you please take a look at it, and help me with that?, i
really appreciate your help, and my research have been stopped at
this point for more than three months because of this problem.<br>
<br>
Bests,<br>
<br>
<br>
<br>
-- <br>
<span></span><i><span>Ehsan Beigi</span></i><br>
<i><span>PhD Student</span></i><br>
<i>Department of Civil and and Environmental Engineering<br>
<span>2408 Patrick F. Taylor Hall<br>
Louisiana State University<br>
Baton Rouge, LA, 70803</span></i><br>
<br>
<br>
</blockquote>
<br>
</div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br><span style="color:rgb(0,0,0)"></span><i><span style="color:rgb(102,102,102)">Ehsan Beigi</span></i><br><i><span style="color:rgb(102,102,102)">PhD Student</span></i><br>
<i style="color:rgb(102,102,102)">Department of Civil and and Environmental Engineering<br><span style="font-size:9pt">2408 Patrick F. Taylor Hall<br>
Louisiana State University<br>
Baton Rouge, LA, 70803</span></i><br><br><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><span style="color:rgb(0,0,0)"></span><i><span style="color:rgb(102,102,102)">Ehsan Beigi</span></i><br><i><span style="color:rgb(102,102,102)">PhD Student</span></i><br>
<i style="color:rgb(102,102,102)">Department of Civil and and Environmental Engineering<br><span style="font-size:9pt">2408 Patrick F. Taylor Hall<br>
Louisiana State University<br>
Baton Rouge, LA, 70803</span></i><br><br><br>