<div dir="ltr"><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif">Hi Ahsan,</div><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif"><br>
</div><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif">As far as I know, in order to calculate dewpoint temperature, you need to have both temperature and relative humidity variables of that particular level. You, however, may use the following functions to do so at 2 meters above the ground:</div>
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<div class="gmail_default"><div class="gmail_default"><font color="#000000" face="tahoma, sans-serif">tc2m = temperature 2m above ground</font><span style="color:rgb(0,0,0);font-family:tahoma,sans-serif"> [°C]</span></div>
<div class="gmail_default"><font color="#000000" face="tahoma, sans-serif">rh2m = relative humidity 2m above ground</font><span style="color:rgb(0,0,0);font-family:tahoma,sans-serif"> [%]</span></div>
<div class="gmail_default"><font color="#000000" face="tahoma, sans-serif"><br></font></div><div class="gmail_default"><div class="gmail_default"><font color="#000000" face="tahoma, sans-serif">'define dewp2m = tc2m-((14.55+0.114*tc2m)*(1-0.01*rh2m)+pow((2.5+0.007*tc2m)</font></div>
<div class="gmail_default"><font color="#000000" face="tahoma, sans-serif"> *(1-0.01*rh2m),3)+(15.9+0.117*tc2m)*pow((1-0.01*rh2m),14))'</font></div></div></div><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif">
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<br></div><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif">Good luck!</div><div class="gmail_default" style="font-size:small;font-family:tahoma,sans-serif">
Mohsen</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><span><span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif";color:#888888"></span></span><span><span dir="RTL" style="font-size:11.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#888888" lang="AR-SA"><span></span></span></span>--<div>
<span style="font-family:arial;font-size:12px;background-color:rgb(255,255,255)"><font color="#274e13">April showers bring May flowers!</font></span><br></div><div>--<font color="#b45f06"> <br>
<b>Mohsen Soltani, M.Sc.</b><br>Climatology Grad Student,<br>Department of Climatology, Faculty of Geography,</font></div><div><font color="#b45f06">University of Tehran, </font><span style="color:rgb(180,95,6)">Tehran, Iran</span></div>
<div><font color="#b45f06">voice: (+98) 9119772934<br>e-mail</font><font color="#bf9000">:</font> <a href="mailto:soltani.clima@gmail.com" target="_blank">soltani.clima@gmail.com</a><br></div></div></div>
<br><br><div class="gmail_quote">On Fri, Aug 9, 2013 at 7:46 AM, Syed Ahsan Ali <span dir="ltr"><<a href="mailto:ahsanshah01@gmail.com" target="_blank">ahsanshah01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><div><div><div><br clear="all"></div>I want to calculate Dew point temprature from Relative humidity or Specific humidity.<br></div>Anyone know how to calculate within grads.<br></div>Thanks <br></div>
<span class="HOEnZb"><font color="#888888">Ahsan<br>
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