[gradsusr] Calculating Dew point Temperature

[Syed Ahsan Ali]

Dear Mohsin

Thank you for your reply I want to plot tephigram and I don't have direct
model output of Dew point temperature. The tephigram script used these
parameters

'set lev 1000 50'
'sndtemp = T-273.16'
'snddewp = TD-273.16'
'sndspd = mag(u,v)'
'snddir = 57.29578*(ATAN2(U,V))+180'


How can I find dew point temperature from 1000 to 50 hpa from 2m
temperature.

Best Regards
Ahsan


On Fri, Aug 9, 2013 at 8:49 PM, Mohsen Soltani <soltani.clima at gmail.com>wrote:

> Hi Ahsan,
>
> 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:
>
> **************************
> tc2m = temperature 2m above ground [°C]
> rh2m = relative humidity 2m above ground [%]
>
> 'define dewp2m =
> tc2m-((14.55+0.114*tc2m)*(1-0.01*rh2m)+pow((2.5+0.007*tc2m)
>
>  *(1-0.01*rh2m),3)+(15.9+0.117*tc2m)*pow((1-0.01*rh2m),14))'
>
> ***************************************
>
> Good luck!
> Mohsen
>
> --
> April showers bring May flowers!
> --
> *Mohsen Soltani, M.Sc.*
> Climatology Grad Student,
> Department of Climatology, Faculty of Geography,
> University of Tehran, Tehran, Iran
> voice: (+98) 9119772934
> e-mail: soltani.clima at gmail.com
>
>
> On Fri, Aug 9, 2013 at 7:46 AM, Syed Ahsan Ali <ahsanshah01 at gmail.com>wrote:
>
>>
>> I want to calculate Dew point temprature from Relative humidity or
>> Specific humidity.
>> Anyone know how to calculate within grads.
>> Thanks
>> Ahsan
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>


-- 
Syed Ahsan Ali Bokhari
Electronic Engineer (EE)

Research & Development Division
Pakistan Meteorological Department H-8/4, Islamabad.
Phone # off  +92518358714
Cell # +923155145014
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20130810/030fefff/attachment-0003.html