[gradsusr] Calculating Wet-Bulb Temperature

[Perry, Aaron @ LSC]

Thanks for the reply Jeff!


Going to research these papers and see if they can help.


Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA
Twitter: @AaronPerryLSC<https://twitter.com/AaronPerryLSC>
Web: shearanalytics.net<http://shearanalytics.net/>
Mobile: 617-780-4312
________________________________
From: gradsusr-bounces at gradsusr.org <gradsusr-bounces at gradsusr.org> on behalf of Jeff Duda <jeffduda319 at gmail.com>
Sent: Thursday, November 20, 2014 12:55 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Calculating Wet-Bulb Temperature

I"m not sure what particular formula you're using, but I typically rely on the Bolton (1980), MWR and Davies-Jones (2008), MWR papers on computing equivalent potential temperature and wet bulb potential temperature for these purposes.  Equations 3.3 and 3.4 in the latter reference give formulas for wet-bulb potential temperature as a function of equivalent potential temperature. The value of C in those equations is 273 K. Once you have theta-w, you can use the Poisson equation to derive the wet bulb temperature.

Jeff Duda

On Thu, Nov 20, 2014 at 11:13 AM, Perry, Aaron @ LSC <Aaron.Perry at lsc.vsc.edu<mailto:Aaron.Perry at lsc.vsc.edu>> wrote:

Good Afternoon All,


I'm currently in need of a way to correctly calculate Wet-Bulb Temperature.  I've been playing around with using Dew Point, Relative Humidity, and Surface Pressure but, it doesn't seem to be correct:


'define tc = (tmp2m.1-273.15)'
'define tdc = (dpt2m.1-273.15)'
'define e = 6.11*pow(10,7.5*tdc/(237.7+tdc))'
'define es = 6.11*pow(10,7.5*tc/(237.7+tc))'
'define rh = (e/es)*100'

'define pres = pressfc.1'

'define w2 = 0.622*(e/pres)'
'define wb = tc-(((((0.622*es)/pres)-w2)*2499)/(1.004+1.84*w2))'
'define wetbulb = (wb*(9/5)+32)'


Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA
Twitter: @AaronPerryLSC<https://twitter.com/AaronPerryLSC>
Web: shearanalytics.net<http://shearanalytics.net/>
Mobile: 617-780-4312

_______________________________________________
gradsusr mailing list
gradsusr at gradsusr.org<mailto:gradsusr at gradsusr.org>
http://gradsusr.org/mailman/listinfo/gradsusr




--
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20141121/60ee313b/attachment.html