[gradsusr] Calculating Wet-Bulb Temperature

[Jeff Duda]

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> 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*
>
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>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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