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<p class="MsoNormal"><span lang="DE-CH" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Hello people,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-CH" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-CH" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">I would like to plot a variable calculated from several wrf variables....for example, the following code....get temperature, pressure and relative
humidity and after I select tempC and relhum in 850 hPa... after calculate Theta E, I want to plot it, but when I execute the scripts it fails...what is wrong?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-CH" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-CH" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"<br>
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"<br>
begin<br>
a = addfile("./wrfout_d01_2016-05-24_18:00:00","r")<br>
wks = gsn_open_wks("X11","plt_Surface")<br>
<br>
<br>
tc = wrf_user_getvar(a,"tc",0)<br>
p = wrf_user_getvar(a,"pressure",0)<br>
rh = wrf_user_getvar(a,"rh",0)<br>
pressure = 850.<br>
res = True<br>
<br>
tempC = wrf_user_intrp3d(tc,p,"h",850.,0.,res)<br>
relhum= wrf_user_intrp3d(rh,p,"h",850.,0.,res)<br>
<br>
pltres = True<br>
mpres = True<br>
<br>
opts = res<br>
opts@cnFillOn = True<br>
opts@cnLevelSelectionMode = "ExplicitLevels"<br>
<br>
;-----------------------------------------<br>
; Calculate Theta E<br>
;-----------------------------------------<br>
<br>
<br>
undef("calc_thetae")<br>
<br>
function calc_thetae(tempC,pres,relhum)<br>
<br>
local tempC, pres, relhum, tc, tk, pp, p0, rh, es, en, rv, rd, cp, kd, td, tl, thetal, thetae<br>
<br>
begin<br>
pres = 850.<br>
Tc = tempC ; [C]<br>
tk = tempC+273.15 ; [K]<br>
pp = pres ; [hPa]<br>
p0 = 1000 ; [hPa]<br>
rh = relhum/100 ; [no dimensions]<br>
es = 6.112*exp(17.67*Tc/(Tc+243.5)) ; [hPa]<br>
en = rh*es ; [hPa]<br>
rv = 0.622*en/(pp-en) ; [no dimensions]<br>
rd = 287.04 ; [J/kgK]<br>
cp = 1005.7 ; [J/kgK]<br>
kd = rd/cp ; [no dimensions]<br>
tl = (1/((1/(tk-55))-(log(rh)/2840)))+55 ; [K]<br>
thetal = tk*((p0/(pp-en))^kd)*((tk/tl)^(0.28*rv)) ; [K]<br>
thetae = thetal*exp(((3036/tl)-1.78)*rv*(1+0.448*rv)) ; [K]<br>
thetae = thetae-273.15 ; [C]<br>
return(thetae)<br>
end<br>
<br>
contour_t2 = wrf_contour(a,wks,thetae,opts)<br>
<br>
plot= wrf_map_overlays(a,wks,(/contour_t2/),pltres ,mpres)<br>
<br>
end<br>
<br>
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal">Best<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Enric<o:p></o:p></p>
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<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Agud Pique, Enric
<br>
<b>Enviat:</b> dimarts, 24 / maig / 2016 21:17<br>
<b>Per a:</b> ncl-talk@ucar.edu<br>
<b>Tema:</b> get some variables from wrf output<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello people,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I would like to use wrf_user_getvar or another function in order to get from a wrf filet he following variables:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Temperature on 850 hPa-Level in ºC,<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Geopotential height on 850 hPa-Level
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Relative humidity on 850 hPa-Level
<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I know how to get the temperature on T2
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">T2 = wrf_user_getvar(a,"T2",0)<br>
</span>where a is the wrf file...but in 850hPa?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you<o:p></o:p></p>
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