How to calculate Specific Humidity

[Javier G. Corripio]

You can also try:

q=0.622*e/P   (Sturm Met for S&E 5.4)  where e is vapour pressure

e=6.11*exp((17.2694*(T-273.16))/(T-35.86))   (Teten)  (T in K)

for a fixed level you can do (in a script, remove apostrophes for non script):

lev=850
'set lev 'lev
'define e=6.11*exp((17.2694*(tmpprs-273.16))/(tmpprs-35.86))'
* sh in in kg/kg
'define sh=0.622*e*(rhprs/100)/'lev
* sh in g/kg
'define sh=1000*0.622*e*(rhprs/100)/'lev

Now, if you want to compute a whole profile, I am not sure how to relate every variable to its
pressure level.  MAy be somebody else in the list could solve that.

Best,
J.