tvrh2q(tvexpr,rhexpr)
Given virtual temperature and relative humidty, tvrh2q
returns specific humidity, q, in g/g. Specifically:
tvexpr
A GrADS expression that represents virtual temperature, in Kelvin.
rhexpr
A GrADS expression that represents relative humidty, in percent
(values from 0 to 100).
This function works only on gridded data.
tvrh2q
assumes that the Z coordinate system is pressure in mb. If Z is a varying
dimension, the pressure valid at each grid point is used. When Z is a
fixed dimension, the Z value from the current dimension environment is
used.
Note that it is possible to provide values from an incorrect pressure level by overriding the current dimension environment:
In this case, the tvrh2q
function assumes a pressure of
500mb, which is the current setting for the Z dimension
environment. However, tvexpr
and
rhexpr
are providing data from the 850mb level,
so the function will produce incorrect results.