Convert specific humidity to relative humidity
w_spechum2relhum(f_spechum, f_temp, f_atm)
a file of relative humidity, ratio of actual water mixing ratio to saturation mixing ratio
file of specific humidity, dimensionless (e.g. kg/kg) ratio of water mass / total air mass
file of temperature degrees C
file of atmospheric pressure in mb
P. Chevallier - Nov 2022
Converting specific humidity into relative humidity. from Bolton 1980 The computation of Equivalent Potential Temperature