Because water vapor is a very important driver for many atmospheric processes, e.g. cloud formation, precipitation, radiative transfer, and convection, it is mandatory for any successful modeling of the atmosphere that the water vapor distribution is close to the real one.
(water vapor; is; a very important driver for many atmospheric processes) (it; is; mandatory) (the water vapor distribution; is; close to the real one)
water vapor it the water vapor distribution
is is is
a very important driver for many atmospheric processes
mandatory
close to the real one