[1] LWP is an important quantity in understanding radiative transfer in the atmosphere.
It is defined as the integral of liquid water content between two points in the atmosphere.
The liquid water path can be approximately retrieved from passive and active remote sensing such as microwave radiometer instruments, for example SSM/I.
Typical values of liquid water path in marine stratocumulus can be of the order of 20-80 g/m2.
[4] These connections are due to the proportionality between the liquid water path and the optical depth of the cloud.