Current climate models parameterise clouds and atmospheric water is treated as a “Greenhouse Gas” when it exists in the atmosphere as gas, liquid and solid. The solid phase is a key factor in the formation of reflective clouds. These phases are all responsive to surface temperature at the base of the atmospheric column and surface pressure to a much lesser degree in the observed range. The atmospheric gear change around 45mm TPW is not a simple process that can be emulated with a few cloud parameters.
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