Integrated Water Vapour

Integrated Water Vapour (IVV) is the total amount of water vapor present in a vertical atmospheric column. Considering the density of liquid water, the IWV expressed in kg/m2 is equivalent to the Total Precipitable Water (TPW) expressed in mm of liquid water. Strictly speaking, however, not all the water vapor is actually precipitable.


WMO. Details for Variable: Integrated Water Vapor (IWV) [Internet]. WMO OSCAR. 2021 [cited 2021 Aug 17]. Available from:

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