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Vertical Integration formula


New member
Hi WRF community,

I was looking for how to vertically integrate variable in WRF (such as integrating QVAPOR to get integrated water vapor [IWV] ).
I have done some searching and came across the paper

CORDEX-WRF v1.3: development of a module for the Weather Research and Forecasting (WRF) model to support the CORDEX community

They provided the formula (equation 21)

Because I do not seem to find other topics or discussion on this, I want to ask if this is the correct integration formula?