Fundamental Investigation on Effects of Water Vapor Flux from Ground Surface on Rainfall Distribution

Abstract

As the first step for analysing the long term interaction between precipitation and soil moisture by coupling an atmospheric model and a runoff model in which soil moisture and evaporation are formulated, this study investigates effect of the water vapour flux from the ground surface into the distribution of precipitation. In this study, one-dimensional cumulus cloud model by Fritsch and Chappell and a warm rain model by Kessler are introduced into a mesoscale model developed by the authors, and the water vapour is assumed to be supplied from a certain area of the ground surface, specifying the amount of turbulent transfer at the lowest grid points.