Radiative Effects On Torrential Rainfall During The Landfall Of Typhoon Fitow

Cloud microphysical and rainfall responses to radiative processes are examined through the analysis of sensitivity cloud-resolving model experiments of Typhoon Fitow during the landfall. The simulation of model domain mean rain rate in the control experiment is compared with the observed rain rate and the comparison shows a fair agreement. The budget analysis shows that increase in the mean rainfall caused by the exclusion of radiative effects of water clouds corresponds to the decrease in accretion of raindrops by cloud ice in the presence of radiative effects of ice clouds, but the rainfall is insensitive to radiative effects of water clouds in the absence of radiative effects of ice clouds. The increases in the mean rainfall resulting from the removal of radiative effects of ice clouds correspond to the enhanced net condensation. The increases (decreases) in maximum rainfall caused by the exclusion of radiative effects of water clouds in the presence (absence) of radiative effects of ice clouds or the removal of radiative effects of ice clouds in the presence (absence) of radiative effects of water clouds correspond mainly to the enhancements (reductions) in net condensation.The mean rain rate is a product of rain intensity and fractional rainfall coverage. The radiation-induced difference in the mean rain rate is related to the difference in rain intensity. The radiation-induced difference in the maximum rain rate associated with the difference in fractional coverage of maximum rainfall.