[AAS02-P07] Sensitivity studies of cloud responses on SSTs in RCE experiments using a high-resolution global nonhydrostatic model
It is found that amounts of high cloud increase as associated with the increase of SST in the simulations with different cloud microphysics schemes, although the heights of high clouds and detrainment speeds near the convective region depend on microphysics schemes used. The responses of the amount of high cloud are consistent with those of the tropical cloud of the study of Satoh et al. (2012) based on the global simulations. However, the response of the amount of high cloud in simulations with higher vertical resolutions vary with cloud microphysics schemes, although the heights of high clouds and detrainment speeds near the convective region are similar to those of simulations with relatively lower vertical resolutions. These results indicate that differences of properties of clouds such as effective radii of hydrometeors and their dependencies for the vertical resolution are possible cause of variations of the response of clouds to climate changes. In addition, they suggest the possible existence of uncertainties of the results of studies based on the simulations with conventional GCMs which do not consider the microphysical properties.