9:45 AM - 10:00 AM
[AAS04-04] Diurnal cycle of precipitation over maritime continent using different in-cloud parameterizations
Keywords:cumulus parameterization, diurnal cycle of precipitation, maritime continent
To validate effect of in-cloud parameterization in cumulus parameterization on the diurnal cycle of precipitation, two different in-cloud parameterizations (new scheme developed in Baba 2017 and one used in IFS/ECMWF) were used, and regional atmospheric simulations focusing on the precipitation over maritime continent were performed. The results showed that phase of the diurnal cycle was well reproduced compared to the reanalysis data regardless of in-cloud parameterizations, however, amplitude of the diurnal cycle was greatly affected by the difference in the in-cloud parameterization. Further analysis on the convective structure revealed that IFS’s parameterization simulated deeper convection than the new scheme simulated, and the new scheme simulated more coexistence of deep and shallow convection. These results suggested that phase of diurnal cycle is independent of the in-cloud parameterization but is considered to be dependent on other physical parameterizations, and dependence of the amplitude on the parameterization is significant because of the change in convective structure.