Application of Morrison Cloud Microphysics Scheme in GRAPES_Meso Model and the Sensitivity Study on CCN’s Impacts on Cloud Radiation

In the present study, Morrison double-moment cloud microphysics scheme including mass and droplet number concentration of water ice clouds is implemented into Chinese mesoscale version Global/Regional Assimilation Prediction System (GRAPES_Meso). Sensitivity experiments different condensation nuclei (CCN) values are conducted to study impacts CCN on microphysical processes radiation in East China. The model evaluation shows that simulated liquid path (CLWP) consistent with National Center for Environment (NCEP) reanalysis, optical depth (COD) effective radius (Rc) agreement those Moderate Resolution Imaging Spectroradiometer (MODIS) datasets both regional distribution magnitudes. These comparisons illustrate effectiveness For period 8 12 October 2017, sensitivity show initial (CCN0) increasing from 10 3000 cm?3, maximum value daily average Rc decreases by about 63%, which leads a decrease cloud-rain conversion rate. Moreover, mixing ratio (qc) increases 133%, rain (qr) 44%, CLWP COD increase 100% 150%, respectively. This results 65% downward shortwave radiative forcing (CDSRF) when CCN0 cm?3 cm?3. indicates important properties effects.