Title

Role of microphysical parameterizations with droplet relative dispersion in IAP AGCM 4.1

Authors

Xie, XN ; Zhang, H ; Liu, XD ; Peng, YR ; Liu, YG

Abstract

Previous studies have shown that accurate descriptions of the cloud droplet effective radius (Re) and the autoconversion process of cloud droplets to raindrops (Ar) can effectively improve simulated clouds and surface precipitation, and reduce the uncertainty of aerosol indirect effects in GCMs. In this paper, we implement cloud microphysical schemes including two-moment Ar and Re considering relative dispersion of the cloud droplet size distribution into version 4.1 of the Institute of

Atmospheric Physics’s atmospheric GCM (IAP AGCM 4.1), which is the atmospheric component of the Chinese Academy of Sciences’ Earth System Model. Analysis of the effects of different schemes shows that the newly implemented schemes can improve both the simulated shortwave and longwave cloud radiative forcings, as compared to the standard scheme, in IAP AGCM 4.1. The new schemes also effectively enhance the large-scale precipitation, especially over low latitudes, although the influences of total precipitation are insignificant for different schemes. Further studies show that similar results can be found with the Community Atmosphere Model, version 5.1.

Corresponding author

Xie Xiaoning

Volume

35

Issue

2（SI）

Page

248-259

Pub year

2018

Publication name

ADVANCES IN ATMOSPHERIC SCIENCES

Details

https://link.springer.com/article/10.1007%2Fs00376-017-7083-5