Impacts Of Cloud-Radiative Forcing On Tropical Cyclone

To investigate the impacts of the cloud-radiative forcing (CRF) on tropical cyclones (TC) structure and size, a set of sensitivity simulations were conducted by using high-resolution Weather Research and Forecasting (WRF) model (WRF-ARW). The results show that mainly by changing the tropical cyclone radiation distribution, CRF has effect on convective activity, as well as tropical cyclone structure and size. In the case considering the CRF effect, during the TC development stage, the strong cooling along the anvil top and weak warming in the cloudy regions under the forcing of cloud and radiation could reduce the static stability (especially at the middle-upper levels), by which convective activity of the tropical cyclone would be enhanced by CRF. The tropical cyclone develops faster and has a larger size in the case with CRF than without CRF.Meanwhile, some sensitivity experiments of CRF on the different cloud microphysics schemes are conducted. The results show a similar evolution characteristics of TC development and structure. In view of the considerable impacts of CRF on the size and strength of tropical cyclone, it is required to pay more attention on CRF in the numerical prediction of tropical cyclone.