Analysis Of Radiative Forcing Of Cloud Over Tibetan Plateau By Cloudsat Data

Cloud-radiation interaction is an important factor of uncertainty in climate change research. Obtaining information of clouds with different heights and its impact on the radiation budget, is necessary to the study of global climate change. Cloudsat is the first satellite for the study of cloud. We can see the vertical structure of the global clouds and get microphysical characteristics of clouds by using it. Through this process, we can better understanding the cloud-climate feedback in climate change research and thus reduce uncertainty.In this paper, we analysed the total cloud amount and cloud radiative forcing, by using cloud type and cloud radiative forcing data provided by Cloudsat and cloud amount data from CERES_SSF. The conclusions suggest that, the clouds amount over Tibetan Plateau gradually increased carried on monsoon winds, and in August, the clouds amount reaches maximum. Due to the effect of landforms of Plateau, the clouds amount over Southern Plateau is much great then Northern. In the high cloud amount area, the absolute value of Short Wave cloud radiative forcing at TOA and BOA are also higher and low amount area.We also used atmosphere heating data from Cloudsat, and selected out three example of cloud over Tibetan Plateau, corresponding to single clouds, multi-layer clouds and various types of clouds. The results showed that:clouds heat the atmosphere via absorption of SW radiation inside the cloud. The single clouds cool the atmosphere by emission LW radiation near the top of cloud layers and heat the atmosphere due to the 'green house' effect. Multi-layer clouds have an obviously cooling effect on net heating rate and the maximum is close to cooling rate near the top of cloud. The heating rate of different kinds of cloud can be treated as the sum of these kinds of single-layer clouds in vertical distribution.