ISSN 1006-9895

CN 11-1768/O4

The Stratiform cloud over the Eastern China Simulated by Two Versions of LASG/IAP Climate System models
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1.Climate Change Research center, Chinese Academy of Sciences;2.LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences

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    Abstract:

    The Eastern China, which is located in the leeside of Tibetan Plateau, is covered by stratiform cloud in winter. This kind of stratiform cloud is unique along the same latitudes of the global subtropical continent. A reasonable simulation of the stratiform cloud over the leeside of the Tibetan Plateau remains to be challenge for the current state of the art climate models. In this study, we compared the cloud properties and their radiative forcing at the top-of-the atmosphere from 2 IAP/LASG climate system models, FGOALS-s2 and FGOALS-g2, to observations from International Satellite Cloud Climatology Project (ISCCP). It is found that both two models underestimate the strength of short-wave cloud forcing, cloud water path and cloud fraction over Eastern China. FGOALS-s2 can reproduce the domination of low stratiform cloud over Eastern China, while FGOALS-g2 overestimates the proportion of high cloud. Such kind of bias in the simulation of stratiform cloud is related to the weak low tropospheric stability and insufficient moisture in low level. In addition, the overestimated average cloud top height in FGOALS-g2 is explained by the unrealistic updraft, which produces stronger vertical moisture transports over Eastern China.

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History
  • Received:November 02,2018
  • Revised:January 11,2019
  • Adopted:April 17,2019
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