By using 7-year (Data time series from May 2006 to May 2013) CloudSat observations, occurrence frequencies of 8 cloud types for different levels and seasons over the Qinghai-Tibetan Plateau are constructed to examine characteristics of their horizontal and vertical distributions and related physical causes, which could provide observational information for evaluating cloud simulated by numerical weather prediction models.It is found that the frequency of total cloud occurrence is about 35%.Among low, middle and high clouds, the highest frequency is low cloud near 21%, followed by middle clouds about 14%, and the lowest one is high cloud less than 1%.In terms of vertical structure, the maximum frequency of low clouds at a height of 5~6 km, 7~8 km for middle clouds and 11~12 km for high clouds.High frequency of total cloud occurrence is located in the Southeast and Northwest parts of the Qinghai-Tibetan Plateau which forms two centers of relatively plentiful clouds.The spatial distribution of low cloud frequency is consistent with that of total clouds, middle cloud frequency is high in the north and middle Plateau and low in the South Plateau which is obviously different with low cloud and on the other hand, high cloud frequently occurs in the South Plateau.For seasonal variation, in terms of high frequency of occurrence, during winter low cloud is over the west Plateau; During spring middle cloud over the middle north part and low clouds over the west and southeast; During summer high and low clouds over the south of the Plateau.There is very low occurrence frequency for all kinds of clouds during fall.It was indicated that the formation of low clouds is mainly due to orographic uplift, and middle clouds largely associated with the thermos-dynamical effects of the Plateau.
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