利用20082010年7、 8月的CloudSat资料, 统计分析了青藏高原(下称高原)、 四川盆地及其过渡区域夏季降水云的宏微观物理特性和差异, 并结合FY-2D的TBB和台站降水资料进行个例分析, 深入探讨研究区域云物理特性的差异及其导致的降水差异.结果表明: (1)云宏观特性差异: 在7、 8月, 高原降水云以Cu和Ci主, 低云所占比例大于中云和高云, 过渡区和四川盆地降水云主要为Ns和Ci, 与四川盆地相比较, 高原云底高、 云顶低, 云的厚度薄, 对流较浅薄时便可降水.(2)云微观物理特性差异: 高原降水云以冰云为主, 混合相云次之, 水云最少, 四川盆地混合相云降水比例最大.统计时段多为云发展初期, 高原已有比四川盆地和过渡区云中的冰相粒子有效半径大、 谱宽较宽的趋势, 而数浓度相近, 利于冷云过程的发展, 四川盆地冷云降水过程启动较慢.
The statistical discrepancy of physical properties of summer precipitation clouds over the Qinghai-Xizang Plateau, Sichuan Basin and their transition region were analyzed, based on July and August CloudSat products from 2008 to 2010.At the same time, four examples from CloudSat, FY-2D TBB data and surface precipitation products were also analyzed to discuss how the different physical properties lead to the different precipitation of summer precipitation clouds over studying regions.The results showed that: (1) As to the macrophysical properties of clouds, the main precipitation clouds of the Qinghai-Xizang Plateau were Cu and Ci, low level clouds accounted for the largest proportion, it were Ns and Ci in Sichuan Basin and transition region.Compared with Basin, the clouds base was higher and top was lower in Plateau, it could rain while convection will not deep enough.In three regions, single layer cloud was easier to rain than multilayer one. (2) As for the microphysical properties of clouds, the main precipitation clouds of the Qinghai-Xizang Plateau was ice cloud, mixed cloud was second, the least was liquid water cloud, mixed cloud accounted for the largest proportion in Sichuan Basin.The clouds were mostly at the beginning of lifetimes in statistics, although the differences were not obvious, the effective radius and distribution width parameter of cloud ice particles over the Qinghai-Xizang Plateau were bigger and wider than those in the other two regions.Their number concentration were similarly, that could quicken the cold cloud processes.It was slower to developed ice cloud processes in Sichuan Basin than that in the Qinghai-Xizang Plateau.
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