FY2C水汽通道资料反映的西藏高原水汽特征

Distribution of Water Vapor in Tibetan Plateau Analysed with FY-2C Water Vapour Image

利用2007～2009年逐时FY2C静止气象卫星水汽通道观测资料、T213垂直速度分析场分析了西藏高原水汽的空间分布，指出西藏高原有3条水汽通道，水汽来源来自孟加拉湾、南海和阿拉伯海。高原水汽日变化特点是昼弱夜强，与西藏地区降水昼晴夜雨的特征一致。地形影响水汽分布形式，进而影响降水分布特征，分析西藏高原降水分布时应该综合考虑这三者之间的联系。

Hourly FY2C water vapor channel geostationary meteorological satellite observations and T213 vertical velocity analysis field of the spatial distribution of water vapor over Tibetan plateau from 2007 to 2009 are analyzed. The result shows that the Tibetan plateau has three water vapor channel, they are moisture sources from the Bay of Bengal, the South China Sea and the Arabian Sea. Plateau vapor daytime diurnal variation is characterized by strong night and weak daytime, same as Tibetan precipitation characteristics consistent. The terrain effects the distribution of the water vapor, and then effect the rainfall . Rainfall distribution analysis of the Tibetan plateau should be taken into account when the link between these three characters.