2016年6月15—16日西藏雅鲁藏布江一线中到大雨降水天气分析

Analysis of Precipitation Weather in Tibet along the Yarlung Zangbo River Line from June 15 to 16,2016

利用常规资料,从环流背景场、不稳定能量、物理量场、卫星云图等方面,对2016年6月15—16日西藏雅鲁藏布江一线出现的一次强降水天气过程进行诊断分析。结果表明,欧亚中高纬经向环流强,中高层雅鲁藏布江一线深厚的切变线是此次降水的重要系统;中低空气旋的发展、冷平流的入侵及湿舌的西北方向伸展到雅鲁藏布江一线为此次降水提供动力条件和水汽条件;湿度层厚、对流有效位能大,且处在上干冷、下暖湿的大气环境下,为拉萨的强降水提供了有利条件。

Using the conventional data,a heavy precipitation process in Tibet along the Yarlung Zangbo River line from June 15 to 16,2016 was diagnosed and analyzed from the aspects of circulation background, unstable energy, physical field, satellite cloud image and so on. The results showed that the strong latitude longitude of Eurasian mid-high and the deep shear line of the middle and high-level lines in Tibet along the Yarlung Zangbo River line were important systems of this precipitation. The development of low-altitude cyclones, the invasion of cold advection and the northwest direction of the wet tongue extend to the Yangtze River provided power conditions and water vapor conditions for the precipitation. Humidity layer thickness ,large convection effective bit energy, and in the dry cold of upper layer and warm humid of lower layer atmosphere provided favorable conditions for the heavy precipitation in Lhasa.