高原低涡东移过程的水汽图像

通过对1998年8月3-5日水汽图像分析发现；（1）对流层中，上部水汽涡旋的出现，东移、消失对高原低涡的形成，东移、消失有指示意义。（2）与高原低涡相伴的水汽涡旋的东移，变化与贝加尔湖东南部低压所伴有的气旋水汽带的东移，变化是密切相关的，（3）高原低涡的形成与印度洋，阿拉伯海，印度有大范围强水汽向东北输送到高原有关，在向北输送的水汽减弱时，青藏高原地形对水汽输送的屏障作用是明显的。

Water Vapor Imagery of Vortex Miving Process over

The water vapor imagery from 3 to 5 August 1998 vras analyzed, the results are as follow: (1) The forming, moving, disappearing of low vortex over Qinghai-Xizang Plateau was pointed by the ap- pearing, moving, disappearing of water vapor vortex in the middle and upper troposphere. (2) The moving to east and change of the vapor over Qinghai-Xizang Plateau vortex is associated with the low pressure in the southeast Baykal lake. (3) The formation of Plateau vortex is associated with the strong vapor trans- porting to the south west of Plateau from Indian Ocean, Arabian Sea and India. When the water vapor of transporting northward is weakened, the Plateau topographic blocking action on transporting of water va- por is obvious.