青藏高原低涡群发性的初步研究

The Preliminary Study on the Continuous Features of Tibetan Plateau Low Vortex Generation

在对1980～2004年青藏高原低涡统计分析的基础上，对高原低涡的群发性进行了研究，结果表明：青藏高原低涡的产生具有明显群发和间歇性特点，且这种特征具有显著的年际变化；高原低涡的群发和间歇时段．欧亚大气环流表现出明显不同的特征，不同的环流背景通过影响高原地区的低层涡度、散度、中高层湿度、高层散度和垂直速度，进而影响高原低涡的群发与间歇。

Basing on the statistical analysis of Tibetan Plateau low vortexes （PLV） from 1980 to 2004, the features of the PLV generate continuously was investigated. The results indicate that the PLV generate continuously or intermittently, and it has a interannual variation. When the PLV generate on continuous or intermittent phase, the atmospheric circulation over Eurasia are different. Under the different background of atmospheric circulation, the vorticity and divergence at low level, the humidity at middle - high level, the divergence at high level and the vertical velocity are distinct, and they are key factors that determine whether the generation of the PLV is continuously or intermittently.