摘要
本次试验发现,在青藏高原的东北边缘,低涡的生成与地形和高低层系统的活动关系密切,去除地形后低涡不再出现。当低层副热带高压势力较强,整个高原的东部吹偏南风,高原东北部处在高空急流的辐散场中,易有低涡出现。非绝热因子可使高空槽减弱,使低涡停滞少动。
Numerical experiments show that on the northeastern edge of the Qinghai—Xizang Plateau the formation and movement of a vortex is closely related to topography and the activities of high—and low—level systems. After the removal of topography, the vortex would no longer exist. When the low—level subtropical high is powerful in intensity, the southerly wind prevails all through the eastern part of the plateau and its northeastern part is within the divergence field of the upper—air jet stream with vortex easily occurring. The factor of the non—adiabatic change can weaken the upper trough and make the vortex stagnant.
出处
《南京气象学院学报》
CSCD
1993年第2期226-232,共7页
Journal of Nanjing Institute of Meteorology
关键词
西北涡
高空急流
高空槽
大气
NW vortex,upper—air jet stream,upper trough
