摘要
应用湿位涡理论对 1 996年 1月 1 6日～ 1 9日青藏高原东部大雪过程进行了诊断分析 ,结果表明 :降雪前期 ,暖湿空气发展 ,降雪时从 50 0 h Pa到 2 0 0 h Pa有强烈深厚的垂直涡旋运行和湿空气斜压性强是雪量大的重要原因。大降雪中心位于MPV1 零线西侧强梯度带的正值区内 ,它也位于 MPV2 零线北侧强梯度带的负值区内。冬季在对流稳定层结下 ,当 MPV2 值为负时 ,垂直涡度才能得到较大的增长 ,导致上升运动 。
The heavy snow which burst out over the eastern Qinghai\|Xizang Plateau on Jan 16~19, 1996, is studied by using the theory of moist potential vorticity. The results show that the severe, warm and moist air current before the snow and the deep normal vorticity motion from 500 hPa to 200 hPa and the heavy baroclinicity duration of the snow were the impotant reasons of the heavy snow. The results also show that the centre of the heavy snow lay in the positive area to the western severe gradient of MPV 1 zero line and also in the negative area to the northern severe gradient of MPV 2 zero line.
出处
《甘肃科学学报》
2001年第3期43-46,共4页
Journal of Gansu Sciences
基金
国家自然科学基金项目 (4 9765 0 1 1 )
