摘要
对北疆2011年10月末的一次暴雪天气过程的成因进行了分析。结果表明:暴雪是由欧洲脊部分衰退、乌拉尔槽转竖东移进入新疆后形成的。热力、动力强迫激发的动力锋生机制产生的锋面次级环流是造成降水的直接中尺度系统。暴雪发生在MPV1>0且得到较大增长且MPV2绝对值较大增长、等θe线密集的区域。MPV的分布结构,促进了垂直涡度的较大增长,有利于暴雪的产生和增强。高、低空急流对水汽的输送、次级环流的发展维持和水汽的抬升凝结有重要贡献。
The cause of a snowstorm process over the northern Xinjiang in October 2011 is analyzed in this paper. The results show that the snowstorm was formed when the European ridge declined and Urals trough moved into Xinjiang; the secondary circulation caused by the dynamic frontogenesis mechanism with thermal force and dynamic force directly generated the mesoscale system for the snowstorm; the snowstorm happened in the area where MPV1 was above 0 and growed obviously while the absolute value of MPV2 also got big growth, and 0e lines were dense; the MPV distribution structure promoted the large growth of vertical vorticity, which was beneficial to the generation and strenthening of snowstorm. High and low-level jet made great contribution to water vapor transfer, the development of circulation and water vapor condensed.
出处
《沙漠与绿洲气象》
2013年第2期9-14,共6页
Desert and Oasis Meteorology
基金
科技部公益性行业(气象)科研专项(GYHY201106007)资助
关键词
暴雪成因
次级环流
不稳定条件
水汽输送
高低空急流
snowstorm cause
secondary circulation
instability condition
vapor transfer
high andlow-level jet
