高空西风急流对两次北方暴雪的影响机制分析  

Analysis of the Impact of Upper-Level Westerly Jet on Two Snowstorms in North China

作　　者：周旋 孙即霖[1] 时晓曚 ZHOU Xuan;SUN Jilin;SHI Xiaomeng(Physical Oceanography Laboratory&Ocean-Atmospheric Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100,China;Qingdao Meteorological Bureau,Qingdao 266003,China)

机构地区：[1]中国海洋大学物理海洋实验室海洋-大气相互作用与气候实验室,山东青岛266100 [2]青岛市气象局,山东青岛266003

出　　处：《海洋湖沼通报》2020年第1期26-35,共10页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金(41276012);国家自然科学重点基金(41430963)资助。

摘　　要：利用NECP 6h再分析资料,对2009年初秋山西暴雪和2010年隆冬北京暴雪进行了诊断分析。研究发现:两次暴雪都与高空西风急流的影响密切相关。高空西风急流出口区左侧的上升运动是山西出现暴雪的重要因素,而高空西风急流出口区左侧的上升气流通过影响地面气旋发展,气旋中心以东外围气流沿锋面上升运动加强,导致北京暴雪发生。垂直方向上,与山西暴雪相关的上升运动主要出现在大气中、高层,呈深厚系统特征,而与北京暴雪相关上升运动区主要在大气低层。高空西风急流引起的两次上升运动与水汽输送条件的配合可作为北方暴雪预报中有价值的参考因素。The snowstorms over Shanxi in 2009 early autumn and over Beijing in 2010 winter are studied using reanalysis 6 h-interval data of NECP.Results show that these two storms were all close related to the upper level westerly jet.Snowstorm over Shanxi occurred at the left side of exit area of the westerly jet corresponding to obvious upward movement.The the upward movement of the snowstorm over Beijing was due to the development of 1000 hPa level cyclone favored by the left side of exit area beneath westerly jet.Wind strengthened the upward movement forced by front east of cyclone center.The ascending motion of Shanxi snowstorm was in the middle and upper troposphere while the ascending motion of Beijing snowstorm was limited to lower level troposphere.The match of affection from westerly jet and water vapor transportation will be more important in snowstorm prediction in the North China.

关 键 词：高空西风急流 垂直运动 山西暴雪 北京暴雪 

分 类 号：P422[天文地球—大气科学及气象学]