天山北坡2次暴雪过程机理分析  

Mechanism Analysis of Two Class Blizzard Process in the North Slope of Tianshan Mountains

作　　者：庄晓翠[1,2] 李健丽[2] 李博渊[2] 李如琦 贾丽红 ZHUANG Xiaocui;LI Jianli;LI Boyuan;LI Ruqi;JIA Lihong(Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China;Altay Meteorological Bureau,Altay 83650,China;Xinjiang Meteorological Observatory,Urumqi 830002,China)

机构地区：[1]中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002 [2]阿勒泰地区气象局,新疆阿勒泰836500 [3]新疆气象台,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2019年第1期29-38,共10页Desert and Oasis Meteorology

基　　金：阿勒泰地区优秀人才创新支持计划项目;中央级公益性科研院所基本科研业务费(IDM2016001)共同资助

摘　　要：利用FNL及常规资料,对比分析了2010年2月22—24日(过程Ⅰ)和2015年12月10—13日(过程Ⅱ)天山北坡2次暴雪过程。结果表明,暴雪区上空θse锋区陡立和条件性对称不稳定及次级环流是形成暴雪的主要机制。不同点是:过程Ⅰ暴雪产生在西西伯利亚低涡底部强锋区上,南北支短波槽汇合的区域,冷高压为西北路径;过程Ⅱ是乌拉尔山大槽东移北收,冷高压为偏西路径;2次过程在温压的时间演变上有显著的区别。在高低空配置上也有明显的区别:过程Ⅰ 500 hPa以下为暖平流,以上为冷平流,低层为暖湿结构;过程Ⅱ 700 hPa以下为冷平流,700—600 hPa为暖平流,低层有湿冷空气锲入。过程Ⅰ暴雪区位于θse锋区上,锋区低层强,中高层弱;过程Ⅱ暴雪区位于θse锋区中后部,锋区低层弱,中高层强。水汽输送和输入量及比湿过程Ⅰ大于过程Ⅱ。Based on FNL 6 h reanalysis data and the conventional data,we compared and analyzed the 2 snowstorm process over the northern slope of Tianshan Mountains from 22nd to 24th on February 2010(The process I)and from 10th to 13rd on December 2015(The process II).The results show that the main mechanism of snowstorm formation are the front over the snowstorm area rising steeply and conditional symmetric instability and secondary circulation.The different characteristics is that the process I was generated over the strong front region of the low vortex in west Siberia,and where north-south short wave trough converges,and has cold high pressure from the northwest path;the process II was the Ural Mountains big trough east north mobiled,cold high pressure from west path;There is a significant difference between the two processes in the time evolution of the warm compaction.In the high altitude and low allocation also have obvious differences:The process I was the warm advection below 500 hPa,and cold advection above 500 hPa and the lower layer has warm and humid air.The process II was cold advection below 700 hPa and warm advection in the 700-600 hPa,wet cold air is wedged in the lower troposphere.The process II snowstorm area is located in the θse frontal zone,the lower zone is vigorous,Mid high is modestly.The snowstorm area of process II was located in the middle and rear part of the θse frontal zone,low frontal zone was modestly,mid-high is hard.Water vapor transport,input and specific humidity of the process I>The process II.

关 键 词：天山北坡 冷锋暴雪 热动力机制 对比分析 

分 类 号：P458.3[天文地球—大气科学及气象学]