摘要
利用NCAR／NCEP再分析资料，以及MICAPS全国各站点资料，应用等熵位涡原理，对2009年1月下旬发生的寒潮天气过程进行分析．分析结果表明：这次寒潮过程冷空气源地在中高纬新地岛附近．寒潮爆发后，其向南越过长江流域，低层风速加大常以冷涌的形式出现．整个寒潮爆发阶段，高空高位涡向南向东从高层到底层不断侵入到中国，并在垂直方向上出现了对流层顶折叠的现象．此过程中伴随着正涡度增强，对应的低涡系统也越强，当到达我国北方地区时，东亚大槽加深，槽后冷空气随着高空引导气流迅速南下影响我国．
Using the NCAR/NCEP daily reanalysis data and MICAPS national station data, and applying the priciple of isentropic potential vorticity （IPV） analysis, a countrywide cold wave in the last ten - day period of Jan, 2009 is performed. It is found that the cold air of the cold wave originated about from Novaya Zemlya of middle and high latitude. After the outbreak of the cold wave, it propagated towards south over Changjiang River valley, with accelerating low - level wind speed to perform the form of cold surge. The whole outbreak phase of cold wave, high altitude,high PV continually intruded in China towards south and east from high down to bottom, with the performance of tropopause folding vertically. With the enhancement of positive vorticity, the corresponding low vortex system was strengthened. When arrived in North China,it made the East Asian Trough deepene. The cold air after the trough southward progarat with high altitude guide flow to affect China weather.
出处
《山东师范大学学报（自然科学版）》
CAS
2010年第1期121-125,共5页
Journal of Shandong Normal University(Natural Science)
关键词
寒潮
等熵位涡
冷空气源地
冷涌
正涡度
cold wave
the priciple of isentropic potential vorticity （IPV）
source region of cold air
cold surge
positive vorticity
