1961—2023年新疆区域冷空气过程强度特征  

Intensity of Regional Cold Air Processes in Xinjiang during 1961-2023

作　　者：佟欣怡 刘艳 张婧莉 吴秀兰[1] 刘精 张同文 TONG Xinyi;LIU Yan;ZHANG Jingli;WU Xiulan;LIU Jing;ZHANG Tongwen(Xinjiang Climate Center,Urumqi 830002,China)

机构地区：[1]新疆维吾尔自治区气候中心,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2024年第5期106-112,共7页Desert and Oasis Meteorology

基　　金：新疆气象局科技创新基金项目(MS202408)。

摘　　要：利用1961—2023年新疆105站日平均气温和日最低气温,24、48、72 h日最低气温降温幅度以及NCEP/NCAR再分析日资料,分析新疆区域不同强度冷空气过程的变化特征,探究影响新疆区域冷空气过程的关键环流因子。结果表明:1961—2023年新疆区域冷空气过程共计发生746次,其中中等强度冷空气过程149次,强冷空气过程136次,寒潮过程461次。新疆区域冷空气过程整体呈减少趋势,21世纪后新疆区域寒潮过程在冷空气过程中所占比率逐渐增加,但寒潮过程年平均强度波动不显著。新疆区域发生强寒潮过程的关键因子是乌拉尔山阻塞高压和欧亚冷高压,乌拉尔山阻塞高压和欧亚冷高压强盛时,有利于高纬度冷空气南下,新疆区域易暴发寒潮。Utilizing datasets encompassing daily average temperature,minimum temperature,and minimum temperature drop range over 24-hour,48-hour,and 72-hour periods,along with NCEP/NCAR reanalysis data from 105 stations in Xinjiang from 1961 to 2023,this study delves into the variation characteristics of cold air processes of varying intensities in the region.Additionally,it investigates the primary circulation factors influencing the intensity of cold air processes in Xinjiang.Analysis reveals the occurrence of a total of 746 regional cold air processes in Xinjiang over the aforementioned period,comprising 149 moderate intensity events,136 strong occurrences,and 461 instances of cold waves.While an overall decreasing trend is observed in cold air processes in Xinjiang,the proportion of cold wave processes within these events has gradually increased since the 21st century.Nonetheless,the annual average intensity fluctuation of cold wave processes in the region remains insignificant.Key factors contributing to the occurrence of strong cold waves include the presence of high-pressure systems over the Ural Mountains and the Eurasian cold high-pressure system.Notably,changes in the Ural blocking high and Eurasian cold high exhibit a positive correlation with cold air processes in Xinjiang.

关 键 词：区域冷空气 强度指数 强度等级 新疆 

分 类 号：P466[天文地球—大气科学及气象学]