塔里木盆地东北缘一次强对流天气过程中的阵风锋特征  

Characteristics of a Gust Front during a Severe Convective Weather Process in the Northeast Margin of the Tarim Basin

作　　者：袁琳 孙棋 阿不都外力·阿不力克木 买买提艾力·买买提依明[2,3] 安大维 贺小宁 YUAN Lin;SUN Qi;Abuduwaili Abulikemu;Ali Mamtimin;AN Dawei;HE Xiaoning(Xinjiang Key Laboratory of Oasis Ecology/College of Geography and Remote Sensing,Xinjiang University,Urumqi 830047,China;Institute of Desert Meteorology,China Meteorological Administration/Taklimakan Desert Meteorology National Field Observation and Research Station of Xinjiang/Taklimakan Desert Meteorology Field Scientific Test Base of China Meteorological Administration,Urumqi 830002,China;Xinjiang Key Laboratory of Desert Meteorology and Sandstorm,Urumqi 830002,China;Xinjiang Meteorological Observatory,Urumqi 830002,China)

机构地区：[1]新疆大学地理与遥感科学学院/新疆绿洲生态重点实验室,新疆乌鲁木齐830047 [2]中国气象局乌鲁木齐沙漠气象研究所/新疆塔克拉玛干沙漠气象国家野外科学观测研究站/中国气象局塔克拉玛干沙漠气象野外科学试验基地,新疆乌鲁木齐830002 [3]新疆沙漠气象与沙尘暴重点实验室,新疆乌鲁木齐830002 [4]新疆气象台,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2024年第3期47-55,共9页Desert and Oasis Meteorology

基　　金：国家重点研发计划项目(2018YFC1507103);国家自然科学基金资助项目(42265003);新疆维吾尔自治区自然科学基金面上项目(2022D01C359);科技创新团队(天山创新团队)项目(2022TSYCTD0007);第三次新疆科考项目子课题(2022xjkk030502)。

摘　　要：利用地面自动站逐小时观测、多普勒天气雷达及WRF模式高分辨率数值模拟,分析2016年7月塔里木盆地东北缘一次强对流天气过程中的阵风锋特征。结果表明:阵风锋前沿较强的辐合抬升运动不断触发多个对流单体,其中大部分单体与其后方的对流系统合并且进一步发展,使得强对流天气不断发展和维持。在对流系统快速发展阶段,阵风锋前沿水平风的垂直切变造成湿位涡的斜压分量显著增强,从而增强局地的条件对称不稳定,为对流系统的发展和维持提供了重要的不稳定能量。不稳定能量释放需要的锋生强迫作用主要是由阵风锋前方的辐合辐散项和倾斜项决定,而阵风锋前沿附近的水平形变项及其上方的非绝热加热项贡献相对较弱。The characteristics of a gust front during a severe convective weather process in the northeast margin of the Tarim Basin in July 2016 is investigated based on hourly ground-based automatic weather station data,radar observation data and Weather Research and Forecasting(WRF)model high-resolution simulation data.The results showed that the strong convergent lifting effect at the front of the gust front caused the continuous triggering of multiple convective cells at the front of the gust front,most of which merged with the convective system behind it and further developed,resulting in the continuous developed and maintenance of severe convective weather.The analysis of the Moist Potential Vorticity(MPV)characteristics showed that the vertical shear of the horizontal wind at the front of the gust front caused a significant increase in the baroclinic component of the MPV during the rapid development period of the convective system,which enhanced the local Conditional Symmetric Instability(CSI)and provided an important instability condition for the development and maintenance of the convective system.The frontogenetical forcing required for the release of the unstable energy was mainly determined by the convergence and slantwise terms ahead of the gust front,while the horizontal deformation term near the gust front and the diabatic heating term aloft provided relatively weak contributions.

关 键 词：阵风锋 对流触发 条件对称不稳定 锋生强迫 

分 类 号：P442[天文地球—大气科学及气象学]