CAJ | 학술논문

利用常规观测资料、美国环境预报中心逐6 hFNL（1°×1°）再分析格点资料、NCEP／NCAR（2．5°×2．5°）逐6 h再分析资料、FY－2E气象卫星资料和雷达回波资料，用天气学分析和物理量场诊断分析方法，探究了2012年6月4～5日发生在新疆库尔勒至甘肃玉门一带干旱地区60 a一遇的大暴雨天气过程的水汽来源以及触发机制。结果表明：中层强盛西南低空急流和低层偏东低空急流为暴雨区源源不断地输送水汽并带来不稳定能量；前倾槽结构和低层增温增湿，形成大气层结强烈对流不稳定；低层切变线（850 hPa）和其上空辐合线（700 hPa）叠加，导致不稳定能量释放，诱发大暴雨天气过程发生；低空辐合高空辐散，形成整层上升运动，为大暴雨的发展和维持提供了动力条件。
이용상규관측자료、미국배경예보중심축6 hFNL（1°×1°）재분석격점자료、NCEP／NCAR（2．5°×2．5°）축6 h재분석자료、FY－2E기상위성자료화뢰체회파자료，용천기학분석화물리량장진단분석방법，탐구료2012년6월4～5일발생재신강고이륵지감숙옥문일대간한지구60 a일우적대폭우천기과정적수기래원이급촉발궤제。결과표명：중층강성서남저공급류화저층편동저공급류위폭우구원원불단지수송수기병대래불은정능량；전경조결구화저층증온증습，형성대기층결강렬대류불은정；저층절변선（850 hPa）화기상공복합선（700 hPa）첩가，도치불은정능량석방，유발대폭우천기과정발생；저공복합고공복산，형성정층상승운동，위대폭우적발전화유지제공료동력조건。
Based on the conventional observations,NCEP / NCAR reanalysis data,FY-2E satellite images and radar data,the synop-tic analysis and physical field diagnostic analysis methods were used to explore the triggering mechanisms and vapor sources of the heav-y rainstorm that occurred in Northwest China. By analyzing circulation patterns,vapor,dynamic and unstable conditions,the results show that the southwestern low level jet and the eastern low level jet played significant roles during the heavy rainfall process,they brought abundant water vapor and unstable capability. Forward trough and warming humidification in the low layer made stratification convective instability. The overlay of convergence line on 700 hPa and the shear line on 850 hPa was the triggering condition,which re-sulted in the release of unstable capability and induced the heavy rainstorm. Meanwhile,convergence at low level and divergence at up-per-level formed upward motion over the entire layer,which was the dynamic condition. The study not only provides focus for forecas-ting heavy rainstorms in arid Northwest China,but also supplies references to control flood and mitigate disasters for local government.