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利用常规观测资料、多普勒天气雷达观测资料、风廓线雷达资料及NCEP/NCAR再分析资料,对2013年4月30日发生在广州白云机场终端区的飑线过程进行了诊断分析和数值模拟。结果表明:此次过程是由高空槽东移带动地面弱冷空气南下造成的;高分辨率WRF(Weather Research and Forecasting)模式较好地模拟出了这次飑线的形态和发展变化过程;飑线内部有较明显的倾斜气流,发展阶段内部以上升气流为主,成熟阶段强的上升运动主要位于600 h Pa以上,中低层则由于拖曳作用有显著的下沉气流;此次飑线过程有明显的地面冷池和雷暴高压配合,飑线的强度变化与地面冷池的变化存在明显相关,发展阶段雷暴高压出现在整个飑线的下方及后部,在成熟阶段其下方的正变压与后部的负变压呈对称结构。
Using routine observation data, Doppler weather radar observation data, wind profiler radar data and NCEP / NCAR reanalysis data, the diagnostic analysis and numerical analysis of the blunt process occurred on the terminal area of Guangzhou Baiyun Airport on April 30, 2013 simulation. The results show that this process is caused by moving the weak cold air southward from the eastward movement of the upper trough. The WRF (Weather Research and Forecasting) model simulates the shape and evolution of the taphole effectively. The more inclined airflow in the interior of the line, the ascending air flow is dominant in the development stage, the strong ascending movement in the mature stage is mainly located above 600 hPa, while the middle and lower floors have significant sinking airflow due to the dragging action. Obvious ground cold pool and thunderstorms under high pressure, the strength of the line changes with the cold pool changes in the ground there is a clear correlation, the development stage of the thunderstorm high pressure appears in the bottom of the line and the back of the mature stage below its positive pressure and The rear of the negative pressure was symmetrical structure.