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利用NCEP再分析资料对2013年5月17日14时兰州飞行情报区两架航空器发生严重颠簸的个例进行诊断分析,结果表明:颠簸区位于切断低压底部高空西风急流出口区南侧,急流轴最大风速超过55m/s;急流轴南侧产生的下沉气流是造成严重颠簸的主要原因。
Based on the NCEP reanalysis data, a case study of two serious aircraft bumps in the Lanzhou FIR at 14 o’clock on May 17, 2013 was conducted. The results show that the bumpy area is located on the south side of the export high-westerly jet outlet at the bottom of the low-pressure region, The maximum wind speed is more than 55m / s; the descending airflow generated on the south of the jet stream shaft is the main cause of serious jolt.