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一、引言目前,国际航空和气象界均已公认低空风切变(通常指近地面600米高度以下的风切变)是飞机起飞和进近着陆阶段的一个危险因素,它严重危害航空活动的安全。由于低空风切变现象具有时间短、尺度小、强度大的特点,随之带来了探测难、预报难等一系列困难,是一个不易解决的航空气象难题。对于乌鲁木齐机场来讲,人们最关心而且最难掌握的是东南大风引起的低空风切变。乌鲁木齐机场东南大风多发生于春秋两季,冬季则主要出现在窄中,因近地层逆温的阻挡而不能下传。东南大风风向度一般为130°～170°。,尤以140°～150°。为多,风
I. INTRODUCTION Currently, the international aviation and meteorological community has recognized that low-level windshear (usually referred to as windshear below 600 meters above the ground) is a risk factor for aircraft take-off and approach and landing, which seriously endangers aviation activities Safety. Due to the short time, small scale and high intensity, the phenomenon of low-level wind shear is accompanied by a series of difficulties such as difficult exploration and difficult prediction. It is an unsolved aeronautical and meteorological problem. For Urumqi Airport, people are most concerned about and the most difficult to grasp is the southerly winds caused by low-level wind shear. Southeastern winds in Urumqi Airport occurred mostly in spring and autumn, winter mainly in the narrow, because of the inversion of near-surface temperature and can not be downloaded. Southeaster wind direction generally 130 ° ~ 170 °. , Especially 140 ° ~ 150 °. As much wind