基于激光测风雷达的低空急流结构特征研究

低空急流对航空安全保障以及灾害性天气预警预报等具有重要意义。为了研究低空急流的结构特征，基于激光测风雷达收集的数据，对西宁机场2017-11-30~2017-12-01的气象资料进行了分析。结果表明, 低空急流风速随高度先增大后减小，强度和厚度随时间减弱，急流轴高度随时间升高，在急流中心出现了强的冷暖平流，并随急流减弱而减弱，急流顶风向随高度顺转，湍流较强，01:30时急流结构受到破坏，湍流强度达到最大; 21:00以后低空急流中出现湍流团，风速波动较明显，湍流团尺度先增大后减小。这一结果说明高激光测风雷达对低空急流的结构特征以及低空急流内部强度和脉动有很好的探测效果。

Structural characteristics of low-level jet based on wind lidar

Low-level jet is of great significance to aviation security and severe weather warning and forecast. In ordar to study the structual features of low-level jet, the wind lidar data from xining airport from 2017-11-30 to 2017-12-01 were analyzed in detail. Results show that the low-level jet velocity decreased after the first increased with height, the strength and thickness decreased with time, and the jet axis height increased with time. There appeared a cold advection in the center of the jet, and its intensity drops with the jetdecreases. The rushing wind turn along with height at the top of the jet, and the turbulence is strong. The jet structure was damaged at 01:30, and the turbulent intensity reached the maximum. After 21:00, the turbulence cluster appeared in the low-level jet, and the wind speed fluctuation was obvious. The turbulence cluster scale first increased and then decreased. The results showed that the wind lidar has a very good detection effect on the structural characteristics of low-level jet as well as the internal intensity and pulsation of low-level jet.