新疆百里风区强风中尺度特征分析

大尺度环流背景和天山山脉大地形共同作用形成新疆百里风区，其风力之大居全疆九大风区之首。为进一步研究百里风区强风中尺度特征及其与局地地形的关系，选取2018年5月6—8日百里风区强风天气过程，使用WRF模式进行中尺度模拟分析，形成以下结论：天山两侧气压梯度力驱动下冷空气翻越天山，经色皮山口狭管效应和过山波水跃下沉接力加速，在背风坡上空形成强风区，强风区接地形成百里风区地面大风；大风过程中，七角井盆地地形强迫引发有限振幅重力波，背风坡上空大风区之上的临界层吸收上层能量并向下传递，增大了大风区的风速，使得低空大风区的接地更加充分。低空大气稳定层结的强度与大风强度相对应。

Mesoscale Characteristics of Strong Wind in Xinjiang 100-kilometer gale Area

The large-scale atmospheric circulation situation and the topography of the Tianshan Mountains form the 100-kilometer gale area in Xinjiang together, whose wind strength ranks first among the nine-gale-area in Xinjiang.In order to further study the mesoscale characteristics of strong wind in the 100-kilometer gale area and its relationship with the local terrain, a extreme gale event in the 100-kilometer gale area during May 6-8th, 2018 was selected to conduct mesoscale simulate and analysis using WRF model, result show:Under the pressure gradient between north-south sides of Tianshan mountains, the cold air goes over the Tianshan and accelerates by the narrow tube effect of the pass and the hydraulic jump of over mountain wave. The strong wind zone is formed over the leeward slope, and the strong wind area touching the ground and form the ground wind in the 100-kilometers gale area.During the process, the topographic forcing in Qijiaojing Basin causes the finite amplitude gravity wave, and the critical layer above the gale area above the leeward slope absorbs the upper energy and transfers it downward, which increases the wind speed in the gale area. The stable stratification of the low atmosphere intensifies the downward transmission of the wave energy, which makes the low-level gale zone more close to the ground.