【摘要】 利用2018年1月2-8日淮河流域一次典型暴雪过程的风廓线雷达资料,分析水平风速、风向、垂直动量、大气折射率结构常数等参数,对暴雪的高低空风场及环流微观结构进行研究.结果表明,风廓线雷达在暴雪发生前就能探测到2.7 km高度左右形成的东北-西南切变,以及低层偏东风增强的风场变化,当2 km高度内偏东风增大至约10 m/s时,暴雪发生;暴雪期间中低层风速减小、风向转换由顺时针逐渐变为逆时针,水平风垂直动量在风向切变区间内的强度较强、变化较大, 2 km内以上升运动为主;暴雪趋于结束时,雷达探测到低层转为偏西风,风速减小且伴随着中高层动量不断下传和加强.通过折射率结构常数和垂直风切变的分析,发现不同降雪阶段的湍流运动和能量分布存在差异.更多还原

【Abstract】 A blizzard process in Huaihe River Basin at 2-8 January 2018 was chosen and, based on the high space-time resolution of vertical data from horizontal wind fields, vertical momentum and turbulent movement, the upper and lower variation characteristics and microstructure were analyzed. The results showed that the wind profile radar could detect the information that indicated the northeast-southwest wind shear was at 2.7 km and the northeast wind of the lower layer further strengthened upwards before the blizzard. During the blizzard, the vertical momentum was mainly of an upward movement in 3 km height; after the momentum went down and strengthened from the upper troposphere. Through an analysis of structure constants of the refractive index and vertical wind shear, difference was found at the turbulent movement and energy distribution during the blizzard.更多还原