西风急流对鲁西北一次暴雨过程的影响  

Impact of Westerly Jet on Rainstorm Occurred in Northwestern Shandong Province

作　　者：贾文韬 孙即霖[1] 高山红[1] JIA Wentao;SUN Jilin;and GAO Shanhong(Physical Oceanograph Laboratory ~Ocean-Atmosphere interaction and climate laboratory, Ocean University of China,Qingdao 266100,China;92886troops of the PLA,Qingdao 266300,China)

机构地区：[1]中国海洋大学物理海洋实验室和海洋-大气相互作用与气候实验室 [2]中国人民解放军92886部队

出　　处：《海洋湖沼通报》2018年第4期13-20,共8页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金(41276012);国家自然科学重点基金(41430963)资助

摘　　要：利用WRF中尺度数值模式和FNL再分析资料,结合常规观测资料,对2015年08月03日发生在鲁西北地区的暴雨过程其进行了诊断计算、数值模拟和机制分析。研究表明,急流对上游强降水释放潜热向下游的输送和沿急流南侧传播的重力波共同影响是此次暴雨形成的重要因素:(1)上游地区降水过程的潜热释放通过西风急流输送到下游,使滨州地区对流层上层暖平流显著增强,引起强烈的上升运动;(2)高空急流南侧激发的中尺度重力波沿西风急流自西向东传播,波峰促使不稳定能量释放而触发强对流天气。A diagnostic calculation,numerical simulation and mechanism analysis were made for the heavy rain occurred in northwestern Shandong Province on BST 3 August 2015,which were based on the WRF meso-scale numerical model and FNL data.The study showed that the potential heat transferred by westerly jet stream and the mesoscale gravity wave along south jet stream both affected the rainstorm.The potential heat in upstream can be transferred to downstream by westerly jet and cause non-adiabatic heating in Binzhou,which can lead to warm advection and anticyclonic vorticity increase.Mesoscale gravity wave may occur in south of westerly jet stream and spread along the jet,and its wave crest may promote the release of unstable energy and raise a strong convective weather.

关 键 词：暴雨 高空急流 WRF 中尺度重力波 潜热 

分 类 号：P458.3[天文地球—大气科学及气象学]