一次大范围海效应暴雪的雷达反演风场分析  

Analysis on radar wind field retrieval of a snowstorm derived from ocean-effect

作　　者：王琪[1] 杨成芳[2] 王俊[3] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100 [2]山东省气象台,济南250031 [3]山东省人民政府人工影响天气办公室,济南250031

出　　处：《气象科学》2015年第5期653-661,共9页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41175044)

摘　　要：用EVAP(Extended Velocity Azimuth Processing)方法对2010年12月30日发生在山东半岛的一次海效应暴雪过程进行风场反演,以了解暴雪过程中雷达回波和低层风场的特征。得出以下结论:(1)烟台和威海暴雪发生时间不同步,降雪带有明显东移的过程,对应烟台强回波带逐渐向东移动,而威海回波位置少动。(2)雷达回波开始产生于渤海,减弱也始于渤海;强回波带的位置与风场的辐合区有很好的对应关系。(3)反演风场水平切变线的移动,会引起强回波带的波动;烟台北部切变线相对稳定,南部切变线西移,致使强回波带沿顺时针方向旋转;威海南部切变线位置相对稳定,北部切变线西移,引起强回波带沿逆时针方向旋转。(4)辐合切变线是由经过辽宁南下的东北风与山东半岛的西北风(西风)辐合构成;切变线受西风分量减弱的影响而发生移动。The EVAP technology was used to retrieve an ocean-effect snowstorm in Shangdong Pen-insula on 30 December, 2010, in order to analyze the characteristics of radar echo and wind field at lowlevel during snowstorm.Results show that the snowstorm did not take place simultaneously in Yantai andWeihai and the snowbelt moved eastward obviously, meanwhile, the corresponding strong echo zone grad-ually moved to east in Yantai, but kept stationary in Weihai. The strong radar echo started and weakenedin the Bohai Sea, and the location of the strong echo zone corresponded well to the convergence zone ofwind field. The movement of horizontal shear line of retrieval wind field led to the fluctation of strong echozone. The shear line in northern Yantai was relatively stable, but in southern Yantai it gradually moved towest, which caused the strong echo zone to rotate clockwise; the shear line in southern Weihai was rela-tively stable, but in northern Weihai it gradually moved to west, which caused the strong echo zone to ro-tate counterclockwise. The convergence of northeast wind crossing Liaoning province and the northwest（west）wind in Shangdong Peninsula brought about the shear line, whose movement was affected by theweakening west wind component.

关 键 词：暴雪 海湖效应 反演风场 EVAP 

分 类 号：P412.25[天文地球—大气科学及气象学]