罗莎(0716)台风外围螺旋雨带中尺度结构的双多普勒雷达试验研究  

Structure of Typhoon Krosa(0716) Outer Rainband Observed by Dual-Doppler Radars

作　　者：周海光[1] 

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室,北京100081

出　　处：《气象》2010年第3期54-61,共8页Meteorological Monthly

基　　金：国家自然科学基金项目(40605014);科技部国家高技术研究发展计划项目(2007AA061901);科技部国家重点基础研究发展规划项目(2004CB418305);中国气象科学研究院灾害天气国家重点实验室基本科研项目(2008LASWZI01);上海台风研究所台风基金(200603)资助

摘　　要：强台风罗莎(Krosa)于2007年10月7日15:30在福建省福鼎和浙江省苍南交界处第三次登陆,登陆期间,"罗莎"外围螺旋雨带恰好穿越宁波和舟山双多普勒雷达同步观测区。利用双多普勒雷达三维风场反演技术对双雷达时间同步探测资料进行风场反演,研究了螺旋雨带的三维风场结构。在螺旋雨带内部低层有多个强回波区。3 km高度以下,在雨带上游,雨带外侧水平速度与雨带夹角较小,内流较弱;雨带下游,水平速度与雨带夹角逐渐增大,内流较强;在雨带内侧有明显的外流。垂直剖面内,雨带外侧低层有明显的内流,气流从雨带外侧2 km高度以下的低层进入雨带;而在雨带内侧存在明显的外流,两支气流在雨带内部低层辐合,在雨带内部形成强回波区;外围螺旋雨带切向速度分量随高度增加而逐渐减小,最大速度区在2 km高度。The typhoon No.0716（Krosa） landed on the vicinity region between Zhejiang Province and Fujian Province at 1530 BT 7 October 2007 for the third time.An outer spiral rainband passed through the dual-Doppler radar observation domain that was composed of Ningbo and Zhoushan Doppler radars.Three dimensional wind field was retrieved by the dual-Doppler radar data.The mesoscale structure of the spiral rainband was investigated by the 3D wind.It shows that there were some strong reflectivity areas in the low level of the rainband region.The inflow in the upstream of the rainband outside was weak.On the other hand,the inflow in the downstream of the rainband outside was strong.There was outflow in the inside of the rainband at the low level.In the vertical cross-section,there was inflow in the low level of the outside rainband.The inflow entered the rainband at low level（z2 km） from the outside rainband.On the contrary,there was outflow in the inner side of the rainband.These flows converged at the low level of the rainband central region.The tangential component of the wind decreased with height and the maximum wind region was at 2 km level.

关 键 词：台风 螺旋雨带 双多普勒雷达 风场反演 三维结构 

分 类 号：P[天文地球]