东海转向和登陆热带气旋特征合成分析  

Composite Analysis on Characteristic of Tropical Cyclone Recurvature and Landfall over East China Sea

作　　者：钱燕珍 许映龙[2,3,4] 徐迪峰 

机构地区：[1]宁波市气象台,宁波315012 [2]中国气象科学研究院,北京100081 [3]南京信息工程大学,南京210044 [4]国家气象中心,北京100081

出　　处：《气象》2013年第12期1600-1608,共9页Meteorological Monthly

基　　金：国家重点基础研究发展计划项目(2009CB421504);国家自然科学基金项目(41275063);中国气象局气象关键技术集成与应用项目(CMAGJ2013M21);上海台风基金项目(2009ST08);浙江省气象局项目(2012YB10)共同资助

摘　　要：进入东海的热带气旋(TC)每年有3.2个,转向或者髓陆将造成不同的影响。通过对这两类TC登陆或转向前后,形势场和物理量场的合成分析得到:转向类TC,副热带高压(以上简称副高)弱,东侧呈块状;西风带强,离TC近;中高层西风急流明显急流在向东移动过程中有增强趋势;TC东北方高层辐散增强,在中低层有正涡度平流,涡度平流中心清晰。而登陆尖TC,副高强,呈宽带状;西风带弱,离TC远;西风急流不明显,没有增强,高层急流中心位于TC的西北方和北方;TC东北方高层没有明显的辐散流出,中低层正涡度平流位于TC的西北方和北侧,涡度乎流中心不清晰。转向或登陆前72 h各特点已有显示,前48 h其特征更加明显。There are 3.2 tropical cyclones （TCs） entering into the East China Sea on average every year. Recurvature or landfall of these TCs will make different effects. The comparative analysis on the situations and physical fields of recurving TCs and landfalling TCs shows that in the case of recurving TCs, subtropi- cal high is weak and the east part of it is in massive shape; westerly belt is strong and close to TC; the middle- and upper-level westerly jets are significant and get intensified as they move eastward; the upperlevel divergence at the northeast of TC enhances while notable positive vorticity advection is found in the middle- and low-levels of TC with clear advection center. However, in the case of landfalling TCs, sub- tropical high is strong and in broad belt shape; westerly belt is weak and distant from TC; westerly jet is not notable and is not intensified; the upper-level jet center is located in the northwest and north of TC; no remarkable upper-level divergence occurs in the northeast of TC and the middle- and low-level positive vorticity advection is located in the northwest and north of TC with no notable advection center. The characteristics above can be seen 72 hours before the recurvature or landfall of TCs, and get much clearer in 48 hours before the events.

关 键 词：热带气旋 转向 登陆 合成分析 东海 

分 类 号：P458[天文地球—大气科学及气象学]