摘要
利用2002—2011年JTWC最佳路径资料和NCEP的1°×1°全球最终分析资料以及热带气旋年鉴,分析了西北太平洋不同路径下热带气旋(TC)快速加强(RI)的时空分布特征,并对不同路径下快速加强(RITC)和缓慢加强(Non-RITC)两组TC进行合成分析和对比分析。结果表明:转向路径发生RI频率最大,且转向路径中西转向的TC最易发生RI过程;其次是东北和西北行路径。在时间分布上,各个路径下RI的月际和日变化具有不同的位相分布特征;在空间分布上,大多数RI过程发生在菲律宾和台湾岛以东洋面,西行路径在南海北部也出现较多RI过程,转向路径RI过程多发生在转向处。各个路径下RITC与Non-RITC环境场存在较明显差异,RITC对流层上层的南亚高压相对较弱,中低层副高相对较强,对流层低层存在较大的相对湿度,且湿度大值区域位于TC移动方向前侧。不同路径下的快速加强的环境影响因素也有所不同。
The best track datasets of JTWC and typhoons yearbooks for the past decades （2002- 2011 ） in Northwestern Pacific are used to study the statistical characteristics of the rapid intensification （RI） of tropical cyclones（TCs） with different tracks. The different effects of the environmental factors between the RITCs and slow deepening tropical cyclones（Non-RITCs） are analyzed by using the dynamic composite analysis technique with the NCEP FNL data. It is showed that the probability of RI reaches the maximum when the TC track is turning（ especially turning with the angle between 120° - 125° ）. Then the northeastward and northwestward tracks follow in second and third position. There are differences of value and phase distribution in monthly and daily variations of RI among different tracks. And the east of Phil- ippines and Taiwan Island is the region where TC rapid intensification is most likely to occur. If TC moves westward, some RI processes can also appear in the northern South China Sea. The statistics also indicate that once a TC takes a turning track, it often intensifies rapidly at its turning point. The environment fields of RITC and Non-RITC are dramatically different. The RITCs show the larger lower-level relative humidity in front of the moving direction. In contrast with Non-RITC, the South Asia high, which influ- ences the RITC, is much weaker. The strength of subtropical high is strong. Differences of environmental effects are found among the RITCs with different tracks.
出处
《气象科学》
北大核心
2016年第2期194-202,共9页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(41275002和41175054)
灾害天气国家重点实验室开放课题(2014LASW-B08)
江苏省高校自然科学研究重大项目(14KJA170005)
江苏省"333高层次人才培养工程"
关键词
热带气旋
突然加强
缓慢加强
统计特征
合成分析
Tropical cyclone
Rapid intensification
Slow deepening
Statistical characteristics
composite analysis
作者简介
通信作者（Corresponding author）：钟玮（ZHONG Wei）．wzhong—vivian@126．com
