摘要
利用常规观测资料、气象卫星资料和NCEP 1°×1°再分析资料,对0806号台风"风神"登陆后的暴雨强度和落区进行诊断分析。结果表明:台风暴雨主要发生在台风登陆后48 h内,水汽通量散度、垂直速度、绝对涡度的空间分布与强降雨落区有很好的对应关系;冷空气入侵低压环流西部触发不稳定能量释放,对降水起到了增幅作用;从湿焓及湿焓平流场上可以提前12 h做出能量累积和未来强降水落区的预报,高湿焓区是不稳定能量聚集区,而台风压能风对湿焓的平流较为准确地反应了24 h后的强降水落区。
By using the data observed by conventional means, meteorological satellites and NCEP 1 °× 1°reanalysis, a diagnostic study was carried out of the intensity and falling area of Tropical Cyclone Fengshen（0806） rainfall. Results are as follows. （1） Typhoon rainfall mainly happens in the 48 hours after landfall. The water flux divergence, vertical velocity, and spatial distribution of absolute vorticity are well related with the heavy rainfall area. （2） Cold air intruding into the west part of the typhoon trough results in the release of unstable energy, which reinforces the precipitation. （3） In accordance to moist enthalpy and its distribution, a 12-h forecast is made of the energy accumulation and strong rainfall areas by making use of the fact that high moist enthalpy is an area where unstable energy accumulates and advection of moist enthalpy by the storm＇s pressure energy wind reflects rather correctly the falling area of rainfall appearing 24 hours later.
出处
《热带气象学报》
CSCD
北大核心
2010年第2期250-256,共7页
Journal of Tropical Meteorology
基金
佛山市科技发展专项资金资助项目(200609001)资助
关键词
天气学
台风暴雨
落区
湿焓
湿焓平流
诊断分析
synoptic meteorology
typhoon rainfall
rainfall area
moist enthalpy
pressure energy trough to moist enthalpy
diagnostic analysis
