“浣熊”强度变化的环境背景和卫星观测分析

Analysis of Environment Background and Satellite Observations About Intensity Changes of Typhoon Neoguri

利用实况观测定位和强度资料、NCEP的1°×1°全球最终分析资料、NOAA周平均1°×1°海温再分析资料和FY卫星水汽图像,分析台风浣熊(0801)的环境背景条件和内核结构演变与强度变化的关系。结果表明:(1)环境风垂直切变增大至10m.s-1左右与南海北部海表温度逐步减小导致最大可能强度不断降低是"浣熊"快速发展过程中断并减弱的重要外部条件;(2)卫星水汽图像显示内核结构存在眼壁破裂和复原现象,该现象精确地反映其强度变化。眼壁破裂(复原)过程导致"浣熊"减弱(增强)。

The role played by environmental background and inner core in the changes of intensity of Typhoon Neoguri is documented by using observed track data,NCEP Final Analysis,NOAA OI SST weekly means and FY satellite water vapor images.The results show that（1） the storm weakening is closely related to the vertical wind shears and sea surface temperature.The vertical wind shears increase in magnitude to about 10m/s,and the Maximum Potential Intensity（MPI） decreases when the system moves over a cool tongue of water,the intensification comes to an end;（2） The breakdown and recovery of eyewall revealed by vapor images,are consistent with intensity changes.The breakdown（recovery） of eyewall leads to the storm weakening（deepening）.