“浣熊”强度变化的环境背景和卫星观测分析

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).

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

The role played by environmental background and inner core in the changes of intensity o f Typhoon Neoguri is documented by using observed track data, NCEP Final Analysi s, NOAA OI SST weekly means and FY satellite water vapor images. The results sho w that (1) the storm weakening is closely related to the vertical wind shears a nd 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).