摘要
应用Topex/Poseidon卫星高度计海面高度距平(SSHA)资料以及TMI的逐日海表温度数据,对两个局地生成的热带气旋(1999年台风LEO和2000年台风WUKONG)引起的南海北部海洋响应过程进行研究。结果表明,在热带气旋影响下,海面高度显著降低,SSHA平均减少30cm,流场上出现气旋型环流,海表温度显著降低,降低幅度为2℃左右,在其尾迹上出现冷涡;相对于降温过程,海表温度的恢复过程非常缓慢;热带气旋强度突变或移行较缓时易引起海洋的强烈响应,这种响应的空间和时间尺度都较大,持续时间至少1周,发生响应的海域范围也很广,甚至可以跨越3个纬度的距离。
Responses of upper layer of the northern South China Sea to two locally-generated tropical cyclones have been studied by using the data derived from Topex/Poseidon altimeter and SST data from TRMM Microwave Imager （TMI）. The two tropical cyclones are typhoon LEO from April 27th to May 2nd in 1999 and typhoon WUKONG from September 5th to September 10th in 2000. The following results are obtained. The sea surface height decreased and a geostrophic current appeared under the influence of the tropical cyclones. SST decreased apparently and there were cold eddies in the wakes of the tropical cyclones. Compared with the process of SST decreasing, it took longer time, about one week, for SST to recover. The sea surface height tended to show an intense response when there were abrupt changes in the intensity of the tropical cyclones or when they moved slowly. These responses appeared to have large spacial and temporal scales.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2008年第4期10-18,共9页
Journal of Tropical Oceanography
基金
国家自然科学基金资助项目(40576015,40576015)
中国海洋大学物理海洋学教育部重点实验室开放课题(200304)
关键词
南海北部
局地生成热带气旋
卫星高度计资料
响应
northern South China Sea
locally-generated tropical cyclone
altimeter data
response
