Features of Ocean Surface Winds Observed by the QuikSCAT Satellite Before Tropical Cyclogenesis over the South China Sea
Ocean surface winds observed by the Quick Scatterometer (QuikSCAT) satellite prior to the geneses of 36 tropical cy- clones (TCs) in the South China Sea (SCS) are investigated in this paper. The results show that there are areas with negative mean horizontal divergence around the TC genesis locations three days prior to TC formation. The divergence term [-(f+ζ)( u/ x+ v/ y)] in the vorticity equation is calculated based upon the QuikSCAT ocean surface wind data. The calculated mean divergence term is about 10.3 times the mean relative vorticity increase rate around the TC genesis position one day prior to TC genesis, which shows the important contributions of the divergence term to the vorticity increase prior to TC formation. It is suggested that criteria related with the divergence and divergence term be applied in early detections of tropical cyclogenesis using the QuikSCAT satellite data.
作 者： WANG Lei LAU Kai-Hon FUNG Chi-Hung ZHANG Qinghong 作者单位： WANG Lei,FUNG Chi-Hung(Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong, P. R. China)LAU Kai-Hon(Institute for the Environment, Hong Kong University of Science and Technology, Hong Kong, P. R. China)
ZHANG Qinghong(Department of Atmospheric Sciences, Peking University, Beifing 100871, P. R. China)
刊 名： 中国海洋大学学报（英文版） ISTIC 英文刊名： JOURNAL OF OCEAN UNIVERSITY OF CHINA 年，卷(期)： 2008 7(3) 分类号： P7 关键词： tropical cyclone QuikSCAT South China Sea cyclone genesis