On abnormal features and formation causes of tropical cyclones landing southeastern coastal zones of China
登陆东南沿海热带气旋的异常特征及其成因研究

With the Tropical Cyclone(Typhoon) Year-Books data from 1949 to 2005,the features of the TC activities in the western Pacific as well as TCs landing in the coastal area of southeastern China are analyzed.It is found that the number of TCs in the western Pacific and landing in China has decreased slightly, while the intensity of the TCs landing in China has increased significantly.In 2005,there are fewer TCs in the western Pacific,which results from the adverse factors for TC's generating,such as higher south Asia high in prior time,stronger subtropical high,weaker East Asian summer monsoon,and vertical shear of zonal wind in TC period.At the same time,the proportion of strong TCs landing in China is larger than normal,which may be caused by many factors,like the abnormal moisture transportation in west part of the western Pacific,weak wind vertical shear, SST anomaly and the interaction of weather systems between mid-and low-latitude areas.