The statistical characteristics of the spatio-temporal distribution for global tropical storms

Statistical analysis to the global tropical storms shows that there are some significant statistical characteristics in the their spatio-temporal distribution.In every oceanic area,the storm-occurring frequency is of seasonal concentration,with the peaks of frequency of the tropical storms corresponding to the peaks of SST.In the Pacific Ocean and the Indian Ocean,the areas of the storm-dense months go geographically counte-rclockwisea year.The total occurrence frequency of the global tropical storms is the highest in August and September,and the lowest in April and May.The occurring density and extending extent of storms are larger in the northern hemisphere than in the southern one.The largest density is located in the North-East and-West Pacific Ocean.The storm-occurring frequency in each oceanic area is of interannual and decadal oscillation,existing distinctly the repeating-change of two to three years,six to seven years,eleven to twelve years and twenty-one to twenty-two years.It is quite often that the strong er the storms,the longer the life-spans of the storms.Among months,the stronger and longe-rlasting storms occur more often in the months with higher storm frequency than in the months with lower storm frequency,yet, among years,the stronger and longer-lasting storms usually occur in they ears with less storms.In the large-scale background,the storm moves along the anticyclonic path.