Statistic and typical-year composition methods are used to study the northwest Pacific typhoon activities in relation with the El Nino and La Nifia events. The result indicates that the typhoon tends to be inactive in...Statistic and typical-year composition methods are used to study the northwest Pacific typhoon activities in relation with the El Nino and La Nifia events. The result indicates that the typhoon tends to be inactive in the El Nifio years and active in the La Nina years and it is also dependent on the onset and ending time and intensity of the events and areas of genesis of typhoons. With statistic features of the frequency of typhoon activity in the El Nifio and La Nina years and the time-lag correlation between the frequency and sea surface temperature (SST). useful information is provided for the prediction of typhoon occurrence. In addition, the singular values disassemble (SVD) method is applied to study the correlation between the geopotential field and SST field. The result shows that the air-sea coupling in the El Nino years is unfavorable for the typhoon to develop, which take place with a smaller number. Opposite situations are found with the La Nina years.展开更多
文摘Statistic and typical-year composition methods are used to study the northwest Pacific typhoon activities in relation with the El Nino and La Nifia events. The result indicates that the typhoon tends to be inactive in the El Nifio years and active in the La Nina years and it is also dependent on the onset and ending time and intensity of the events and areas of genesis of typhoons. With statistic features of the frequency of typhoon activity in the El Nifio and La Nina years and the time-lag correlation between the frequency and sea surface temperature (SST). useful information is provided for the prediction of typhoon occurrence. In addition, the singular values disassemble (SVD) method is applied to study the correlation between the geopotential field and SST field. The result shows that the air-sea coupling in the El Nino years is unfavorable for the typhoon to develop, which take place with a smaller number. Opposite situations are found with the La Nina years.
