Title: FURTHER STUDY ON THE CHARACTERISTICS OF FREQUENCY VARIATION OF TROPICAL CYCLONES ACTIVITY OVER WESTERN NORTH PACIFIC AND THE RELATIONSHIP WITH SEA SURFACE TEMPERATURE
Abstract: Using the data of Tropical Cyclones (TCs) series for the 56-yr period of 1949—2004, we studied the statistical characteristics of the multi-year variation of the frequency of TCs activity over the western North Pacific and the relationship with sea surface temperature (SST). The results show that the frequency of TCs activity over the area has interannual and interdecadal variability, which differs with the intensity of TCs but tends to decrease with time and TCs do not increase significantly due to global warming. Three areas are identified in this study to discuss the influence of SST. The results show that the increase of TCs frequency is caused by negative SST anomaly in the equatorial eastern Pacific. The positive anomaly of TCs frequency will result in negative SST anomaly in the western North Pacific based on an existing lead-lag correlation. The more severe the TCs, the earlier they are influenced by SST and large frequency of TCs will in turn result in negative SST anomaly in western North Pacific. The stronger the TCs, the shorter the period for which they produce negative anomaly. The SST of central North Pacific is much positively correlated with the frequency of TCs, which shows that an intense vortex wind field of TCs can result in local mixing in the upper layers of the ocean and the Pacific Meridional Mode (PMM) for air-sea coupling can affect TCs.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 1
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot