THE INFLUENCE OF VARIATION OF SUBSURFACE OCEAN TEMPERATURE IN THE EQUATORIAL WESTERN PACIFIC WARM POOL ON TROPICAL CYCLONES

Using observed data, the authors have analyzed the impact of the variation of subsurface ocean temperature of the equatorial Western Pacific Warm Pool and South China Sea on the tropical cyclones. The results show that the number of tropical cyclones in the Western Pacific are more(or less)than the normai year, and their intensities also stronger(or weaker), when the subsurface ocean temperature of the equatorial Westem Pacific Warm Pool persistently shows positive(or negative)anomaly. This phenomena is especially evident in the extreme years, but effects of the phenomena on tropical cyclones in South China Sea are not obvious. At the same time, the forming of the tropical cyclones in the western and Northern Pacific and in South China Sea is often ahead of time (or postpones). Usually, when the subsurface ocean temperature in the north of South China Sea appears in the positive(or negative)anomaly, the number of tropical cyclones forming in South China Sea are more(or less).