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This paper describes relationships between Nino 3 sea water temperature (SST) and statistical characteristics of daily rainfalls in Tokyo. Daily rainfall series for 1961-2002 is separated the series in the years with positive SST-anomalies from the one in the years with negative SST-anomalies. The frequency analysis based on partial duration series is carried out individually. The quantiles in the years with negative SST-anomalies are 1.68-2.35 times as large as the ones in the years with the positive SST-anomalies, indicating that the heavy rainfall events occur frequently in the years with negative SST-anomalies. Despite the condition of no artificial factor in the climate changes such as a global warming, the numerical simulation results using the ocean-atmosphere coupled general circulation model also show that the daily rainfall series in Tokyo is unstationary.

RELATIONSHIPS BETWEEN NIÑO 3 SEA SURFACE TEMPERATURE AND STATISTICAL CHARACTERISTICS OF HEAVY RAINFALLS IN TOKYO