PRELIMINARY STUDY OF THE RELATIONSHIP BETWEEN PRECIPITATION OVER JAPAN AND Niño 3 SEA SURFACE TEMPERATURE

Abstract

This study explores preliminarily the relationship between precipitation in the three regions of Japan and Niño 3 sea surface temperature (SST). The 87-year data set of precipitation and SST are analysed using wavelet analysis. The strong local wavelet power spectrum of precipitation using Morlet wavelet shows significant signals in 2-4 year periods. Decadal variations of the significant power spectrum are found in all reagions and seasons. The decadal power spectrum variations in winter in Kyushu are due to the Rossby wave excited by the tropical SST anomaly.