Abstract
The wave observation on the Japanese coast through the Nationwide Ocean Wave information network for Port and HArbourS (NOWPHAS) has been conducted since 1970. The wave data were accumulated for 30 years or longer at the 20 observation sites or more. According the former research, it is difficult to find a high correlation between the wave statistics, such as, the mean and maximum significant waves, and the storm frequency, at an observation site and climatic indexes, such as SST, PDOI, NPI, SOI, AOI, and the typhoon genesis and landfall frequencies. This study, therefore, divided the 24 observation site into three regions on the Sea of Japan and four ones on the Pacific Ocean. Then, this study examined the correlation of the wave statistics at each region with the climatic indexes. The major conclusions are as follows.
(1) The mean significant wave height has the highest correlation with SST among these climatic indexes.
(2) The correlation of the mean significant wave period with the climate change indexes is higher than that of the mean siginificant wave height.
(3)The correlation of maximum significant waves with the climate change indexes is low except for the typhoon landfall frequency.
(4) The correlation of the frequency of major storm events with the climate change indexes is low except for the typhoon landfall frequency and SOI.
