MEDIUM AND LONG TERM CHANGE CHARASTERISTICS OF WAVE AROUND HOKKAIDO COAST DUE TO WEATHER CHANGE

Abstract

 We studied medium and long term change charasteristics of wave around Hokkaido coast by weather change. Energy flux and maximum value of the significant wave height were longitudinally increased by global warming and etc.. Medium term change of mean wave directions are correlated with relative sunspot number and PDO index. Medium term change of wave energy fluxs are correlated with AO index. The change of wave direction can be estimated by the change of relative sunspot number with about ten years period.