| Summary: | application/pdf Using 51-year reanalysis data, we propose that the winter Western Pacific (WP) pattern, which brings about a warm and cold winter in Japan, is associated with the previous winter North Atlantic Oscillation (NAO).We focus on the Arctic sea-ice fluctuation and El Niño/Southern Oscillation (ENSO) related to the weather in Japan about the mechanism regarding the relationship of the winter WP with the winter NAO in the previous year. We calculate the lag correlation of the geopotential height, the sea-ice and the Sea Surface Temperature (SST)with the winter WP index which divided in to the low, middle and high frequency variations. The negative (positive) phase of the winter WP associates with the positive (negative) phase of the previous winter NAO. The positive (negative) phase of the low-frequency winter NAO variation impacts the sea-ice decrease (increase) in spring and summer while the middle-frequency NAO variation impacts the La Niña (El Niño) phenomenon in winter from summer. We suggest the winter NAO is a candidate for exciting the winter WP in the following winter through both the sea-ice and the ENSO. 三重大学大学院生物資源学研究科博士前期課程共生環境学専攻 27 thesis
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