THE RELATIONSHIP BETWEEN NORTHEASTWARD SHIFT OF WINTER BLOCKING OVER THE NORTH PACIFIC AND DISTRIBUTION OF EXTREME LOW TEMPERATURE DAYS OVER SURROUNDING JAPAN UNDER FUTURE CLIMATES

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  • 気候変動に伴う冬季における太平洋ブロッキングの北東シフトと日本周辺の低温日との関係
  • キコウ ヘンドウ ニ トモナウ トウキ ニ オケル タイヘイヨウ ブロッキング ノ ホクトウ シフト ト ニホン シュウヘン ノ テイオンビ ト ノ カンケイ

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Abstract

 Atmospheric blocking causes extreme weather condition in the middle latitudes. A previous study mentioned that the winter blocking will shift northeastward over the North Pacific for future climate. This study investigates about the effects of the shifting of winter blocking on extreme events over surrounding Japan by utilizing Coupled Model Intercomparison Project Phase 5 datasets. In the 20th century climate, the winter blocking over the sea of Okhotsk tended to occur with extreme low temperature days over surrounding Japan, and it was predicted that the blocking will reduce in the future climates. It is revealed that the low temperature days over Japan will tend to occur with wide area and will decrease with blocking over the sea of Okhotsk in the future climate.

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