Studies on explosively developing cyclone activity around Japan andthe associated natural disasters

利用全球再分析数据（JRA 25/JCDAS），海洋表面通量数据（J-OFURO 2）和各种数值模式，阐明了日本附近爆发性气旋活动的总体特征，东亚冬季风变率和海表温度锋对爆发性气旋活动的共同影响，（3）爆发性气旋在强降雪/降水和反常波事件中的重要作用，并评估了（4）全球变暖条件下爆发性气旋活动与日本海沿岸强降雪发生频率的长期变化。此外，我们还建立了关于爆发性气旋及其相关自然灾害的数据库。

Using global reanalysis data (JRA25/JCDAS) , ocean surface flux data (J-OFURO2) and various numerical models, we clarified (1) the overall features of explosively developing cyclone activity in the vicinity of Japan, (2) the combined effects of the East Asian winter monsoon variability and sea surface temperature (SST) fronts on the explosive cyclone activity, (3) the important roles of the explosive cyclones in extremely heavy snowfall/rainfall and freak-wave events, and also assessed (4) the long-term changes of the explosive cyclone activity associated with the occurrence frequency of the heavy snowfall on the Japan Sea coast under global warming. In addition, we constructed the database on the explosive cyclones and the associated natural disasters.