Graphical Abstract

Takahashi, C., Y. Imada, and M. Watanabe, 2022: Influence of the Madden-Julian Oscillation on wintertime extreme snowfall and precipitation in Japan. J. Meteor. Soc. Japan, 100,
https://doi.org/10.2151/jmsj.2022-014
Graphical Abstract NEW GA

 

Plain Language Summary: The Madden-Julian Oscillation (MJO) is the most dominant mode of tropical intraseasonal variability and can modulate extratropical weather. Here, we investigate the influences of the MJO on the occurrence probability and spatial distribution of wintertime extreme snowfall and precipitation in Japan, which has not been clarified so far, based on a large-ensemble dataset of global and regional model simulations. The MJO significantly modulates the occurrence probability of extreme snowfalls on the Sea of Japan side and Kanto region and extreme precipitation on the Pacific Ocean side. We reveal the physical processes driving the extremes associated with the MJO. This study suggests that good representation in models and monitoring of the MJO help improve the predictability of wintertime extreme precipitation and snowfall in Japan.

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