Characteristics of Synoptic Conditions for Heavy Snowfall in Western to Northeastern Japan Analyzed by the 5-km Regional Climate Ensemble Experiments

Journal of the Meteorological Society of Japan

Rui ITO¹  Koji DAIRAKU²  Takeshi YAMAZAKI³  Hiroaki KAWASE⁴  Takahiro SASAI⁵ 

[1] Integrated Research on Disaster Risk Reduction Division, National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan;Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan;Japan Meteorological Business Support Center, Tsukuba, Japan;Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan;Tohoku University, Sendai, Japan

关键词: heavy daily snowfall;    winter monsoon;    extratropical cyclone;    regional climate ensemble experiments;   

DOI  :  10.2151/jmsj.2018-022

学科分类：大气科学

来源: Meteorological Society of Japan

【 摘 要 】

 Geographical distributions of heavy snowfall, especially in the Pacific Ocean side of Japan, have not been previously elucidated due to low occurrence frequency of heavy snowfall and limited number of snow observation points. This study investigates the characteristics of synoptic conditions for heavy daily snowfall from western to northeastern Japan in the present climate, analyzing high-resolution regional climate ensemble experiments with 5-km grid spacing. The Japanese 55-year Reanalysis (JRA-55) and the 10-ensemble members of the database for Policy Decision making for Future climate change (d4PDF) historical experiments are applied to the lateral boundary conditions of the regional climate model. Dynamical downscaling using d4PDF (d4PDF-DS) enabled us to evaluate much heavier snowfall events than those simulated by dynamical downscaling using JRA-55 (JRA55-DS).

【 授权许可】

Unknown