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Climate Change Impacts on Heavy Snowfall in Sapporo Using 5-km Mesh Large Ensemble Simulations

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Title: Climate Change Impacts on Heavy Snowfall in Sapporo Using 5-km Mesh Large Ensemble Simulations
Authors: Kawazoe, Sho Browse this author
Inatsu, Masaru Browse this author
Yamada, Tomohito J. Browse this author
Hoshino, Tsuyoshi Browse this author
Issue Date: 5-Dec-2020
Publisher: 公益社団法人 日本気象学会 (Meteorological society of Japan)
Journal Title: SOLA (Scientific Online Letters on the Atmosphere)
Volume: 16
Start Page: 233
End Page: 239
Publisher DOI: 10.2151/sola.2020-039
Abstract: Synoptic circulation patterns associated with heavy snowfall events in Sapporo are examined using large ensemble simulation with 60-km global climate experiments. For snowfall, a 5-km dynamically downscaled model from the 20-km regional simulation is utilized. To identify synoptic circulation patterns, self-organizing maps (SOMs) are applied, and their response to a warming climate is examined. The authors find that heavy snow events predominantly occur due to low pressure anomalies to the north/east of Hokkaido or over central Japan, and by high pressure anomalies over the Siberian continent. The 4 K warming climate shows robust decreases in heavy snowfall amounts associated with low pressure anomalies over central Japan and increases in heavy snowfall amounts under patterns with high pressure anomalies over Siberia. This is attributed to surface air temperature characteristics in future climates, as precipitation in the former with surface winds transporting warm, moist air from the south and east, develops predominantly above 0 degrees C in the +4 K climate, while the latter, often resulting in intense snow band events, continues to be dominated by temperatures near or below zero.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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