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  1. 防災科研関係論文

Factors affecting the inland and orographic enhancement of sea-effect snowfall in the hokuriku region of Japan

https://nied-repo.bosai.go.jp/records/6727
https://nied-repo.bosai.go.jp/records/6727
02146b7d-0747-4e28-b715-a37e7cb0fd58
Item type researchmap(1)
公開日 2024-08-19
タイトル
言語 en
タイトル Factors affecting the inland and orographic enhancement of sea-effect snowfall in the hokuriku region of Japan
言語
言語 eng
著者 Peter G. Veals

× Peter G. Veals

en Peter G. Veals

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W. James Steenburgh

× W. James Steenburgh

en W. James Steenburgh

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Sento Nakai

× Sento Nakai

en Sento Nakai

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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抄録
内容記述タイプ Other
内容記述 The Hokuriku region along the west coast of the Japanese island of Honshu receives exceptionally heavysnowfall accumulations, exceeding 500 cm from December to February near sea level and 1300 cm at highelevation sites, much of which is produced by sea-effect systems. Though the climatological enhancement ofsnowfall is large, the lowland-upland snowfall distribution within individual storms is highly variable,presenting a challenge for weather forecasting and climate projections. Utilizing data from a C-band surveillance radar, the ERA5 reanalysis, and surface precipitation observations, we examine factors affecting theinland and orographic enhancement during sea-effect periods in the Hokuriku region during nine winters(December-February) from December 2007 to February 2016. The distribution and intensity of precipitationexhibits strong dependence on flow direction due to three-dimensional terrain effects. For a given flow direction, higher values of boundary layer wind speed and sea-induced CAPE favor higher precipitation rates, amaximum displaced farther inland and higher in elevation, and a larger ratio of upland to lowland precipitation.These characteristics are also well represented by the nondimensional mountain height Ĥ, with Ĥ, 1 associatedwith a precipitation maximum over the high elevations and a larger ratio of upland to lowland precipitation, andĤ. 1 having the opposite effect. Nevertheless, even in high enhancement periods, precipitation rates decline asone moves inland from the first major mountain barrier, even over high terrain. These results highlight how theinterplay between sea-effect and orographic processes modulates the distribution and intensity of precipitation inan area of complex and formidable topography.
言語 en
書誌情報 en : Monthly Weather Review

巻 147, 号 9, p. 3121-3143, 発行日 2019
出版者
言語 en
出版者 American Meteorological Society
ISSN
収録物識別子タイプ ISSN
収録物識別子 1520-0493
DOI
関連識別子 10.1175/MWR-D-19-0007.1
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