Regional Difference of Year-to-Year Variations of Winter Rainfall in the Japan-Sea Side Region
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- TAKAHASHI Nobuto
- Institute of Geography, Graduate School of Science, Tohoku University
Bibliographic Information
- Other Title
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- 日本海側地域における冬季降水量の年々変動の地域性
- ニホンカイガワ ニ オケル トウキ コウスイリョウ ノ ネンネン ヘンドウ ノ チイキセイ
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Abstract
The Japan-Sea side region is known as much monsoonal rainfall, and there are regional differences of year-to-year variation in this region, but reasons for these are not investigated sufficiently. In this paper, at first, the Japan-Sea side region is divided into four subregions; ‘Hokkaido’, ‘Tohoku’, ‘Hokuriku’ and ‘San-in’.<br>Next, in each region, the relationship between rainfall and monsoon, and the relationship between rainfall and depression activities are examined. Monsoon Index (MOI) is difined as the 1, 000hPa heights difference between four pairs of points on different parallels of latitude over Japan Islands, and depression activities are shown as the distribution of depressions' passage frequencies.<br>The results are summarized as follows;<br>1) In ‘Hokkaido’ and ‘Hokuriku’, the main factor of rainfall variations is monsoon, while in ‘Tohoku’, it is Japan-Sea lows, and in ‘San-in’, it is Paciffic lows.<br>2) The rainfall variations' difference between ‘Hokkaido’ and ‘Hokuriku’ is caused by the secondary factor; that is Japan-Sea lows.<br>3) The relationship between rainfall and sea level pressure field or 500hPa height field correspond to the relationship between rainfall and the year-to-year rainfall variation factors such as monsoon and depression activities.
Journal
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- Quarterly Journal of Geography
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Quarterly Journal of Geography 52 (4), 272-282, 2000
The Tohoku Geographical Association
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Keywords
Details 詳細情報について
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- CRID
- 1390001204465094784
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- NII Article ID
- 10004952243
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- NII Book ID
- AN10379267
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- ISSN
- 18841252
- 09167889
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- NDL BIB ID
- 5629630
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed