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ID 53195
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タイトル(別表記)
A preliminary study on the seasonal cycles of the cyclone activity and the large-scale fields in Europe at the viewpoint comparing with those in East Asia
フルテキストURL
著者
瀧川 優実 岡山大学教育学部(理科)
垪和 優一 岡山大学大学院教育学研究科自然教育学系(理科)
松本 健吾 岡山大学教育学部(理科)
加藤 内藏進 岡山大学大学院教育学研究科自然教育学系(理科) Kaken ID researchmap
抄録
 Preliminary analyses on the seasonal cycles of the large-scale atmospheric mean fields and the cyclone activity in Europe were performed based mainly on the NCEP/NCAR re-analysis data, at the viewpoint comparing with those in East Asia.  As for the climatological monthly mean fields (1981~2010), the meridional temperature gradient in East Asia presents striking seasonal change with the maximum in winter and the minimum in summer. It is interesting that such transition from winter to summer and that from summer to winter occur rather rapidly accompanied by the great temperature increase around April to June and the decrease around October to November, respectively, in a wide region of 40~70N. On the other hand, the temperature gradient in Europe is significantly smaller with slight seasonal change than that in East Asian winter.  By the way, in spite of the above difference of the horizontal temperature gradient between Europe and East Asia, the cyclone activity does not seem to be so weak even around Europe. Thus, the seasonal cycles of the characteristics of the cyclones and their environmental fields around Europe were examined. At the first step, we analyzed the daily cyclone activity in Europe for January and July of 2000. Many low pressure centers at the surface level appeared in both January and July. Referring also to the daily maps of sea level pressure and geopotential height at 500 hPa level, we found that not only the cyclones corresponding to the baroclinic instability waves, but also to the cold vortices which amplitudes increased with height appeared frequently. Moreover, it is interesting that the large-scale cold vortex, which embeds the shortwave trough with the low center at the surface level, appeared in the northern Europe in July as in East Asian winter, when such multi-scale systems sometimes bring the persisting heavy snowfall events in the Japan Sea side of the Japan Islands.
キーワード
seasonal cycle
cyclone activity
Europe and East Asia
出版物タイトル
Okayama University Earth Science Report
発行日
2014-12-27
21巻
1号
出版者
岡山大学理学部地球科学教室
出版者(別表記)
Department of Earth Sciences, Faculty of Science, Okayama University
開始ページ
23
終了ページ
32
ISSN
1340-7414
NCID
AN10506284
資料タイプ
紀要論文
OAI-PMH Set
岡山大学
言語
日本語
著作権者
© 2014 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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publisher
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無し
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Eprints Journal Name
esr