Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1997-11-01 |
タイトル |
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タイトル |
STRATOSPHERIC SUDDEN WARMING IN 1989 FROM THE VIEWPOINT OF ATMOSPHERIC ANGULAR MOMENTUM |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ID登録 |
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ID登録 |
10.15094/00003981 |
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ID登録タイプ |
JaLC |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
論文名よみ |
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その他のタイトル |
STRATOSPHERIC SUDDEN WARMING IN 1989 FROM THE VIEWPOINT OF ATMOSPHERIC ANGULAR MOMENTUM |
著者名よみ |
/ ヤマザキ, コウジ
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著者名(英) |
SEOL, Dong-Il
YAMAZAKI, Koji
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著者所属(英) |
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en |
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Hokkaido University |
著者所属(英) |
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en |
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Hokkaido University |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
A major wavenumber-2 stratospheric sudden warming occurred in mid-February of 1989. Using the U. S. National Meteorological Center (NMC) data, an analysis of this event was performed based on the angular momentum equation in the transformed Eulerian-mean (TEM) formalism. Although the warming took place abruptly, the atmospheric angular momentum (AAM) of the Northern Hemisphere (NH) stratosphere above 100hPa started decreasing gently about 4 weeks before the warming. The decreasing occurred in the whole region of the NH stratosphere. During the decreasing period of the northern stratospheric AAM prior to the sudden warming, the global AAM also decreased and hence the length of day (LOD) decreased. The contribution of the global stratospheric AAM to the decreasing of the LOD was about 40-50%. Using the TEM formalism, the AAM budget in the NH stratosphere was investigated. The eddy forcing which can be represented as the Eliassen-Palm (E-P) flux vectors generally acts to decrease the AAM, and the residual mean meridional circulation acts in the opposite way. Analysis of the relationship between the stratospheric sudden warming and the AAM budget shows that the eddy forcing was enhanced gradually during the 4 weeks before the warming and contributed to the decreasing of the AAM. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA10756213 |
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
巻 11,
p. 178-198,
発行日 1997-11
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出版者 |
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出版者 |
National Institute of Polar Research |