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タカヤ コウタロウ
TAKAYA KOTARO
高谷 康太郎 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 1997/12 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | A formulation of a wave-activity flux for stationary Rossby waves on a zonally varying basic flow |
| 執筆形態 | その他 |
| 掲載誌名 | GEOPHYSICAL RESEARCH LETTERS |
| 出版社・発行元 | AMER GEOPHYSICAL UNION |
| 巻・号・頁 | 24(23),pp.2985-2988 |
| 著者・共著者 | K Takaya,H Nakamura |
| 概要 | A new formulation of an approximate conservation relation is proposed for stationary Rossby waves on a zonally varying basic flow, utilizing that A (proportional to wave enstrophy:) and E (proportional to wave energy) are both. related to the wave activity pseudomomentum. For stationary Rossby waves, it is shown in the limit of a small-amplitude: plane wave on a slowly varying: unforced non-zonal flow that a particular linear combination of A and E, namely: M equivalent to (A + E)/2. is independent of the wave phase. even if unaveraged, and is conserved under steady unforced and nondissipative conditions. It is also shown. that the three-dimensional flux of M is parallel to the local group velocity in the WKB limit. The flux could be a useful diagnostic tool, as shown in an example that presents a ''snapshot'' of the three-dimensional propagation of a stationary Rossby wavetrain in the real atmosphere. Our conservation relation is a generalization of that for stationary Rossby waves on a zonally-uniform basic flow derived by Plumb. |
| ISSN | 0094-8276/1944-8007 |