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03091929.2010.512559.pdf | 3.8 MB | Adobe PDF | 見る/開く |
タイトル: | Retrograde equatorial surface flows generated by thermal convection confined under a stably stratified layer in a rapidly rotating spherical shell |
著者: | Takehiro, Shin-Ichi https://orcid.org/0000-0002-0857-3992 (unconfirmed) Yamada, Michio Hayashi, Yoshi-Yuki |
著者名の別形: | 竹広, 真一 |
キーワード: | Mean zonal flows Stably stratified layer Angular momentum budget Viscous diffusion |
発行日: | 19-Oct-2010 |
出版者: | Taylor & Francis |
誌名: | Geophysical & Astrophysical Fluid Dynamics |
巻: | 105 |
号: | 1 |
開始ページ: | 61 |
終了ページ: | 81 |
抄録: | Finite-amplitude thermal convection in a rapidly rotating spherical shell associated with a stably stratified layer placed near the outer surface is investigated. Systematic numerical experiments are performed with an Ekman number of E = 10−3, a Prandtl number of P = 1 and an inner/outer radius ratio of η = 0.4, and the existence of a strongly stratified upper layer is shown to enhance the generation of equatorial surface retrograde flows when the Rayleigh number is approximately ten times larger than the critical value. The existence of the stable layer causes the bottom of the stable layer to behave as a virtual boundary for the convective motion underneath. Its effective dynamic condition varies from the free-slip condition to the no-slip condition as the Rayleigh number increases. The Reynolds stress of the convective vortices beneath the stable layer is weakened and is dominated by the transport of the planetary angular momentum. As a result, the latitudinal temperature gradient produced at the bottom of the stable layer induces the equatorial retrograde flow through the thermal wind balance. This diffuses through the stable layer by viscosity and produces the equatorial surface retrograde flow. |
著作権等: | The Version of Record of this manuscript has been published and is available in Geophysical & Astrophysical Fluid Dynamics (2011) http://www.tandfonline.com/10.1080/03091929.2010.512559 この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/197333 |
DOI(出版社版): | 10.1080/03091929.2010.512559 |
出現コレクション: | 学術雑誌掲載論文等 |
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