Reflection and transmission of equatorial Rossby waves
Reflection and transmission of equatorial Rossby waves
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DOI：
10.1175/jpo-2691.1
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发表时间：
2005-03
影响因子：
3.5
通讯作者：
M. Spall;J. Pedlosky
中科院分区：
文献类型：
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作者：
M. Spall;J. Pedlosky
摘要利用浅水数值模式和支持理论研究了赤道Rossby波与西边界上开有一个或多个窄缝的相互作用。据发现，很少的入射能通量被反射到向东传播的赤道开尔文波，提供至少一个间隙位于约赤道的变形半径内。由于岛屿周围的环流定理，赤道附近第二个间隙的存在减少了短罗斯贝波的反射，并增强了入射能量向西部盆地的传输。向西传输的能量经过最东端的岛屿后，在遇到西边的岛屿时会进一步减少，即使这些岛屿完全位于最东端岛屿的“阴影”内。一个本地补丁的风强迫也被用来产生低频Rossby波的情况下，岛屿配置代表西赤道太平洋。For ...
Abstract The interaction of equatorial Rossby waves with a western boundary perforated with one or more narrow gaps is investigated using a shallow-water numerical model and supporting theory. It is found that very little of the incident energy flux is reflected into eastward-propagating equatorial Kelvin waves provided that at least one gap is located within approximately a deformation radius of the equator. Because of the circulation theorem around an island, the existence of a second gap off the equator reduces the reflection of short Rossby waves and enhances the transmission of the incident energy into the western basin. The westward energy transmitted past the easternmost island is further reduced upon encountering islands to the west, even if these islands are located entirely within the “shadow” of the easternmost island. A localized patch of wind forcing was also used to generate low-frequency Rossby waves for cases with island configurations representative of the western equatorial Pacific. For ...