Basin Resonances in the Equatorial Indian Ocean
Basin Resonances in the Equatorial Indian Ocean
复制标题
DOI：
10.1175/2011jpo4591.1
复制
发表时间：
2011-06
影响因子：
3.5
通讯作者：
W. Han;J. McCreary;Y. Masumoto;J. Vialard;B. Duncan
中科院分区：
文献类型：
--
作者：
W. Han;J. McCreary;Y. Masumoto;J. Vialard;B. Duncan
摘要前人研究了赤道印度洋（IO）的第二斜压模态（n = 2）Kelvin波和Rossby波如何相互作用，形成半年（180天）和90天周期的海盆共振。本文探讨了这些共振尚未解决的问题，包括90天共振集中在东部海洋的原因，其建立的时间尺度，以及复杂的盆地几何形状的影响。海洋模型的层次结构：一个理想化的一维（1D）模型，线性连续分层海洋模型（LCSM），和海洋环流模型（OGCM）迫使快速散射仪（QuikSCAT）风在2000-08年。结果表明，东盆集中的90天的共振发生，因为西向传播的Rossby波是较慢的，因此阻尼比东向传播的开尔文波。与其它斜压模态的叠加，进一步增强了东部最大值，减弱了海平面。
AbstractPrevious studies have investigated how second-baroclinic-mode (n = 2) Kelvin and Rossby waves in the equatorial Indian Ocean (IO) interact to form basin resonances at the semiannual (180 day) and 90-day periods. This paper examines unresolved issues about these resonances, including the reason the 90-day resonance is concentrated in the eastern ocean, the time scale for their establishment, and the impact of complex basin geometry. A hierarchy of ocean models is used: an idealized one-dimensional (1D) model, a linear continuously stratified ocean model (LCSM), and an ocean general circulation model (OGCM) forced by Quick Scatterometer (QuikSCAT) wind during 2000–08. Results indicate that the eastern-basin concentration of the 90-day resonance happens because the westward-propagating Rossby wave is slower, and thus is damped more than the eastward-propagating Kelvin wave. Results also indicate that superposition with other baroclinic modes further enhances the eastern maximum and weakens sea level ...