期刊名称：Tellus A: Dynamic Meteorology and Oceanography
电子版ISSN：1600-0870
出版年度：1998
卷号：50
期号：1
页码：109-123
DOI：10.3402/tellusa.v50i1.14515
摘要：It has been well-demonstrated that many flat-bottomed ocean models possess interdecadaloscillatory solutions. Recently, propagation of viscous (or coarsely resolved) Kelvin wavesaround the boundary has been implicated in the oscillations. In this paper, we examine howthe mean state affects the character of the oscillation. We find that the stratification along thenorthern boundary has a large effect upon the oscillation. Mean states with an essentiallyunstratified north-east corner, lead to long period oscillations as the viscous boundary waveslowly crosses the northern boundary. Conversely, mean states with a stratified north-eastcorner, but unstratified north-west corner, lead to short-period, but larger-amplitude, oscillationssince boundary wave propagation is arrested only in the north-west corner.We demonstatethat the different character of oscillations under different zonal redistributions of a diagnosedflux are a consequence of the different mean states induced by the redistribution.
