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首页> 外文期刊>Journal of Physical Oceanography >The Structure of Baroclinic Modes in the Presence of Baroclinic Mean Flow
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The Structure of Baroclinic Modes in the Presence of Baroclinic Mean Flow

机译：存在斜压平均流的斜压模式的结构

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摘要

This contribution seeks to understand the vertical structure of linearized quasigeostrophic baroclinic modes when they are modified by the presence of a baroclinic mean flow and associated potential vorticity gradients. It is found that even modest, O(0.05 m s(-1)), mean flows can give rise to very substantial changes in modal structures, often in the sense of increased surface intensification. The extent to which stable modes are modified depends strongly on the direction of Rossby wave propagation. Further, baroclinically unstable solutions can appear, and a meaningful inviscid critical-layer solution can occur at the transition to instability when the horizontal gradient of potential vorticity changes sign at some depth within the water column. In addition, the gravest, n = 0, vertical stable mode is no longer strictly barotropic, but rather it can carry density variability at frequencies much higher than those possible for baroclinic (higher) Rossby wave modes. This finding appears to be consistent with oceanic current-meter observations that suggest temperature variability propagation even when the frequency is too high for traditional baroclinic Rossby waves to exist.
机译：当通过斜压平均流量和相关的潜在涡度梯度对线性准拟营养斜压模式进行修改时，该贡献旨在了解线性准斜压斜模式的垂直结构。结果发现，即使是适度的O（0.05 m s（-1）），平均流量也会引起模态结构的非常大的变化，通常是在表面强度增加的意义上。稳定模式的修改程度在很大程度上取决于Rossby波传播的方向。此外，可能出现斜压不稳定的解，并且当潜在涡度的水平梯度在水柱内的某个深度出现符号变化时，在向不稳定的过渡处可能会出现有意义的无粘性临界层解。另外，最重的n = 0垂直稳定模式不再严格地是正压模式，而是可以在比斜压（更高）Rossby波模式高得多的频率上进行密度变化。这一发现似乎与海洋电流表的观测结果相符，后者表明温度变异性传播，即使频率对于传统的斜压Rossby波来说也太高了。

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