Decomposing the Atmospheric Flow Using Potential Vorticity Framework
Decomposing the Atmospheric Flow Using Potential Vorticity Framework
复制标题
使用位涡框架分解大气流
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
J. Kaurola
中科院分区：
文献类型：
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作者：
E. Holopainen;J. Kaurola
摘要 在准地转框架内，使用位涡（PV）可逆原理以各种方式正式划分观测到的大气流。第一种方法将内部 PV 和下边界温度的贡献分开。在文献中，这种方法主要应用于一些理想化的流。然而，在实际情况中，这种划分似乎是有问题的，因为边界处的任何非零温度异常自动意味着内部 PV 的非零稳定性部分，因此，这两种贡献在本质上永远不会相互独立地发生。在大的水平尺度上，这两种贡献在每个层面上都有很大的幅度，并且几乎相互抵消。第二种方法将 3D 流分解为涡量和 PV 稳定性部分的贡献。这种形式划分本质上是将流分解为正压和斜压部分。第三种方法探讨了...
Abstract The invertibility principle of potential vorticity (PV) is used, within a quasigeostrophic framework, to formally partition the observed atmospheric flow in various ways. The first method separates the contributions of the interior PV and temperature at the lower boundary. In the literature, this approach has mainly been applied to some idealized flows. In real situations, however, this partitioning appears questionable because any nonzero temperature anomaly at the boundary automatically implies a nonzero stability part of the interior PV and, hence, these two contributions never occur independent of each other in nature. At large horizontal scales, the two contributions have a large amplitude at every level and almost cancel each other. The second method decomposes the 3D flow into contributions arising from the vorticity and the stability parts of the PV. This formal partitioning appears essentially to decompose the flow into its barotropic and baroclinic part. The third method explores the ro...