Untangling waves and vortices in the atmospheric kinetic energy spectra
Untangling waves and vortices in the atmospheric kinetic energy spectra
复制标题
解开大气动能谱中的波和涡旋
DOI：
10.1017/jfm.2019.1060
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发表时间：
2020
影响因子：
3.7
通讯作者：
Michael L. Waite
中科院分区：
文献类型：
--
作者：
Michael L. Waite
大气中尺度动能谱的斜率为-5/3，表明存在能量级联。但这一级联的潜在动力仍然没有完全理解。它是由惯性重力波、漩涡还是其他什么东西驱动的？为了回答这些问题，有必要将频谱分解为波和涡的贡献。线性分解是直接的，但可能导致模糊的结果。Wang和Bühler最近的一篇论文（J. Fluid Mech.，Vol.882，2020，A16）通过使用Ω方程将能谱非线性分解为波和涡流来解决这个问题。他们将这种方法用于一维飞机数据，并将其应用于两个数据集。在平流层低层，结果表明，中尺度谱占主导地位的波。对流层上部的情况则不同：在这里，涡和波一样重要，甚至可能比波更重要，尽管一维数据的局限性排除了一个确定的答案。
The kinetic energy spectrum in the atmospheric mesoscale has a - 5/3 slope, which suggests an energy cascade. But the underlying dynamics of this cascade is still not fully understood. Is it driven by inertia–gravity waves, vortices or something else? To answer these questions, it is necessary to decompose the spectrum into contributions from waves and vortices. Linear decompositions are straightforward, but can lead to ambiguous results. A recent paper by Wang & Bühler (J. Fluid Mech., vol. 882, 2020, A16) addresses this problem by presenting a nonlinear decomposition of the energy spectrum into waves and vortices using the omega equation. They adapt this method for one-dimensional aircraft data and apply it to two datasets. In the lower stratosphere, the results show a mesoscale spectrum dominated by waves. The situation in the upper troposphere is different: here vortices are just as important, or possibly more than important, as waves, although the limitations of the one-dimensional data preclude a definitive answer.
影响因子：
3.7
作者：
Wang, Han;Bühler, Oliver
通讯作者：
Bühler, Oliver