An experimental investigation into topographic resonance in a baroclinic rotating annulus
An experimental investigation into topographic resonance in a baroclinic rotating annulus
复制标题
斜压旋转环面地形共振的实验研究
DOI：
10.1080/03091929.2015.1055476
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发表时间：
2015
影响因子：
1.3
通讯作者：
Marshall S
中科院分区：
文献类型：
--
作者：
Marshall S
本文记录了一个实验研究，其中差热旋转环实验被用来研究地形对流体流动的影响，类似于地球和其他行星上的大气和海洋环流的条件下。特别是，受Jin和Ghil（J. Atmos.）等著作中悬而未决的问题的启发，研究了地形共振效应与低频变异性（LFV）的存在和产生机制之间的关系。科学，1990，47）和Read和Risch（Geophys.占星术。流体动力学，2011，105）。虽然采用正弦波数-3地形的一个新的制度内遇到的一个区域内的固定波数-3结构摆动。被称为“静止过渡”制度，它的特点是占主导地位的稳定波数3流和轴对称或混沌流之间的周期性振荡。进一步的研究发现，“平稳过渡”制度似乎是一个近共振区，非线性地形共振不稳定性导致23-42“天”的振荡行为。在该区域内，发现了一个Hopf分叉序列，并且发现非线性不稳定性在波带流和波-波相互作用中都有项，包括一个显著的共振波三波。这份报告总结了“定态过渡”制度的性质，并与其他实验研究中发现的LFV类似制度以及大气中的季节内振荡进行了比较。
This paper documents an experimental investigation in which a differentially-heated rotating annulus experiment was used to investigate the effects of topography on fluid flow under conditions similar to the atmospheric and oceanic circulation on Earth and other planets. In particular, the relationship between the effects of topographic resonance and the existence and mechanism for generation of low-frequency variability (LFV) were studied, motivated by outstanding questions in works such as Jin and Ghil (J. Atmos. Sci., 1990,47) and Read and Risch (Geophys. Astrophys. Fluid Dyn., 2011,105). Whilst employing sinusoidal wavenumber-3 topography a new regime was encountered within a region of stationary wavenumber-3 structural vacillation. Denoted as the “stationary-transition” regime, it featured periodic oscillations between a dominant stationary wavenumber-3 flow and axisymmetric or chaotic flow. Further investigation found that the “stationary-transition” regime appeared to be a near-resonant region where nonlinear topographic resonant instability led to a 23–42 “day” oscillatory behaviour. Within the regime, a Hopf bifurcation sequence was discovered, and the nonlinear instabilities were found to have terms in both wave-zonal flow and wave–wave interactions, including a notable resonant wave-triad. This report summarises the nature of the “stationary-transition” regime, and also makes comparisons with similar regimes of LFV found in other experimental studies, as well as intraseasonal oscillations in the atmosphere.
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