Gravity wave emission in an atmosphere-like configuration of the differentially heated rotating annulus experiment
Gravity wave emission in an atmosphere-like configuration of the differentially heated rotating annulus experiment
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差热旋转环实验的类大气结构中的重力波发射
DOI：
10.1017/jfm.2014.528
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发表时间：
2014
影响因子：
3.7
通讯作者：
Fruman
中科院分区：
文献类型：
--
作者：
Borchert;Achatz U;Fruman
本文用经典差热旋转环空实验的有限体积模型研究了急流不平衡引起的重力波(GWS)的自发辐射，它可能是大气中重力波的一个重要来源，但对它没有令人满意的参数化。实验是使用经典的实验室配置进行的，并使用了一个更宽、更浅的环形空间，内壁和外壁之间的温差要大得多。后一种配置更像大气层，特别是因为Brunt-VäisäLä频率大于惯性频率，从而产生更真实的GW色散特性。在这两个实验中，使用二维版本的代码建立了斜压不稳定的轴对称状态来初始化模型，并允许发展以蜿蜒喷流为特征的低方位模斜压波。通过水平速度散度和气流小尺度结构的模式分解，确定了GW活动的可能区域。结果表明，GW活动在靠近圆柱内壁和斜压波的两个环空构型中都有。前者可归因于边界层不稳定，而后者可能部分源于斜压波的自发GW发射。
A finite-volume model of the classic differentially heated rotating annulus experiment is used to study the spontaneous emission of gravity waves (GWs) from jet stream imbalances, which may be an important source of these waves in the atmosphere and for which no satisfactory parameterisation exists. Experiments were performed using a classic laboratory configuration as well as using a much wider and shallower annulus with a much larger temperature difference between the inner and outer cylinder walls. The latter configuration is more atmosphere-like, in particular since the Brunt–Väisälä frequency is larger than the inertial frequency, resulting in more realistic GW dispersion properties. In both experiments, the model is initialised with a baroclinically unstable axisymmetric state established using a two-dimensional version of the code, and a low-azimuthal-mode baroclinic wave featuring a meandering jet is allowed to develop. Possible regions of GW activity are identified by the horizontal velocity divergence and a modal decomposition of the small-scale structures of the flow. Results indicate GW activity in both annulus configurations close to the inner cylinder wall and within the baroclinic wave. The former is attributable to boundary layer instabilities, while the latter possibly originates in part from spontaneous GW emission from the baroclinic wave.
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旋转圆柱环内斜压波流的实验室测量和数值模拟的比较
DOI：
--
发表时间：
1985
期刊：
影响因子：
--
作者：
By P. Hignett;A. A. White;R. D. Carter;W. D. N. Jackson;R. M. Small
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R. M. Small
影响因子：
3.7
作者：
V. Barcilon;J. Pedlosky
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J. Pedlosky
偶极涡旋内产生的惯性重力波
DOI：
--
发表时间：
2007
期刊：
影响因子：
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作者：
C. Snyder;D. Muraki;R. Plougonven;Fuqing Zhang
通讯作者：
Fuqing Zhang
影响因子：
20.6
作者：
HARRIS, FJ
通讯作者：
HARRIS, FJ
DOI：
10.1007/978-3-322-93899-2
发表时间：
1999
期刊：
--
影响因子：
--
作者：
A. Meister
通讯作者：
A. Meister