A Fluid Experiment of Large-Scale Topography Effect on Baroclinic Wave Flows

Guoqing Li; Robin Kung; Richard L. Pfeffer

doi:10.1007/BF02656926

Impact Factor: 5.8

Volume 9 Issue 1

Jan. 1992

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1992 > 9(1): 17-28

A Fluid Experiment of Large-Scale Topography Effect on Baroclinic Wave Flows

1.
Institute of Atmospheric Physics, Academia Sinica, Beijing, China,Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, Florida, U. S. A.,Geophysical Fluid Dynamics Institute and Department of Meteorology, Florida State University, Tallahassee, Florida, U. S. A.

doi: 10.1007/BF02656926

Abstract
References
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Abstract:
The effects of topography on baroclinic wave flows are studied experimentally in a thermally driven rotating annulus of fluid.Fourier analysis and complex principal component (CPC) analysis of the experimental data show that, due to topographic forcing, the flow is bimodal rather than a single mode. Under suitable imposed experimental parameters, near thermal Rossby number ROT = 0.1 and Taylor number Ta = 2.2 × 107, the large-scale topography produces low-frequency oscillation in the flow and rather long-lived flow pattern resembling blocking in the atmospheric cir-culation. The ‘blocking’ phenomenon is caused by the resonance of travelling waves and the quasi-stationary waves forced by topography.The large-scale topography transforms wavenumber-homogeneous flows into wavenumber-dispersed flows, and the dispersed flows possess lower wavenumbers.
References

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Manuscript History

Manuscript received: 10 January 1992

Manuscript revised: 10 January 1992

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

A Fluid Experiment of Large-Scale Topography Effect on Baroclinic Wave Flows

1. Institute of Atmospheric Physics, Academia Sinica, Beijing, China,Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, Florida, U. S. A.,Geophysical Fluid Dynamics Institute and Department of Meteorology, Florida State University, Tallahassee, Florida, U. S. A.

Manuscript received: 1992-01-10
Manuscript revised: 1992-01-10

Abstract: The effects of topography on baroclinic wave flows are studied experimentally in a thermally driven rotating annulus of fluid.Fourier analysis and complex principal component (CPC) analysis of the experimental data show that, due to topographic forcing, the flow is bimodal rather than a single mode. Under suitable imposed experimental parameters, near thermal Rossby number ROT = 0.1 and Taylor number Ta = 2.2 × 107, the large-scale topography produces low-frequency oscillation in the flow and rather long-lived flow pattern resembling blocking in the atmospheric cir-culation. The ‘blocking’ phenomenon is caused by the resonance of travelling waves and the quasi-stationary waves forced by topography.The large-scale topography transforms wavenumber-homogeneous flows into wavenumber-dispersed flows, and the dispersed flows possess lower wavenumbers.