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Updated: Jul 22, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
Published on: February 3, 2014
Transitions between blocked and zonal flows in a rotating annulus with topography
1E. R. Weeks, J. S. Urbach, H. L. Swinney, Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin, Austin, TX 78712, USA. Y. Tian, K. Ide, M. Ghil, Department of Atmospheric Sciences and Institute of Geophysi.
Atmospheric blocking occurs when westerly winds are deflected by anticyclones. Experiments show that jet-topography interactions in a rotating annulus can cause intermittent switching between blocked and zonal flow patterns.
Area of Science:
- Atmospheric Science
- Fluid Dynamics
- Geophysics
Background:
- Mid-latitude atmospheric circulation is characterized by prevailing westerly winds.
- Blocking anticyclones can disrupt zonal flow, persisting for extended periods.
- Understanding these phenomena is crucial for weather and climate prediction.
Purpose of the Study:
- To investigate the dynamics of atmospheric blocking using a laboratory model.
- To explore the role of jet-topography interactions in generating blocked and zonal flow patterns.
- To elucidate the mechanisms behind intermittent transitions between flow regimes.
Main Methods:
- Utilized a rotating annulus apparatus to simulate atmospheric dynamics.
- Employed radial pumping to establish a Coriolis-forced zonal jet.
- Introduced symmetric topographic ridges to influence the flow.
Main Results:
- High forcing levels resulted in predominantly zonal flow.
- Low forcing levels led to the development of blocked flow patterns.
- Observed intermittent switching between zonal and blocked states due to jet-topography interaction.
Conclusions:
- The rotating annulus experiments successfully replicate key features of atmospheric blocking.
- Jet-topography interactions are a significant factor in generating and maintaining blocked and zonal flow regimes.
- Findings provide insights into observed atmospheric behavior and numerical model results.
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