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1
題名:A Study of Finite Amplitude Barotropic Instability    
著者:Hung-Chi KuoChung-Ho Horng
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:Barotropic instability ; Vortex merging ; Counter-propagating ; Rossby waves
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:5卷2期(1994.6)
頁碼:199-243
語言:英語
摘要: 英文摘要PDF

We report cases with a series of disturbances tilted upshear along the shear zone during the Mei-Yu season. The scale involved is much smaller than the local Rossby radius of deformation; we hypothesize the relevance of barotropic instability, and have explored the nonlinear evolution of barotropic instability. The small and finite amplitude theories are reviewed; their relevance to the observations are briefly discussed. Eigenvalues of ideal three and four region models are calculated analytically. A new Fourier Chebyshev nondivergent barotropic model is constructed. With the initial value problem approach, our experiments on barotropic instability with a vorticity strip either have hyperbolic tangent or Bickerly jet type of wind profiles. We studied the time evolution of the shear layers in terms of the formation of fundamental eddies and successive pairing or merging of eddies. The mutual intensification of counter-propagating Rossby waves (vorticity gradient waves) across the vorticity strip, breakdown of the vorticity strip, local concentration of vorticity and vortex mergering processes were simulated. While the barotropic instability is an efficient way to concentrate vorticity in a small region, the later vortex merging can enlarge the vortex sizes but not the intensity of the resultant vortex. We propose that the concentration and the merging of vortices can create a favorable localized environment within the shear zone for the moist baroclinic processes to operate. As far as the intensity, shape and evolution of the individual vortices are concerned, they are very sensitive to initial background noise (1/100 of mean vorticity). In other words, there is no predictability in the nonlinear evolution. However, the maximum growth rate and the dominant wavelength of vortex can be predicted from the linear analysis. The Bickerly jet possesses higher growth rate than the hyperbolic tangent case on the f plane. We document chaotic behavior of sudden breakup of shear zone and associated vortex merging after a couple of regular cycles of wave-mean flow interaction with shear zone maintained. In the thirty-day integration, the vortices on the β plane become disorganized and scattered while they still remain well organized on the f plane.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 5卷2期 (1994.6)
Convection and Mei-Yu Front/ Han-Ru ChoGeorge T. J. Chen
On the Formation of Cloud and Precipitation Systems in Taiwan During TAMEX IOP #11/ Ching-Sen ChenYuet-On E. Chan
Mountain-Originated Mesoscale Precipitation System in Northern Taiwan: A Case Study 21 June 1991/ Ben Jong-Dao Jou
A Study of Finite Amplitude Barotropic Instability/ Hung-Chi KuoChung-Ho Horng
Numerical Prediction of a Bangladesh Tropical Cyclone/ T. N. KrishnamurtiDarlene OosterhofDusadee Sukawat
The Detection of Active Faults on Taiwan Using Shallow Reflection Seismics/ Chien-Ying WangGuey-Pao ChenDa-Tong Jong
Near-Source Ground Motion of a Propagating Rupture Fault from the Finite Element Modeling/ Bor-Shouh HuangYeong Tein Yeh
Orography Effects on the Structure of Typhoons: Analyses of Two Typhoons Crossing Taiwan/ Ching-Yen Tsay
Current on the Edge of the Continental Shelf Northeast of Taiwan/ Tswen Yung TangWen Tzu Tang
 
   
 
   

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