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| 学位授与大学 |
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| 概要 |
The interaction between migrating baroclinic waves and stationary vortices produced by a simple-shape orography was investigated through laboratory experiments using a rotating annulus of fluid. Inves...tigation was made of the transition from an upper symmetric to a wave regime. Examination was conducted of the heat flux, the structure of stationary vortices and baroclinic waves along with the time-dependent behavior of the baroclinic waves. For a given zonal wavenumber the transition from an up-per symmetric to a wave regime occurred at a lower thermal Rossby number in the skewed field than in the axisymmetric field. This exhibits the stabilizing effect of the orography, which is consistent with the results by Jonas (1981). The structure of baroclinic waves showed a dependence on the zonal direction, that is, amplification occurred on the lee side of the obstacle, confirming the results of a linear theory by Frederiksen (1979) and Niehaus (1980).続きを見る
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1. Introduction 2. Experimental apparatus and measuring technique 3. Transition, heat flow measurement and surface flow pattern 4. Meridional distribution of the basic and perturbed temperature field 5. Azimuthal structure of the basic and perturbed temperature fields and the time-dependent behavior of each Fourier mode 6. Forced baroclinic waves due to orography : linear theory 7. Vertical structure 8. Summary and discussions
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