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- W2085253606 abstract "A weakly radiating theory is developed to describe the decay of a westward propagating dipole modon on a β plane in the case of small β. The barotropic vorticity equation is expanded about an ‘‘f-plane’’ (β=0) modon using the expansion parameter ε=βL2/U. The theory also assumes shape preservation of the modon. An expression is found for the energy loss from the dipole due to Rossby wave radiation. Two alternative constraints, one involving global enstrophy conservation and the other assuming conservation of the maximal vorticity values in the center of the dipole vortices, are used to derive expressions for the decay rate of the dipole. In both cases, the predicted decay is algebraic in time. These theories are tested in a numerical model for various values of c. It is found that enstrophy conservation is not a good constraint because fluid leaks from the dipole in filaments whose small scales ensure loss through numerical dissipation. The theory based on the conservation of peak vorticity works well for small ε=0.2, and gives reasonable results for much larger values, up to ε=1.0. The theory is used to estimate the decay time of atmospheric blocking due to this radiation phenomenon, and the implied effect is significant." @default.
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- W2085253606 date "1994-10-01" @default.
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- W2085253606 title "The decay of modons due to Rossby wave radiation" @default.
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