Abstract
Abstract In this study the role of nonlinear wave-wave interactions is investigated by performing two experiments using a numerical model adapted from that of Holton (1976). In the first experiment the model simulates a sudden stratospheric warming involving the interaction between the mean (zonally averaged) flow and a single zonal harmonic of wavenumber 1 which is forced at the lower boundary; presumably the tropopause level. In the second experiment the model includes an additional wave 2 which is not forced at the lower boundary but generated through nonlinear interaction between wave 1 and itself. This wave 2 interacts with both the mean flow and wave 1. However, zonal wavenumbers higher than 2 are all neglected. These two experiments are referred to as the linear and the nonlinear cases, respectively. The results are first described in an Eulerian framework. It is found that the simulated warming for the nonlinear case is more intense and rapid than that for the linear case. In order to describe how...
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