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Ronald B. Smith, Bryan K. Woods, Jorgen Jensen, William A. Cooper, James D. Doyle, Qingfang Jiang, and Vanda Grubišić

(e.g., Salathé and Smith 1992 ). The displacement estimates provide one method for testing the linearity of the waves. We define the nondimensional nonlinearity parameter A = Nη M / U . A typical low stratosphere value is A = (0.02 s −1 )(1000 m)/ (35 m s −1 ) ≈ 0.6, so that nonlinear effects are important but not dominant at the observed altitudes. Further aloft, as the wind speed decreases, A exceeds unity and the wave will become more nonlinear. 4. Conserved variable diagrams If the

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