Numerical Simulations of Mountain Waves in the Middle Atmosphere over the Southern Andes
Abstract
We use a two-dimensional nonlinear compressible mesoscale model to study mountain waves in the middle atmosphere over the southern Andes. Using realistic temperatures, winds and topography, the model generates large-amplitude long-wavelength breaking mountain waves in the middle atmosphere that compare favorably with satellite measurements. Modeled waves have preferred horizontal wavelengths. Spectral analysis reveals correspondences between these wavelengths and peaks in the spectrum of Andean topographic elevations. The shorter waves reach the stratosphere well before the longer ones, consistent with group velocity arguments, with longer wavelengths ultimately dominating. At later times we find evidence of downward propagating secondary waves produced by upper-level breaking of the primary waves.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2000
- Accession Number
- ADA527190
Entities
People
- Kwok-aun Tan
- Stephen D. Eckermann
Organizations
- United States Naval Research Laboratory