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Atmospheric resonance waves over the Sea of Cortés: An experimental case study
Arnold, Stephen Leslie
Dorman, Clive E.
Marshall, C. Monte
Mahaffy, Joseph M.
It is well accepted that obstacles in a uniform flow can induce lee-waves, resonance waves ("trapped" lee-waves), rotors, clear-air turbulence (CAT), and many other phenomena in the downstream flow. The nature and diversity of the observed phenomena depends mostly on the temperature and velocity structure of the incoming flow, and to some extent on the size and shape of the obstacle. There is a large body of literature, both observational and theoretical, examining the various aspects of airflow over topography. Most studies, however, have not given a detailed treatment of how well the theoretical models fit a given set of observations. The laminar flow zone to the lee of a mountain range has been investigated through analysis of upstream soundings at Guadalupe Island and soundings made directly in the lee of a 1600 meter high peak near Bahia de Los Angeles, Baja California. Norte, Mexico. Wave structure and vertical velocities measured in the lee are compared to theoretical predictions of a two-layer model, simple airstream analysis, and the qualitative flow features of an "infinite-depth" fluid. The two layer model has some minor difficulties because of the lack of a boundary layer and predicts no wave solutions except when only the first term of the Scorer parameter is used as input; the agreement with the measured wavelength is well within an order of magnitude. The simple airstream analysis yields the incoming airstream wavelength as a function of height, with the minimum occurring at the inversion height. If this value is compared to the measured wavelength the agreement is very good. The fluid analysis is also in very good agreement with the observed flow, and could be developed into a useful prognostic tool.
San Diego State University
Master of Science (M.S.) San Diego State University, 1990
Atmospheric resonance waves
North America – Mexico – Baja California – Bahía de Los Angeles
North America – Mexico – Baja California – Guadalupe Island
Guadalupe Island 29.023891N-118.272849W
Bahía de Los Angeles 29.043028N-113.374571W
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