An Intercomparison of Model-Predicted Wave Breaking for the 11 January 1972 Boulder Windstorm
| Autor: | Daniel B. Weber, Ming Xue, Chaing Chen, Brian A. Colle, M. G. Wurtele, Vanda Grubišić, D. Landau, Wu-Ron Hsu, G. S. Poulos, James D. Doyle, Dale R. Durran, M. Georgelin, Wen-Yih Sun, Ching Yuang Huang, Yuh-Lang Lin |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Monthly Weather Review. 128:901-914 |
| ISSN: | 1520-0493 0027-0644 |
| Popis: | Two-dimensional simulations of the 11 January 1972 Boulder, Colorado, windstorm, obtained from 11 diverse nonhydrostatic models, are intercompared with special emphasis on the turbulent breakdown of topographically forced gravity waves, as part of the preparation for the Mesoscale Alpine Programme field phase. The sounding used to initialize the models is more representative of the actual lower stratosphere than those applied in previous simulations. Upper-level breaking is predicted by all models in comparable horizontal locations and vertical layers, which suggests that gravity wave breaking may be quite predictable in some circumstances. Characteristics of the breaking include the following: pronounced turbulence in the 13–16-km and 18–20-km layers positioned beneath a critical level near 21-km, a well-defined upstream tilt with height, and enhancement of upper-level breaking superpositioned above the low-level hydraulic jump. Sensitivity experiments indicate that the structure of the wave bre... |
| Databáze: | OpenAIRE |
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