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Dynamic Characteristics of Regional Flows around the Pyréénéées in View of the PYREX Experiment. Part II: Solution of a Linear Model Compared to Field Measurements

Dynamic Characteristics of Regional Flows around the Pyréénéées in View of the PYREX Experiment.... This paper considers a linear hydrostatic model of a stable, uniform, constant rotational airflow over three- dimensional, elliptic, cross-sectional families of mountains in a z system. The surface pressure and the winds that are induced around the mountain chain are deduced using Fourier representation in both horizontal directions. The surface pressure perturbations and the induced wind intensities are linked to 1) the incoming airmass thermodynamic properties through Froude and Rossby numbers, 2) the geometrical aspect ratio of the mountain, 3) the direction of incidence of the incoming flow relative to the mountain orientation, and 4) the Coriolis effect through the Rossby number. The balance between the different factors that contribute to the morphology of the pressure and wind fields was established for northerly and southerly incoming flows that were blocked by an elliptical barrier resembling the Pyréénéées mountain chain. Fair agreement was found between the results of the model and the experimental data collected during PYREX (Pyréénéées experiment) intensive operational periods, with special regard to the asymmetry of the lateral flow for northerly incoming air masses. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Meteorology American Meteorological Society

Dynamic Characteristics of Regional Flows around the Pyréénéées in View of the PYREX Experiment. Part II: Solution of a Linear Model Compared to Field Measurements

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Publisher
American Meteorological Society
Copyright
Copyright © 1996 American Meteorological Society
ISSN
1520-0450
DOI
10.1175/1520-0450(1998)037<0053:DCORFA>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

This paper considers a linear hydrostatic model of a stable, uniform, constant rotational airflow over three- dimensional, elliptic, cross-sectional families of mountains in a z system. The surface pressure and the winds that are induced around the mountain chain are deduced using Fourier representation in both horizontal directions. The surface pressure perturbations and the induced wind intensities are linked to 1) the incoming airmass thermodynamic properties through Froude and Rossby numbers, 2) the geometrical aspect ratio of the mountain, 3) the direction of incidence of the incoming flow relative to the mountain orientation, and 4) the Coriolis effect through the Rossby number. The balance between the different factors that contribute to the morphology of the pressure and wind fields was established for northerly and southerly incoming flows that were blocked by an elliptical barrier resembling the Pyréénéées mountain chain. Fair agreement was found between the results of the model and the experimental data collected during PYREX (Pyréénéées experiment) intensive operational periods, with special regard to the asymmetry of the lateral flow for northerly incoming air masses.

Journal

Journal of Applied MeteorologyAmerican Meteorological Society

Published: Jul 29, 1996

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