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Stevens T. Chan and Martin J. Leach

) . In addition to model evaluation studies, our model has also been used to investigate the effects of inflow turbulence on dispersion scenarios involving nighttime releases under light and highly variable winds, such as the case of intensive operation period (IOP) 7 of the Urban 2000 experiment ( Allwine et al. 2002 ). Through a series of controlled numerical experiments with variations in time-dependent forcing and turbulence intensity from the inflow boundary, Chan and Leach (2004) demonstrated

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Steve R. Diehl, Donald A. Burrows, Eric A. Hendricks, and Robert Keith

corners of the MESO cell has its own velocity vector. The tracer velocity is then estimated by interpolating among the eight corners of the cell. The interpolation scheme assumes the flow is detached at the building edges and corners. To improve the flow accuracy around corners and in tight eddies, the tracers are advanced with a predictor–corrector numerical scheme. When one or more of the eight corners is located inside a building, boundary conditions are set to force the flow normal to the surface

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Yansen Wang, Cheryl L. Klipp, Dennis M. Garvey, David A. Ligon, Chatt C. Williamson, Sam S. Chang, Rob K. Newsom, and Ronald Calhoun

1. Introduction One of the characteristics of lower-troposphere winds over the Great Plains of the central United States is the low-level jet (LLJ). The LLJ is a thin stream of fast-moving air, usually more than 10 m s −1 , elevated about 200–500 m above the ground ( Hoecker 1963 ; Bonner 1968 ). The LLJ can appear in the daytime as a result of baroclinic forcing over sloping terrain ( Holton 1967 ) or because of the dynamical pressure differences caused by localized convection ( Bowen 1996

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Julia E. Flaherty, Brian Lamb, K. Jerry Allwine, and Eugene Allwine

Forecasting in the Urban Zone and Eighth Symp. on Integrated Observing and Assimilation Systems for Atmosphere, Oceans, and Land Surface, Seattle, WA, Amer. Meteor. Soc., J7.1 . Arnold , S. J. , and Coauthors , 2004 : Introduction to the DAPPLE air pollution project. Sci. Total Environ. , 332 , 139 – 153 . Barad , M. L. , 1958 : Project Prairie Grass: A field program in diffusion. Vols. I and II. Geophysics Res. Paper 59, AFCRC-TR-58-235, Air Force Cambridge Reseach Center, Bedford, MA, 439 pp

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