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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

from 0° to 15° elevation angles and it took only 6 s to complete each scan. The sonic anemometer data from ARL tower 1 (suburban) and tower 5 (urban) were chosen to analyze the turbulence near the surface in what has been called the roughness sublayer ( Roth 2000 ). Both towers had two R. M. Young sonic anemometers (model 81000) at 5- and 10-m heights. The sonic anemometer data were quality controlled using a package developed by Vickers and Mahrt (1997) . a. The mean atmospheric conditions Figure

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

1. Introduction Atmospheric transport and dispersion field campaigns have been vital in the development and evaluation of air-quality and emergency-response models. Early experiments, such as Project Prairie Grass ( Barad 1958 ) and the Wangara Experiment ( Clarke et al. 1971 ), were fundamental to the study of plume dispersion. High-quality datasets such as those produced from these principal experiments continue to be referenced as a source of analysis and validation data. Some examples

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

City, Oklahoma (OKC; Allwine et al. 2004 ). The objective of the experiment was the collection of meteorological and tracer data resolving atmospheric dispersion at scales of motion including (a) flows around a single city block, (b) flows in and around several blocks in the downtown central business district (CBD), and (c) flows into the suburban Oklahoma City area several kilometers from the CBD. A quality-controlled dataset would be used to evaluate and improve a suite of indoor and outdoor

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Stevens T. Chan and Martin J. Leach

2001 ), and vegetative canopies ( Chan et al. 2002 ). Predictions from our model are continuously being verified against measured data from wind-tunnel and field studies. Some of the model evaluation studies using wind-tunnel data were reported in Chan and Stevens (2000) and Chan et al. (2001) . Examples of model evaluations using observed data from various field experiments were documented in Calhoun et al. (2004 , 2005 ), Chan et al. (2003) , Lee et al. (2002) , and Humphreys et al. (2003

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