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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

( Taha 1999 ; Brown 2001 ; Martilli et al. 2002 ; Dupont et al. 2004 ). Observational data are a necessity for further improving urban parameterization schemes. Because of the difficulty of obtaining turbulence and wind observations at higher altitude over urban areas, there are, to our knowledge, no reported lidar observations on the LLJ interaction with the urban environment. The recent development of scanning Doppler lidar technologies enables us to observe this type of flow and its interaction

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Jerry Allwine and Marty Leach

) flows within and downwind of the tall-building core; 4) the surface energy balance within an urban area; 5) dispersion of tracer into, out of, and within buildings; and 6) dispersion of tracer throughout the downtown core and out to 4 km downwind from the release. The scientific elements of the study were accomplished using state-of-the-art meteorological and tracer instruments, including lidars, sodars, radars, sonic anemometers, airplane-based meteorological sensors, fast-response tracer analyzers

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