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Cheryl Klipp

variable within a half hour, that half-hour average is not used, where the variability is measured using the standard deviation of the three (six) average wind directions associated with the 10-min (5 min) flux estimates. If the standard deviation exceeds 30° for any half hour, the averages for that half hour are not used in the analysis. In addition to removing fixed fetch conditions, the wind direction variability criterion also removes much of the low–wind speed data, because high values of wind

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M. A. Nelson, E. R. Pardyjak, M. J. Brown, and J. C. Klewicki

and Oke 2002 ). High above the urban roughness in the inertial sublayer (ISL), where the turbulent fluxes are relatively constant, the flow mechanics are relatively straightforward and standard similarity theories generally apply; Roth (2000) provides a good review of several urban field studies that illustrate this. The complexity of the flow mechanics often increases in the canopy. Because the high three-dimensionality and spatial variability of the mean flow near urban surfaces, the study of

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