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S. B. Trier, F. Chen, K. W. Manning, M. A. LeMone, and C. A. Davis

aspect of the current work is the analysis of land surface effects on the PBL and precipitation over a period that is less than seasonal but includes the passage of multiple synoptic-scale weather systems. Much of the precipitation that occurs during a given warm season over the SGP can result from a few such periods, which signifies their importance. In this study we use coupled atmospheric–land surface models that explicitly simulate deep convection for an extended period, which constitutes an

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Roger M. Wakimoto and Hanne V. Murphey

resolution has only been attempted by Harrison et al. (2009) . Visual inspection of Figs. 4 and 5 suggests that the widths of the thin lines, based on radar reflectivity, are highly variable. This is also supported by the approximate “bell-shaped distributions” presented in Fig. 6a . In addition, there appears to be a seasonal dependence of the peak values of radar reflectivity. The echo profiles through the fine lines collected in May are greater than those plotted for the June cases. This would

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Margaret A. LeMone, Mukul Tewari, Fei Chen, Joseph G. Alfieri, and Dev Niyogi

air at constant pressure, c h is an eddy exchange coefficient, and U is the wind at the lowest atmospheric model level (i.e., 2 m). In (4) , we neglect the small correction (0.02 K) for the adiabatic lapse rate in T s − T 0 . Rewriting (2) and (3) in terms of H using (4) : and Finally, substituting (5) and (6) in (1b) , we obtain the following: The effects of horizontal variation of α and ε in (7) are small for the two land-cover classes represented, because their values

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