J6.3 Impacts of Differing Aerodynamic Resistance Formulae on Modeled Energy Exchange at the Above-Canopy/Within-Canopy/Soil Interface

Wednesday, 22 June 2016: 10:30 AM
The Canyons (Sheraton Salt Lake City Hotel)
William P. Kustas, USDA-ARS, Beltsville, MD; and H. Nieto, A. Andreu, D. Kool, N. Agam, and J. G. Alfieri

Application of the Two-Source Energy Balance (TSEB) Model using land surface temperature (LST) requires aerodynamic resistance parameterizations for the flux exchange above the canopy layer, within the canopy air space and at the soil/substrate surface. There are a number of aerodynamic resistance formulations that can be used, based on K-theory or Lagrangian approaches while others are semi-empirical derived from experimental data. These formulations require a within-canopy wind profile model such as the one derived by Massman. The effect of the various parameterization schemes on TSEB output over both highly-structured agro-ecosystems, such as orchards and vineyards, and strongly clumped natural landscapes, such as woody savanna and desert shrublands will be presented. The utility of the various aerodynamic resistance formulae for application over these types of canopy architectures will also be discussed along with ongoing efforts to develop enhanced approaches for strongly-clumped and open-canopy environments.
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