660 Influence of Boundary Layer Height Parameterization of 2-D Footprint Models for Short Flux Towers

Tuesday, 24 January 2017
4E (Washington State Convention Center )
Alexandria Gartside McCombs, University of South Carolina, Columbia, SC; and A. L. Hiscox

In the absence of boundary layer height measurements, the height of the boundary layer has to be calculated using computationally heavy equations that have significant uncertainty. Boundary Layer height is a crucial parameter for footprint models. Therefore uncertainty in the BL height can cause uncertainty in footprint computations.  This is particularly true for tall flux towers that are placed well into the turbulent boundary layer. This work seeks to assess the influence of the boundary layer height on a single footprint using the model developed by Kljun et al. (2015). A sensitivity of height input will be presented. The results indicate there is little need to conduct computationally heavy boundary layer height values when the measurement height of the flux tower is less than 10m, and a constant value provides little variation in the 2-D footprint output.
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