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Title:
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An advanced method based on surface renewal theory to estimate the friction velocity and the surface heat flux
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Author:
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Castellví Sentís, Francesc
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Notes:
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The earlier formulation based on surface renewal (SR) analysis for estimating the sensible (or
buoyant) heat flux (H) of a surface without requiring calibration involved canopy parameters to
simultaneously estimate H and the friction velocity (u*). A SR-based formulation is derived that allows
estimating u* and subsequently H that, at most, involves the zero-plane displacement. Regardless of the
measurement height above the canopy and the stability case, u* and H estimates were closed to values
measured using the eddy covariance method for either homogeneous or sparse (orchards) canopies. The
proposed SR analysis can be potentially considered for gap filling in half-hourly eddy covariance series of u*
and H and to estimate parameters useful for land surface modeling, such as the roughness length for
momentum, the roughness lengths for momentum, and heat and the turbulent Prandtl number.
The author gratefully acknowledges R. L Snyder (retired extensionist at LAWR department, UC Davis) and the late A. Martínez‐Cob (1960‐2014, researcher at Aula Dei, Zaragoza, Spain) who provided all the data used in this work. This work was supported under project CGL2015‐65627‐C3‐1‐R (AEI/FEDER, UE) Ministerio de Economía y Competitividad of Spain. Data sets are available at the repository of the University of Lleida, http://hdl.handle.net/10459.1/64583. |
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Subject(s):
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-Mètode de renovació de partícules d'aire en superfície
-Mètode de covariança de remolins
-Flux de calor sensible
-Velocitat de fricció |
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Rights:
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(c) American Geophysical Union, 2018
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Document type:
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Article
Article - Published version |
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Published by:
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American Geophysical Union
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