The Bulk Transfer Coefficients over a Vegetated Surface Based on K-theory and a 2nd-Order Closure Model

Abstract

A comparison is performed between K-theory and a 2nd-order closure model for the calculated profiles and fluxes within and above a vegetation canopy. Also, the relationship between the bulk transfer coefficients and individual leaf transfer coefficients is presented on the basis of K-theory and the closure model. Well-known differences are detected in the shape of the calculated profiles within the lower canopy layer. However, the differences are not serious in the calculated fluxes above the canopy, resulting in small differences in the values of the bulk transfer coefficients. With the computational simplicity, the results support the use of K-theory as being adequate enough in the prediction of the surface fluxes by a simple model.