Aggregation of Surface Heat Balance by Means of the Linear Model

II:Aggregation of Surface Heat Fluxes over an Heterogeneous Region

Abstract

This research studys the aggregation of surface heat balance by means of the linear model, and discusses the derivation of an equation of regionally averaged surface heat fluxes and their aggregation criteria. We discuss aggregation of surface heat fluxes over an inhomogeneous region in this paper which is the second part in the two parts, and the following conclusions are obtained; (i)statistical distribution of bulk coefficients in the same land covers can be aggregated by the parameter mean method, (ii)that of evaporation efficiency there can be aggregated for some statistical distributions, not by means of the parameter mean method but the moment method, (iii)the moment method can aggregate the surface heat balance even over an inhomogeneous region with high accuracy, (iv)the dominant land cover method used as the aggregation method in the land process model of many atmospheric models, is not good for the aggregation procedure. (v)the parameter mean method is easy to be implemented in the conventional model, but is not accurate, while the moment method is not easy from the view point of usage but accuracy is good.