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The correction of soil heat flux measurements to derive an accurate surface energy balance by the Bowen ratio method


, : The correction of soil heat flux measurements to derive an accurate surface energy balance by the Bowen ratio method. Journal of Hydrology 188-189(1-4): 453-465

A method is presented for calculating conductive heat flux at the soil surface (G (sub 0) ) from measured soil heat flux (G) some centimetres beneath the ground surface. The method does not require estimation of thermal properties and is valid for inhomogeneous soils with regard to their thermal properties. Data from the central sub-site of the Eastern Super Site of the HAPEX-Sahel experiment are used to illustrate the method. Finally, the influence of using corrected values of surface soil heat flux G (sub 0) , rather than measured values of G, in the energy budget with the Bowen ratio is evaluated. The corrections for G are small in the case of the highly diffusive soil of the Sahel. Errors in estimating latent heat flux with G instead of G (sub 0) are negligible. However, calculations show that these errors could be much more important for other soils with lower soil thermal diffusivity.

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Accession: 002980966

DOI: 10.1016/s0022-1694(96)03187-3

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