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Land surface albedo, the fraction of incoming solar radiation reflected bythe land surface, is a key component of the Earth system. This studyevaluates snow-free surface albedo simulations by the Community AtmosphereBiosphere Land Exchange (CABLEv1.4b) model with the Moderate ResolutionImaging Spectroradiometer (MODIS) and the Satellite Pour L'Observation de laTerre (SPOT) albedo. We compare results from offline simulations over theAustralian continent. The control simulation has prescribed backgroundsnow-free and vegetation-free soil albedo derived from MODIS whilst theexperiments use a simple parameterisation based on soil moisture and colour,originally from the Biosphere Atmosphere Transfer Scheme (BATS), and adoptedin the Common Land Model (CLM). The control simulation, with prescribedsoil albedo, shows that CABLE simulates overall albedo over Australiareasonably well, with differences compared to MODIS and SPOT albedos within±0.1. Application of the original BATS scheme, which uses an eight-class soilclassification, resulted in large differences of up to −0.25 for the near-infrared (NIR) albedo over large parts of the desert regions of centralAustralia. The use of a recalibrated 20-class soil colour classification fromthe CLM, which includes a higher range for saturated and VIS (visible) and NIR soilalbedos, reduced the underestimation of the NIR albedo. However, this soilcolour mapping is tuned to CLM soil moisture, a quantity which is notnecessarily transferrable between land surface models. We thereforerecalibrated the soil color map using CABLE's climatological soil moisture, which furtherreduced the underestimation of the NIR albedo to within ±0.15 over mostof the continent as compared to MODIS and SPOT albedos. Small areas of largerdifferences of up to −0.25 remained within the central arid parts of thecontinent during summer; however, the spatial extent of these largedifferences is substantially reduced as compared to the simulation using thedefault eight-class uncalibrated soil colour map. It is now possible to useCABLE coupled to atmospheric models to investigate soil-moisture–albedofeedbacks, an important enhancement of the model

Implementation of a soil albedo scheme in the CABLEv1.4b land surface model and evaluation against MODIS estimates over Australia