High resolution land surface fluxes from satellite data (HOLAPS v1.0) High resolution land surface fluxes from satellite data (HOLAPS v1.0): evaluation and uncertainty assessment High resolution land surface fluxes from satellite data (HOLAPS v1.0)

Abstract

Surface water and energy fluxes are essential components of the Earth system. Sur-face latent heat fluxes provide major energy input to the atmosphere. Despite the im-portance of these fluxes, state-of-the-art datasets of surface energy and water fluxes largely differ. The present paper introduces a new framework for the estimation of sur-5 face energy and water fluxes at the land surface, which allows for temporally and spatially high resolved flux estimates at the global scale (HOLAPS). The framework maximizes the usage of existing long-term satellite data records and ensures inter-nally consistent estimates of the surface radiation and water fluxes. The manuscript introduces the technical details of the developed framework and provides results of a 10 comprehensive sensitivity and evaluation study. Overall the results indicate very good agreement with in situ observations when compared against 49 FLUXNET stations worldwide. Largest uncertainties of latent heat flux and net radiation were found to result from uncertainties in the global solar radiation flux obtained from satellite data products.