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• W1989882590 abstract "Use of simulation process models often combined with Earth Observation (EO) data, has played a key role in extending our abilities to study land surface interaction processes and enhancing our understanding of how different components of the Earth system interplay. Use of these synergistic techniques aims to improve the estimates of key parameters characterising land surface interactions by combining the horizontal coverage and spectral resolution of remote sensing data with the vertical coverage and fine temporal continuity of simulation process models.This study performs a Global Sensitivity Analysis (GSA) on the SimSphere land surface model aiming to further extend our understanding of the model structure and establish its coherence. It builds on previous works conducted on the model to which a sophisticated and cutting edge GSA meta-modelling method adopting Bayesian theory is implemented. Our first objective is to examine the effect of assuming uniform probability distribution function (PDFs) for the model inputs/outputs on the sensitivity of key quantities simulated by SimSphere. A further objective is to explore the sensitivity of new, previously unexplored variables simulated by the model, namely of the Daily Evaporative, Non-Evaporative Fractions and Radiometric Temperature.The GSA conducted assuming uniform PDFs showed comparable results to previous studies in terms of identifying the most sensitive model inputs to each of the outputs considered. Yet, in absolute terms, the statistical parameters measuring the sensitivity of the model inputs were notably different. SA on the newly examined model outputs showed largely explainable results and allowed identification of the most responsive model inputs and interactions. In general, our results provided further evidence supporting the model coherence and correspondence to the behaviour of a natural system. The implications of the main findings are discussed in the framework of the model use either as a stand-alone tool or synergistically with EO data, particularly so towards the operational development of such products. Assumption of different PDFs for model inputs/outputs has no major bearing on the SA results to the selected variables simulated by the model.Our results further extend our understanding of the structure and capability of SimSphere, the use of which is currently expanding worldwide.Results can be of key practical value in developing global operational products from EO data in methods using SimSphere." @default.
• W1989882590 created "2016-06-24" @default.
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• W1989882590 date "2013-11-01" @default.
• W1989882590 modified "2023-09-24" @default.
• W1989882590 title "A sensitivity analysis of the SimSphere SVAT model in the context of EO-based operational products development" @default.
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• W1989882590 doi "https://doi.org/10.1016/j.envsoft.2013.07.010" @default.
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