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Integrating multiple satellite observations into a coherent dataset to monitor the full water cycle -Application to the Mediterranean region

Abstract : The Mediterranean region is one of the more complex environments and is a hot-spot for climate change. The HyMeX (Hydrometeorological Mediterranean eXperiment) aims at improving our understanding of the water cycle at the meteorological to the inter-annual scales. However, monitoring this water cycle with Earth Observations (EO) is still a true challenge: EO products are multiple, and their use still suffer from large uncertainties and incoherencies among the products. Over the Mediterranean region, these difficulties are exacerbated by the coastal/mountainous regions and 5 the small size of the hydrological basins. Therefore, merging/integration techniques have been developed to solve these issues. We introduce here an improved methodology that closes not only the terrestrial but also the atmospheric and ocean budgets. The new scheme allows to impose a spatial and temporal multi-scaling budget closure constraint. A new approach is also proposed to downscale the results from the basin to the pixel scales. The provided Mediterranean WC budget is for the first time based mostly on observations such as GRACE water storage or the netflow at the Gibraltar 10 strait. The integrated dataset is in better agreement with in situ measurements, and we are now able to estimate the Bosporus strait annual mean netflow.
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Submitted on : Friday, November 22, 2019 - 7:58:51 PM
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Victor Pellet, Filipe Aires, Simon Munier, Gabriel Jordà, Diego Prieto, et al.. Integrating multiple satellite observations into a coherent dataset to monitor the full water cycle -Application to the Mediterranean region. Hydrology and Earth System Sciences, European Geosciences Union, 2019, 23 (1), pp.465-491. ⟨10.5194/hess-23-465-2019⟩. ⟨hal-02377009⟩

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