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Poster communications

New estimates of variations in atmospheric-terrestrial flux of water over Europe, based on regional reanalysis and multi-sensor observations

Abstract : Precipitation minus evapotranspiration, the flux of water between the atmosphere and the Earth’s surface, provides important information regarding the interaction of the atmosphere with the land surface. It links atmospheric and terrestrial water budgets and, thus, realizes an important boundary condition for both climate modeling and hydrological studies. Yet, due to a general lack of unbiased measurements, the atmospheric-terrestrial flux of water is poorly constrained by direct observations and rather, usually, reconstructed from data-assimilating atmospheric reanalyses. Via the terrestrial water budget equation, water storage derived from products of the Gravity Recovery and Climate Experiment (GRACE) mission combined with runoff data, can be used to assess the realism of atmospheric-terrestrial flux of water in atmospheric models. A number of studies have applied this method to global reanalysis products, with good results only for large river basins. In this study, we first assess the closure of the terrestrial water budget over a number of European river basins from the new release 5 GRACE products, after careful postprocessing and in combination with GRDC and BfG discharge data, and from precipitation minus evapotranspiration obtained from the operational analysis of the regional high-resolution NWP models COSMO-DE and -EU, a new COSMO-based reanalysis for the European CORDEX domain, the global reanalyses ERA-INTERIM and MERRA, as well as few observation-based data sets (E-OBS, GPCC, upscaled FLUXNET observations from Jung et al., 2010). This allows us to identify biases of up to 20 mm/month in the different data products, at different spatial scales down to the Oder catchment (110.000 km2). Among the atmospheric (re-) analyses, we find COSMO-EU atmosphere-terrestrial flux of water almost unbiased over Central Europe. Finally, we assess bias-corrected flux and reconstructed multi-sensor water storage variations.
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Poster communications
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https://hal-insu.archives-ouvertes.fr/insu-01119805
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, February 24, 2015 - 10:00:51 AM
Last modification on : Friday, April 5, 2019 - 8:17:37 PM

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  • HAL Id : insu-01119805, version 1

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A. Springer, K. Hartung, Jürgen Kusche, Christian Ohlwein, Laurent Longuevergne. New estimates of variations in atmospheric-terrestrial flux of water over Europe, based on regional reanalysis and multi-sensor observations. AGU Fall Meeting 2013, Dec 2013, San Francisco, United States. pp.H51E-1245, 2013. ⟨insu-01119805⟩

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