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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2018-117
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
ERA-5 and ERA-Interim driven ISBA land surface model simulations: Which one performs better?
Clement Albergel1, Emanuel Dutra2, Simon Munier1, Jean-Christophe Calvet1, Joaquin Munoz-Sabater3, Patricia de Rosnay3, and Gianpaolo Balsamo3 1CNRM UMR 3589, Météo-France/CNRS, Toulouse, France
2Instituto Dom Luiz, IDL, Faculty of Sciences, University of Lisbon, Portugal
3ECMWF, Reading, UK
Abstract. The European Centre for Medium Range Weather Forecast (ECMWF) recently released a first 7-year segment of its latest atmospheric reanalysis: ERA-5 over 2010–2016. ERA-5 important changes relative to ERA-Interim former atmospheric reanalysis include a higher spatial and temporal resolution as well as a more recent model and data assimilation system. ERA-5 is foreseen to replace ERA-Interim reanalysis and one of the main goals of this study is to assess whether ERA5 can enhance the simulation performances with respect to ERA-Interim when it is used to force a Land-Surface-Model (LSM). To that end, both ERA-5 and ERA-Interim are used to force the ISBA (Interactions between Soil, Biosphere, and Atmosphere) LSM fully coupled with the Total Runoff Integrating Pathways (TRIP) scheme adapted for the CNRM (Centre National de Recherches Météorologiques) continental hydrological system within the SURFEX (SURFace Externalisée) modelling platform of Météo-France. Simulations cover the 2010–2016 period at half a degree spatial resolution.

ERA-5 impact on the ISBA LSM with respect to ERA-Interim is assessed over a data-rich area: North America. A comprehensive evaluation of ERA-5 impact is conducted using remote sensing and in-situ observations covering a substantial part of the land surface storage and fluxes. The remote sensing observations include: (i) satellite-driven model estimates of land evapotranspiration, (ii) upscaled ground-based observations of gross primary productivity, (iii) satellite derived estimates of surface soil moisture as well as (iv) satellite derived estimates of Leaf Area Index. The in-situ observations cover (i) soil moisture, (ii) turbulent heat fluxes and Net Ecosystem Exchange (NEE), (iii) river discharges and (iv) snow depth. ERA-5 leads to a consistent improvement over ERA-Interim as verified with the use of these 8 independent observations of different land status and of the model simulations forced by ERA-5 when compared with ERAInterim.. This is particularly evident for the land surface variables linked to the terrestrial hydrological cycle while variables linked to vegetation are less impacted. Results also indicate that while precipitation provides, to a large extend, improvements in surface fields (e.g. large improvement in the representation of river discharge and snow depth), the other atmospheric variables play an important role, contributing to the overall improvements. These results highlight the importance of enhanced meteorological forcing quality provided by the new ERA-5 reanalysis, which will pave the way for a new generation of land-surface developments and applications.

Citation: Albergel, C., Dutra, E., Munier, S., Calvet, J.-C., Munoz-Sabater, J., de Rosnay, P., and Balsamo, G.: ERA-5 and ERA-Interim driven ISBA land surface model simulations: Which one performs better?, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2018-117, in review, 2018.
Clement Albergel et al.
Clement Albergel et al.
Clement Albergel et al.

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Short summary
ECMWF released a first 7-year segment of its latest atmospheric reanalysis: ERA-5 over 2010–2016. ERA-5 is foreseen to replace ERA-Interim reanalysis and one of the main goals of this study is to assess whether ERA-5 can enhance the simulation performances with respect to ERA-Interim when it is used to force the ISBA (Interactions between Soil, Biosphere, and Atmosphere) Land-Surface-Model. A comprehensive evaluation of ERA-5 impact is conducted using remote sensing and in-situ observations.
ECMWF released a first 7-year segment of its latest atmospheric reanalysis: ERA-5 over...
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