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| Titel |
Verification of the new ECMWF ERA-Interim reanalysis over France |
| VerfasserIn |
C. Szczypta, J.-C. Calvet, C. Albergel, G. Balsamo, S. Boussetta, D. Carrer, S. Lafont, C. Meurey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 2 ; Nr. 15, no. 2 (2011-02-25), S.647-666 |
| Datensatznummer |
250012651
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| Publikation (Nr.) |
 copernicus.org/hess-15-647-2011.pdf |
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| Zusammenfassung |
| An evaluation of the global ECMWF atmospheric reanalysis ERA-Interim (with a
0.5° grid) is performed over France, based on the high resolution (8 km)
SAFRAN atmospheric reanalysis. The ERA-Interim precipitation, Incoming Solar
Radiation (ISR), air temperature, air humidity, and wind speed, are compared
with their SAFRAN counterparts. Also, interpolated in situ ISR observations
are used in order to consolidate the evaluation of this variable. The daily
precipitation estimates produced by ERA-Interim over France correlate very
well with SAFRAN. However, the values are underestimated by 27%. A
GPCP-corrected version of ERA-Interim is less biased (13%). The
ERA-Interim estimates of ISR correlate very well with SAFRAN and with in
situ observations on a daily basis. Whereas SAFRAN underestimates the ISR by
6 Wm−2, ERA-Interim overestimates the ISR by 10 Wm−2. In order to
assess the impact of the ERA-Interim errors, simulations of the ISBA-A-gs
land surface model are performed over the SMOSREX grassland site in
southwestern France using ERA-Interim (with and without GPCP rescaling) and
SAFRAN. Latent and sensible heat fluxes are simulated, together with carbon
dioxide fluxes. The rescaled ERA-Interim performs better than the original
ERA-Interim and permits to achieve flux scores similar to those obtained
with SAFRAN. |
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