Volume 137, Issue 656 p. 553-597
Review Article

The ERA-Interim reanalysis: configuration and performance of the data assimilation system

D. P. Dee

Corresponding Author

D. P. Dee

European Centre for Medium-Range Weather Forecasts, Reading, UK

ECMWF, Shinfield Park, Reading RG2 9AX, UK.Search for more papers by this author
S. M. Uppala

S. M. Uppala

European Centre for Medium-Range Weather Forecasts, Reading, UK

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A. J. Simmons

A. J. Simmons

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. Berrisford

P. Berrisford

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. Poli

P. Poli

European Centre for Medium-Range Weather Forecasts, Reading, UK

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S. Kobayashi

S. Kobayashi

Japan Meteorological Agency, Tokyo, Japan

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U. Andrae

U. Andrae

Swedish Meteorological and Hydrological Institute, Norrköping, Sweden

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M. A. Balmaseda

M. A. Balmaseda

European Centre for Medium-Range Weather Forecasts, Reading, UK

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G. Balsamo

G. Balsamo

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. Bauer

P. Bauer

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. Bechtold

P. Bechtold

European Centre for Medium-Range Weather Forecasts, Reading, UK

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A. C. M. Beljaars

A. C. M. Beljaars

European Centre for Medium-Range Weather Forecasts, Reading, UK

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L. van de Berg

L. van de Berg

European Organisation for the Exploitation of Meteorological Satellites, Darmstadt, Germany

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J. Bidlot

J. Bidlot

European Centre for Medium-Range Weather Forecasts, Reading, UK

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N. Bormann

N. Bormann

European Centre for Medium-Range Weather Forecasts, Reading, UK

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C. Delsol

C. Delsol

European Centre for Medium-Range Weather Forecasts, Reading, UK

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R. Dragani

R. Dragani

European Centre for Medium-Range Weather Forecasts, Reading, UK

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M. Fuentes

M. Fuentes

European Centre for Medium-Range Weather Forecasts, Reading, UK

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A. J. Geer

A. J. Geer

European Centre for Medium-Range Weather Forecasts, Reading, UK

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L. Haimberger

L. Haimberger

Department of Meteorology and Geophysics, University of Vienna, Austria

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S. B. Healy

S. B. Healy

European Centre for Medium-Range Weather Forecasts, Reading, UK

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H. Hersbach

H. Hersbach

European Centre for Medium-Range Weather Forecasts, Reading, UK

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E. V. Hólm

E. V. Hólm

European Centre for Medium-Range Weather Forecasts, Reading, UK

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L. Isaksen

L. Isaksen

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. Kållberg

P. Kållberg

Swedish Meteorological and Hydrological Institute, Norrköping, Sweden

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M. Köhler

M. Köhler

European Centre for Medium-Range Weather Forecasts, Reading, UK

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M. Matricardi

M. Matricardi

European Centre for Medium-Range Weather Forecasts, Reading, UK

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A. P. McNally

A. P. McNally

European Centre for Medium-Range Weather Forecasts, Reading, UK

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B. M. Monge-Sanz

B. M. Monge-Sanz

School of Earth and Environment, University of Leeds, UK

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J.-J. Morcrette

J.-J. Morcrette

European Centre for Medium-Range Weather Forecasts, Reading, UK

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B.-K. Park

B.-K. Park

Korea Meteorological Administration, Seoul, Korea

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C. Peubey

C. Peubey

European Centre for Medium-Range Weather Forecasts, Reading, UK

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P. de Rosnay

P. de Rosnay

European Centre for Medium-Range Weather Forecasts, Reading, UK

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C. Tavolato

C. Tavolato

Department of Meteorology and Geophysics, University of Vienna, Austria

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J.-N. Thépaut

J.-N. Thépaut

European Centre for Medium-Range Weather Forecasts, Reading, UK

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F. Vitart

F. Vitart

European Centre for Medium-Range Weather Forecasts, Reading, UK

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First published: 28 April 2011
Citations: 7

Abstract

ERA-Interim is the latest global atmospheric reanalysis produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). The ERA-Interim project was conducted in part to prepare for a new atmospheric reanalysis to replace ERA-40, which will extend back to the early part of the twentieth century. This article describes the forecast model, data assimilation method, and input datasets used to produce ERA-Interim, and discusses the performance of the system. Special emphasis is placed on various difficulties encountered in the production of ERA-40, including the representation of the hydrological cycle, the quality of the stratospheric circulation, and the consistency in time of the reanalysed fields. We provide evidence for substantial improvements in each of these aspects. We also identify areas where further work is needed and describe opportunities and objectives for future reanalysis projects at ECMWF. Copyright © 2011 Royal Meteorological Society

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