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

Quarterly Journal of the Royal Meteorological Society - Tập 137 Số 656 - Trang 553-597 - 2011
Dick Dee1, S. Uppala1, A. J. Simmons1, Paul Berrisford1, Paul Poli1, Shinya Kobayashi2, Ulf Andrae3, Magdalena Balmaseda1, Gianpaolo Balsamo1, Péter Bauer1, Peter Bechtold1, Anton Beljaars1, L. van de Berg4, Jean‐Raymond Bidlot1, Niels Bormann1, C. Delsol1, Rossana Dragani1, Manuel Fuentes1, Alan J. Geer1, L. Haimberger5, S. B. Healy1, Hans Hersbach1, Elías Hólm1, Lars Isaksen1, P. Kållberg3, Martin Köhler1, Marco Matricardi1, A. P. McNally1, Beatriz M. Monge-Sanz6, J.‐J. Morcrette1, Byoung-Kwon Park7, Carole Peubey1, Patricia de Rosnay1, Christina Tavolato5, Jean‐Noël Thépaut1, Frédéric Vitart1
1European Centre for Medium-Range Weather Forecasts, Reading, UK
2Japan Meteorological Agency, Tokyo, Japan
3Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
4European Organisation for the Exploitation of Meteorological Satellites, Darmstadt, Germany
5Department of Meteorology and Geophysics, University of Vienna, Austria
6School of Earth and Environment, University of Leeds, UK
7Korea Meteorological Administration, Seoul, Korea

Tóm tắt

AbstractERA‐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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