The ERA‐40 re‐analysis

Quarterly Journal of the Royal Meteorological Society - Tập 131 Số 612 - Trang 2961-3012 - 2005
S. Uppala1, P. Kållberg1, A. J. Simmons1, Ulf Andrae1, V. da Costa Bechtold1, Michael Fiorino2, J. K. Gibson1, Jan Haseler1, Andrés S. Rigual-Hernández1, Graeme Kelly1, X. Li3, Kazutoshi Onogi4, Sami Saarinen1, N. Sokka1, Richard P. Allan5,6, Erik Andersson1, K. Arpe7, Magdalena Balmaseda1, Anton Beljaars1, L. van de Berg8, Jean‐Raymond Bidlot1, Niels Bormann1, Sofía Caires9, Frédéric Chevallier1, A. Dethof1, M. Dragosavac1, Michael Fisher1, Manuel Fuentes1, Stefan Hagemann7, Elías Hólm1, Brian J. Hoskins10, Lars Isaksen1, Peter A. E. M. Janssen1, Roy L. Jenne11, A. P. McNally1, J.‐F. Mahfouf1, Jean‐Jacques Morcrette1, Nick A Rayner6, Roger Saunders6, P. Simon12, Andreas Sterl9, Kevin E. Trenberth11, A. Untch1, Drasko Vasiljevic1, Pedro Viterbo1, Jack Woollen13
1European Centre for Medium-Range Weather Forecasts, Reading, UK
2Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, USA
3Institute for Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
4Japan Meteorological Agency, Tokyo, Japan
5Environmental Systems Science Centre, University of Reading, UK
6Met Office, Exeter, UK
7Max-Planck-Institut für Meteorologie, Hamburg, Germany
8European Organisation for the Exploitation of Meteorological Satellites, Darmstadt, Germany
9Koninklijk Nederlands Meteorologisch Instituut, De Bilt, The Netherlands
10Department of Meteorology, University of Reading, UK
11National Center for Atmospheric Research, Boulder Colorado USA
12Météo-France, Toulouse
13NOAA/NWS/National Centers for Environmental Prediction, USA

Tóm tắt

AbstractERA‐40 is a re‐analysis of meteorological observations from September 1957 to August 2002 produced by the European Centre for Medium‐Range Weather Forecasts (ECMWF) in collaboration with many institutions. The observing system changed considerably over this re‐analysis period, with assimilable data provided by a succession of satellite‐borne instruments from the 1970s onwards, supplemented by increasing numbers of observations from aircraft, ocean‐buoys and other surface platforms, but with a declining number of radiosonde ascents since the late 1980s. The observations used in ERA‐40 were accumulated from many sources. The first part of this paper describes the data acquisition and the principal changes in data type and coverage over the period. It also describes the data assimilation system used for ERA‐40. This benefited from many of the changes introduced into operational forecasting since the mid‐1990s, when the systems used for the 15‐year ECMWF re‐analysis (ERA‐15) and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) re‐analysis were implemented. Several of the improvements are discussed. General aspects of the production of the analyses are also summarized.A number of results indicative of the overall performance of the data assimilation system, and implicitly of the observing system, are presented and discussed. The comparison of background (short‐range) forecasts and analyses with observations, the consistency of the global mass budget, the magnitude of differences between analysis and background fields and the accuracy of medium‐range forecasts run from the ERA‐40 analyses are illustrated. Several results demonstrate the marked improvement that was made to the observing system for the southern hemisphere in the 1970s, particularly towards the end of the decade. In contrast, the synoptic quality of the analysis for the northern hemisphere is sufficient to provide forecasts that remain skilful well into the medium range for all years. Two particular problems are also examined: excessive precipitation over tropical oceans and a too strong Brewer‐Dobson circulation, both of which are pronounced in later years. Several other aspects of the quality of the re‐analyses revealed by monitoring and validation studies are summarized. Expectations that the ‘second‐generation’ ERA‐40 re‐analysis would provide products that are better than those from the firstgeneration ERA‐15 and NCEP/NCAR re‐analyses are found to have been met in most cases. © Royal Meteorological Society, 2005. The contributions of N. A. Rayner and R. W. Saunders are Crown copyright.

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Quarterly Journal of the Royal Meteorological Society

Tập 131 Số 612

2961-3012

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