ECMWF has provided global atmospheric analyses from its archive for
many years. The ERA-15 project was devised in response to wishes expressed
by many users for a data set generated by a modern, consistent, and invariant
data assimilation system.
The project began in February 1993, and a re-analysis for the period
December 1978 through February 1994 was completed in September 1996. The
data assimilation system, once defined, remained virtually constant throughout
ERA has received assistance from the ECMWF Council, the European
Community, the University of California, the Japan Meteorologcial Agency
(JMA), the European Union (EU), the World Climate Research Project (WCRP),
Cray Research Incorporated, and the Center for Ocean-Land-Atmosphere Studies
(COLA). In addition data and co-operation have been forthcoming from many
quarters, including ECMWF Member States, the University of Innsbruck,
the National Ocean and Atmospheric Administration (NOAA) and National
Center for Atmospheric Research (NCAR) in the United States of America,
and the Australian Bureau of Meteorology (BoM).
Table of Contents
- Selection of a "best possible" assimilation
system for reanalysis.
- The ECMWF Reanalysis Data Assimilation
- ERA Production
- Observation Monitoring
- Radiosonde Height Biases
- TOVS Quality Control and Bias Tuning
- Monitoring of Analysis Quality
- Observing System Characteristics
- Some General Circulation Features
in ERA. Comparisons with ECMWF Operational Analyses.
- ERA forecasts
- Data for Research