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DSS presents a comprehensive set of global, 3 hourly feedback
record reports used in the ECMWF 45-year reanalysis (ERA-40)
covering the period from September 1957 to August 2002. This data
set contains the full collection of observations, from many data
sources, which were assimilated into an ECMWF model and produced
ERA-40. The metadata generated during the ERA-40 quality
control/data assimilation (QC/DA) process were appended to the input
observations. The final combination of input observations and
feedback metadata are called feedback record reports. Feedback
record reports include a set of input observation variables,
analyzed variables, and associated metadata information. Input
variables include pressure, mean sea level pressure, three hour
pressure change, characteristic of pressure tendency, temperature,
dew point temperature, relative humidity, wind speed, and wind
direction. Analyzed variables are derived from input variables, and
were used in the model assimilation. These variables include
pressure, height, relative humidity, u- and v- wind speed
components. The feedback metadata available includes QC flags for
entire reports and individual variables, and differences between
individual variables and interpolated six-hour forecasts and final
model analyses. Further, in the case of QC report or variable
rejection, some details why rejection occurred are given in the
codes provided.
The ERA-Interim data from ECMWF is an update to the ERA-40 project.
The ERA-Interim data starts in 1989 and has a higher horizontal
resolution (T255, N128 nominally 0.703125 degrees) than the ERA-40
data (T159, N80 nominally 1.125 degrees). ERA-Interim is based on a
more current model than ERA-40 and uses 4DVAR (as opposed to 3DVAR
in ERA-40). ECMWF will continue to run the ERA-Interim model in near
real time through at least 2010, and possibly longer.
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