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Dataset: ei.moda.an.sfc.regn128sc.1986100100
Catalog: THREDDS Server Default Catalog : You must change this to fit your server!/d627001 ERA-Interim Project, Monthly Means/d627001 Aggregations/Analysis/Monthly Mean ERA Interim atmospheric model analysis for surface
dataFormatGRIB-1
authorityedu.ucar.rda
featureTypeGRID
dataSize12837600
idaggregations/g/d627001/9/files/ei.moda.an.sfc.regn128sc.1986100100
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Documentation
Keywords
Dates
Creators
Publishers
Geospatial Coverage
Time Coverage
Properties

Description:

  • Rights: Freely Available
  • summary: ERA-Interim represents a major undertaking by ECMWF (European Centre for Medium-Range Weather Forecasts) to produce a reanalysis with an improved atmospheric model and assimilation system which replaces those used in ERA-40, particularly for the data-rich 1990s and 2000s, and to be continued as an ECMWF Climate Data Assimilation System (ECDAS) until superseded by a new extended reanalysis. Preliminary runs indicated that several of the inaccuracies exhibited by ERA-40 such as too-strong precipitation over oceans from the early 1990s onwards and a too-strong Brewer-Dobson circulation in the stratosphere, were eliminated or significantly reduced. Production of ERA-Interim, from 1989 onwards, began in summer of 2006. (The period 1979-1988 was prepended in 2011.) Through systematic increases of computing power, 4-dimensional variational assimilation (4D-Var) became feasible and part of ECMWF operations since 1997, paving the way to base ERA-Interim on 4D-Var (rather than 3D-Var as in ERA-40). Enhanced computing power also allowed horizontal resolution to be increased from T159 (N80, nominally 1.125 degrees for ERA-40) to T255 (N128, nominally 0.703125 degrees), and the latest cycle of the atmospheric model (IFS CY31r1 and CY31r2) to be used, taking advantage of improved model physics. ERA-interim retains the same 60 model levels used for ERA-40 with the highest level being 0.1 hectopascal. In addition, data assimilation of ERA-Interim also benefits from quality control that draws on experience from ERA-40 and JRA-25, variational bias correction of satellite radiance data, and more extensive use of radiances with an improved fast radiative transfer model.
  • summary: Through systematic increases of computing power, 4-dimensional variational assimilation (4D-Var) became feasible and part of ECMWF operations since 1997, paving the way to base ERA-Interim on 4D-Var (rather than 3D-Var as in ERA-40). Enhanced computing power also allowed horizontal resolution to be increased from T159 (N80, nominally 1.125 degrees for ERA-40) to T255 (N128, nominally 0.703125 degrees), and the latest cycle of the atmospheric model (IFS CY31r1 and CY31r2) to be used, taking advantage of improved model physics. ERA-interim retains the same 60 model levels used for ERA-40 with the highest level being 0.1 hectopascal. In addition, data assimilation of ERA-Interim also benefits from quality control that draws on experience from ERA-40 and JRA-25, variational bias correction of satellite radiance data, and more extensive use of radiances with an improved fast radiative transfer model.
  • summary: ERA-Interim uses sets of observations and boundary forcing fields acquired for ERA-40 through 2001, and from ECMWF operations thereafter. Noteworthy exceptions include new ERS (European Remote Sensing Satellite) altimeter wave heights, EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites) reprocessed winds and clear-sky radiances, GOME (Global Ozone Monitoring Experiment) ozone data from the Rutherford Appleton Laboratory, and CHAMP (CHAllenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment), and COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) GPS radio occultation measurements processed and archived by UCAR (University Corporation for Atmospheric Research).
  • summary: NCAR's Data Support Section (DSS) is performing and supplying a grid transformed version of ERA-Interim, in which variables originally represented as spectral coefficients or archived on a reduced Gaussian grid are transformed to a regular 512 longitude by 256 latitude N128 Gaussian grid. In addition, DSS is also computing horizontal winds (u-component, v-component) from spectral vorticity and divergence where these are available. Processing of analysis groups and the surface forecast has been completed for January 1979 through April 2014 (inclusive), or at least 35 years, and will continue as ERA-Interim becomes available thereafter (please refer to the 'Period details by subset' tab immediately below for the time range currently available for each group). Data is currently available via NCAR's High Performance Storage System (HPSS), or by delayed mode request which transfers files from the HPSS to our web server for internet download, or via direct internet download, or NCAR's GLADE file system.
  • ERA-Interim Project, Monthly Means
  • ECMWF Downloadable Datasets
  • Description of ERA-Interim at the NCAR Climate Data Guide

Keywords:

  • : Numerical Weather Prediction
  • : Model data
  • : Reanalysis

Dates:

  • modified : 2012-02-08T17:29:45Z

Creators:

Publishers:

GeospatialCoverage:

  • Longitude: 0.0 to 359.2970272898674 Resolution=0.7031252980232239 degrees_east
  • Latitude: -89.46282196044922 to 89.46282196044922 Resolution=0.7016706466674805 degrees_north

TimeCoverage:

  • Start: 1979-02-01T00:00:00Z
  • End: 2019-09-01T00:00:00Z
  • Duration: 40.581 years

Properties:

  • Originating_or_generating_Center = European Centre for Medium Range Weather Forecasts (ECMWF) (RSMC)
  • Originating_or_generating_Subcenter = 0
  • GRIB_table_version = 0,128
  • file_format = GRIB-1
  • Conventions = CF-1.6
  • history = Read using CDM IOSP GribCollection v3
  • featureType = GRID
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