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Dataset: Best JRA-55 3-Hourly 1.25 Degree Land Surface Forecast Fields Time Series
Catalog: d628000 Japanese 55-year Reanalysis, Daily 3-Hourly and 6-Hourly Data/d628000 NCAR RDA - JRA-55: Japanese 55-year Reanalysis, Daily 3-Hourly and 6-Hourly Data/d628000 Aggregations/Forecast Fields/JRA-55 3-Hourly 1.25 Degree Land Surface Forecast Fields
dataFormatGRIB-1
authorityedu.ucar.rda
featureTypeGRID
idaggregations/g/d628000/17/Best
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Documentation
Keywords
Creators
Publishers
Geospatial Coverage
Time Coverage
Properties

Description:

  • summary: Single time dimension: for each forecast time, use GRIB record with smallest offset from reference time
  • Rights: Freely Available
  • summary: The Japan Meteorological Agency (JMA) conducted JRA-55, the second Japanese global atmospheric reanalysis project. It covers 55 years, extending back to 1958, coinciding with the establishment of the global radiosonde observing system. Compared to its predecessor, JRA-25, JRA-55 is based on a new data assimilation and prediction system (DA) that improves many deficiencies found in the first Japanese reanalysis. These improvements have come about by implementing higher spatial resolution (TL319L60), a new radiation scheme, four-dimensional variational data assimilation (4D-Var) with Variational Bias Correction (VarBC) for satellite radiances, and introduction of greenhouse gases with time varying concentrations. The entire JRA-55 production was completed in 2013, and thereafter will be continued on a real time basis.
  • summary: Specific early results of quality assessment of JRA-55 indicate that a large temperature bias in the lower stratosphere has been significantly reduced compared to JRA-25 through a combination of the new radiation scheme and application of VarBC (which also reduces unrealistic temperature variations). In addition, a dry land surface anomaly in the Amazon basin has been mitigated, and overall forecast scores are much improved over JRA-25.
  • summary: Most of the observational data employed in JRA-55 are those used in JRA-25. Additionally, newly reprocessed METEOSAT and GMS data were supplied by EUMETSAT and MSC/JMA respectively. Snow depth data over the United States, Russia and Mongolia were supplied by UCAR, RIHMI and IMH respectively.
  • summary: The Data Support Section (DSS) at NCAR has processed the 1.25 degree version of JRA-55 with the RDA (Research Data Archive) archiving and metadata system. The model resolution data has also been acquired, archived and processed as well, including transformation of the TL319L60 grid to a regular latitude-longitude Gaussian grid (320 latitudes by 640 longitudes, nominally 0.5625 degree). All RDA JRA-55 data is available for internet download, including complete subsetting and data format conversion services.
  • JRA-55: Japanese 55-year Reanalysis, Daily 3-Hourly and 6-Hourly Data
  • JRA-55: Japanese 55-year Reanalysis
  • Description of JRA-55 at the NCAR Climate Data Guide

Keywords:

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

Creators:

Publishers:

GeospatialCoverage:

  • Longitude: 0.0 to 358.75 Resolution=1.25 degrees_east
  • Latitude: -90.0 to 90.0 Resolution=1.25 degrees_north

TimeCoverage:

  • Start: 1957-12-31T21:00:00Z
  • End: 2024-02-01T00:00:00Z
  • Duration: 66.085 years

Properties:

  • Originating_or_generating_Center = Tokyo (RSMC), Japan Meteorological Agency
  • Originating_or_generating_Subcenter = Reanalysis project
  • GRIB_table_version = 0,200
  • Generating_process_or_model = Japanese 55-year Reanalysis (JRA-55)
  • file_format = GRIB-1
  • Conventions = CF-1.6
  • history = Read using CDM IOSP GribCollection v3
  • featureType = GRID
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