NCEP-DOE Reanalysis 2: Spectral Data

Other Grid Types: NCEP Reanalysis2 Main Page | Pressure Level Data | Surface Data | Gaussian Grid Data | Spectral Coefficents Data

Brief Description:

  • NCEP-DOE Reanalysis 2 is an improved version of the NCEP Reanalysis I model that fixed errors and updated paramterizations of of physical processes

Temporal Coverage:

  • 4-times and monthly values for 1979/01/01 to 2018/08/31 .

Spatial Coverage:

  • T62 Global Spectral Coefficients

Levels:

  • 28 Sigma levels: 0.995, 0.9821, 0.9644, 0.9425, 0.9159, 0.8838, 0.8458, 0.8014, 0.7508, 0.6943, 0.6329, 0.5681, 0.5017, 0.4357, 0.372, 0.3125, 0.2582, 0.2101, 0.1682, 0.1326, 0.1028, 0.0782, 0.058, 0.0418, 0.0288, 0.0183, 0.0101, 0.0027

Update Schedule:

  • Updated adding the previous year's data occur during the first quarter of the next.

Download/Plot Data:

Variable Statistic Level Download File Create Plot/Subset
Divergence 4-times Daily Values Sigma Levels ftp to ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/spectral/div.spec.yyyy.nc N/A
Relative Vorticity 4-times Daily Values Sigma Levels ftp to ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/spectral/vort.spec.yyyy.nc N/A
Specific Humidity 4-times Daily Values Sigma Levels ftp to ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/spectral/shum.spec.yyyy.nc N/A
Virtual Temperature 4-times Daily Values Sigma Levels ftp to ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/spectral/vair.spec.yyyy.nc N/A
Natural Log of Surface Pressure 4-times Daily Values Surface ftp to ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/spectral/pres.nlog.sfc.spec.yyyy.nc N/A
Orography 4-times Daily Values Surface orog.spec.nc N/A

Detailed Description:

  • The NCEP-DOE Reanalysis 2 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1979 through the previous year. A large subset of this data is available from PSD in its original 4 times daily format and as daily averages.

    Please note: If you acquire NCEP Reanalysis 2 data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as NCEP Reanalysis 2 data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at https://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the NCEP Reanalysis 2 data set freely available online in the future. Thank you!

Caveats:

  • orig.sfc is time invariant.

Related File Naming & Structure Information:

File Names:

  • var.yyyy.nc   (In directory: /Datasets/ncep.reabnalysis2/spectral/)

Dataset Format and Size:

  • All data are stored in NetCDF files
  • Data is packed in those files.
  • Yearly files are about 330M each. There are 137 total.
  • By anonymous FTP:
    • 4x daily data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2/spectral/.
    • The 4x data files are quite large, so you may only be able to download them if you have a fast network connection.

    Missing Data:

    • None.

Citation:

  • Please note: If you acquire NCEP/DOE 2 Reanalysis data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as NCEP/DOE 2 Reanalysis data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at https://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the NCEP/DOE 2 Reanalysis data set freely available online in the future. Thank you!

References:

Original Source:

  • NOAA National Centers for Environmental Predictions

Contact:

  • Physical Sciences Division: Data Management
    NOAA/ESRL/PSD
    325 Broadway
    Boulder, CO 80305-3328
    esrl.psd.data@noaa.gov