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 2019/08/31 .

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:

• http://www.cpc.ncep.noaa.gov/products/wesley/reanalysis2/kana/reanl2-1.htm
• NCEP-DOE AMIP-II Reanalysis (R-2): M. Kanamitsu, W. Ebisuzaki, J. Woollen, S-K Yang, J.J. Hnilo, M. Fiorino, and G. L. Potter. 1631-1643, Nov 2002, Bulletin of the American Meteorological Society.

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