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NCEP-DOE Reanalysis 2: Gaussian Grid

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 2013/12/31 .

Spatial Coverage:

  • Global T62 Gaussian grid (192x94).
  • 88.542N-88.542S, 0E-358.125E

Levels:

  • Surface or near the surface, nominal top of atmosphere(NTAT), entire atmosphere as a column, cloud pressure levels

Update Schedule:

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

Download/Plot Data:



These variables are forecasts valid 6 hours after the reference time.

Variable Statistic Level Download File Create Plot/Subset
Air Temperature 4-times Daily Values 2m See list plot
Air Temperature Daily Mean 2m See list plot
Air Temperature Monthly Mean 2m air.2m.mon.mean.nc plot
Ice concentration 4-times Daily Values Surface See list plot
Ice concentration Daily Mean Surface See list plot
Ice concentration Monthly Mean Surface icec.sfc.mon.mean.nc plot
Pressure 4-times Daily Values Surface See list plot
Pressure Daily Mean Surface See list plot
Pressure Monthly Mean Surface pres.sfc.mon.mean.nc plot
Specific humidity 4-times Daily Values 2m See list plot
Specific humidity Daily Mean 2m See list plot
Specific humidity Monthly Mean 2m shum.2m.mon.mean.nc plot
Maximum temperature 4-times Daily Values 2m See list plot
Maximum temperature Daily Maximum 2m See list plot
Maximum temperature Monthly Mean of Daily Maxima 2m tmax.2m.mon.mean.nc plot
Minimum temperature 4-times Daily Values 2m See list plot
Minimum temperature Daily Minimum 2m See list plot
Minimum temperature Monthly Mean of Daily Minima 2m tmin.2m.mon.mean.nc plot
Skin Temperature 4-times Daily Values Surface See list plot
Skin Temperature Daily Mean Surface See list plot
Skin Temperature Monthly Mean Surface skt.sfc.mon.mean.nc plot
Soil moisture (0-10cm) Daily Mean 0-10cm See list plot
Soil moisture (0-10cm) Daily Mean 0-10cm See list plot
Soil moisture (0-10cm) Monthly Mean 0-10cm soilw.0-10cm.mon.mean.nc plot
Soil moisture (10-200cm) 4-times Daily Values 10-200cm See list plot
Soil moisture (10-200cm) Daily Mean 10-200cm See list plot
Soil moisture (10-200cm) Monthly Mean 10-200cm soilw.10-200cm plot
Temperature of 0-10cm layer 4-times Daily Values 0-10cm See list plot
Temperature of 0-10cm layer Daily Mean 0-10cm See list plot
Temperature of 0-10cm layer Monthly Mean 0-10cm tmp.0-10cm.mon.mean.nc plot
Temperature of 10-200cm layer 4-times Daily Values 10-200cm See list plot
Temperature of 10-200cm layer Daily Mean 10-200cm See list plot
Temperature of 10-200cm layer Monthly Mean 10-200cm tmp.10-200cm.mon.mean.nc plot
U-wind 4-times Daily Values 10m See list plot
U-wind Daily Mean 10m See list plot
U-wind Monthly Mean 10m uwnd.10m.mon.mean.nc plot
V-wind 4-times Daily Values 10m See list plot
V-wind Daily Mean 10m See list plot
V-wind Monthly Mean 10m vwnd.10m.mon.mean.nc plot
Water equiv. of snow depth 4-times Daily Values Surface See list plot
Water equiv. of snow depth Daily Mean Surface See list plot
Water equiv. of snow depth Monthly Mean Surface weasd.sfc.mon.mean.nc plot


These variables are accumulations, but the monthly mean averages dailies.

Variable Statistic Level Download File Create Plot/Subset
Water Runoff 6-hour Accumulation Surface See list plot
Water Runoff Daily Accumulation Surface See list plot
Water Runoff Monthly Mean Surface runof.sfc.mon.mean.nc plot


These variables are 6 hour averages starting at the reference time.

Variable Statistic Level Download File Create Plot/Subset
Convective precipitation rate 4-times Daily Values Surface See list plot
Convective precipitation rate Daily Mean Surface See list plot
Convective precipitation rate Monthly Mean Surface cprat.sfc.mon.mean.nc plot
Downward longwave radiation flux 4-times Daily Values Surface See list plot
Downward longwave radiation flux Daily Mean Surface See list plot
Downward longwave radiation flux Monthly Mean Surface dlwrf.sfc.mon.mean.nc plot
Downward solar radiation flux 4-times Daily Values Surface See list plot
Downward solar radiation flux Daily Mean Surface See list plot
Downward solar radiation flux Monthly Mean Surface dswrf.sfc.mon.mean.nc plot
Downward solar radiation flux 4-times Daily Values NTAT See list plot
Downward solar radiation flux Daily Mean NTAT See list plot
Downward solar radiation flux Monthly Mean NTAT dswrf.ntat.mon.mean.nc plot
Ground heat flux 4-times Daily Values Surface See list plot
Ground heat flux Daily Mean Surface See list plot
Ground heat flux Monthly Mean Surface gflux.sfc.mon.mean.nc plot
Latent heat net flux 4-times Daily Values Surface See list plot
Latent heat net flux Daily Mean Surface See list plot
Latent heat net flux Monthly Mean Surface lhtfl.sfc.mon.mean.nc plot
Potential evaporation rate 4-times Daily Values Surface See list plot
Potential evaporation rate Daily Mean Surface See list plot
Potential evaporation rate Monthly Mean Surface pevpr.sfc.mon.mean.nc plot
Precipitation rate 4-times Daily Values Surface See list plot
Precipitation rate Daily Mean Surface See list plot
Precipitation rate Monthly Mean Surface prate.sfc.mon.mean.nc plot
Pressure at high cloud bottom 4-times Daily Values High Cloud Bottom See list plot
Pressure at high cloud bottom Daily Mean High Cloud Bottom See list plot
Pressure at high cloud bottom Monthly Mean High Cloud Bottom pres.hcb.mon.mean.nc plot
Pressure at high cloud top 4-times Daily Values High Cloud Top See list plot
Pressure at high cloud top Daily Mean High Cloud Top See list plot
Pressure at high cloud top Monthly Mean High Cloud Top pres.hct.mon.mean.nc plot
Pressure at low cloud bottom 4-times Daily Values Low Cloud Bottom See list plot
Pressure at low cloud bottom Daily Mean Low Cloud Bottom See list plot
Pressure at low cloud bottom Monthly Mean Low Cloud Bottom pres.lcb.mon.mean.nc plot
Pressure at low cloud top 4-times Daily Values low cloud top See list plot
Pressure at low cloud top Daily Mean low cloud top See list plot
Pressure at low cloud top Monthly Mean low cloud top pres.lct.mon.mean.nc plot
Pressure at middle cloud bottom 4-times Daily Values middle cloud bottom See list plot
Pressure at middle cloud bottom Daily Mean middle cloud bottom See list plot
Pressure at middle cloud bottom Monthly Mean middle cloud bottom pres.mcb.mon.mean.nc plot
Pressure at middle cloud top 4-times Daily Values middle cloud top See list plot
Pressure at middle cloud top Daily Mean middle cloud top See list plot
Pressure at middle cloud top Monthly Mean middle cloud top pres.mct.mon.mean.nc plot
Sensible heat net flux 4-times Daily Values Surface See list plot
Sensible heat net flux Daily Mean Surface See list plot
Sensible heat net flux Monthly Mean Surface shtfl.sfc.mon.mean.nc plot
Total cloud cover 4-times Daily Values Surface See list plot
Total cloud cover Daily Mean Surface See list plot
Total cloud cover Monthly Mean Surface tcdc.eatm.mon.mean.nc plot
Momentum flux (zonal) 4-times Daily Values Surface See list plot
Momentum flux (zonal) Daily Mean Surface See list plot
Momentum flux (zonal) Monthly Mean Surface uflx.sfc.mon.mean.nc plot
Zonal gravity wave stress 4-times Daily Values Surface See list plot
Zonal gravity wave stress Daily Mean Surface See list plot
Zonal gravity wave stress Monthly Mean Surface ugwd.sfc.mon.mean.nc plot
Upward longwave radiation flux 4-times Daily Values Surface See list plot
Upward longwave radiation flux Daily Mean Surface See list plot
Upward longwave radiation flux Monthly Mean Surface ulwrf.sfc.mon.mean.nc plot
Upward longwave radiation flux 4-times Daily Values NTAT See list plot
Upward longwave radiation flux Daily Mean NTAT See list plot
Upward longwave radiation flux Monthly Mean NTAT ulwrf.ntat.mon.mean.nc plot
Upward solar radiation flux 4-times Daily Values Surface See list plot
Upward solar radiation flux Daily Mean Surface See list plot
Upward solar radiation flux Monthly Mean Surface uswrf.sfc.mon.mean.nc plot
Upward solar radiation flux 4-times Daily Values NTAT See list plot
Upward solar radiation flux Daily Mean NTAT See list plot
Upward solar radiation flux Monthly Mean NTAT uswrf.ntat.mon.mean.nc plot
Momentum flux (meridional) 4-times Daily Values Surface See list plot
Momentum flux (meridional) Daily Mean Surface See list plot
Momentum flux (meridional) Monthly Mean Surface vflx.sfc.mon.mean.nc plot
Meridional gravity wave stress 4-times Daily Values Surface See list plot
Meridional gravity wave stress Daily Mean Surface See list plot
Meridional gravity wave stress Monthly Mean Surface vgwd.sfc.mon.mean.nc plot
Land-sea mask time invariant Surface See list plot

Usage Restrictions:

  • None

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.

Caveats:

  • Bad MSLP data in 2004 NetCDF files: The MSLP data in the NetCDF files representing 2004 values that were added to our archives in early April, 2004, were done incorrectly. The source data from NCEP were fine; it was a processing error here. This was corrected late on 2005/06/23. If you have downloaded 2004 MSLP data from us at any of the three temporal frequencies, you are strongly urged to reacquire the data.


    Bad skin temperatures in 1982.

    The skin temperature (variable name skt) for 1982 had bad data. These data were updated late on 2003/05/14 based on new GRIB file from NCEP. All three temporal frequencies were affected and thus updated.

  • * = no year in file name

     Note:

     § The skt.sfc files contain skin temperature as described in the March, 1996 BAMS article. As such, over land and sea ice, the temperature is a prognostic variable. Over open water, the skin temperature is fixed at its initial value; i.e., the Reynolds SST as seen by the model. The Reynolds' SST analyses were done weekly and the reconstructed SST done monthly. The analyses were linearly interpolated to daily values which were used for all four analyses.

    The following variables are six hour forecast values valid six hours after the reference time: skt.sfc, air.2m, icec.sfc, pres.sfc, runof.sfc, shum.2m,  tmax.2m, tmin.2m, tmp.300cm, uwnd.10m, vwnd.10m, weasd.sfc

    The following variables are six hour averages for the period of the reference time plus six hours: cprat.sfc, dlwrf.sfc, dswrf.sfc, dswrf.ntat, gflux.sfc, lhtfl.sfc, pevpr.sfc, prate.sfc, pres.{hcb,hct,lcb,lct,mcb,mct}, shtfl.sfc, soilw.0-10cm, soilw.10-200cm, tcdc.eatm, tmp.0-10cm, tmp.10-200cm, uflx.sfc, ugwd.sfc, ulwrf.sfc, ulwrf.ntat, uswrf.sfc, uswrf.ntat, vflx.sfc, vgwd.sfc

    And, of course, land.sfc is time-invariant.

Related File Naming & Structure Information:

File Names:

  • var.time.stat.nc   (In directory: /Datasets/udel.airt.precip/)
  • Archive parameters: File names are composed of variable abbreviations, level, and year: (variable).(level).gauss.(year).nc

    These variables (air.2m - weasd) are forecasts valid 6 hours after the reference time.

Dataset Format and Size:

  • PSD standard NetCDF 311 Mbyte file for each monthly file (packed).
  • PSD standard NetCDF 30 Mbyte file for each long term mean file (packed).
  • By anonymous FTP:
    • 4x daily data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2/gaussian_grid/.
    • The 4x data files are quite large, so you may only be able to download them if you have a fast network connection.
    • Daily averages are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2.dailyavgs/gaussian_grid/.
    • The data are divided by variable and year into separate files
    • There are 1,796files currently
    • Files are 5 to 52 Mbytes per variable per year
    • Current total of 45 Gbytes for 4xDaily and 11 Gbytes for daily averages

    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 http://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