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Twentieth Century Reanalysis (V2): Monthly Mean Single Level (Analyses and Forecasts)

We have transitioned the data files from netCDF3 to netCDF4-classic format. As a result, the files are compressed instead of being packed with a scale and offset. As with any netCDF4 file, the user interface will perform the uncompression. We expect the files to be read faster, depending on the application you are using. Please let us know if you run into any issues.
[ Data Type: Pressure Level | Single Level | Subsurface | Monthly Mean Pressure Level | Monthly Mean Single Level | Monthly Mean Subsurface ]

Brief Description:

  • 20th Century Reanalysis contains objectively-analyzed 4-dimensional weather maps and their uncertainty for most of the 1900's.

Temporal Coverage:

  • Monthly values for 1871/01 to 2012/12.
  • Monthly Regular Grids are from 4-times Daily Analysis.
  • Monthly Gaussian Grids are from 8-times Daily 3-hr Forecasts.
  • Long Term Mean Monthly values averaged 1981-2008 .

Spatial Coverage:

    Analyses
  • 2.0 degree latitude x 2.0 degree longitude global grid (180x91).
  • 90N - 90.0S, 0.0E - 358.E.
  • 3-Hour Forecasts
  • ~2.0 degree latitude x 1.75 degree longitude global grid (192x94).
  • T62 Gaussian grid with 192x94 points
  • 88.542N-88.542S, 0E-358.125E.

Levels:

  • single level files

Update Schedule:

  • Subsequent years are will be updated at the end of each year.

Usage Restrictions:

  • None

Detailed Description:

  • The analysis is performed with the Ensemble Filter as described in Compo et al. (2010) based on the method of Whitaker and Hamill (2002). The fields containing the mean and the spread (i.e., standard deviation) of the analysis ensemble are archived here. Observations of surface pressure and sea level pressure from the International Surface Pressure Databank station component version 2 (Yin et al. 2008), ICOADS (Woodruff et al. 2009), and the International Best Track Archive for Climatic Stewardship (IBTrACS, Kruk et al. 2010) were assimilated every six hours. The surface pressure observations have been made available through international cooperation facilitated by the Atmospheric Circulation Reconstructions over the Earth (ACRE) initiative and working groups of the Global Climate Observing System and World Climate Research Programme. The short-term forecast ensemble is generated in parallel from 56 9-hour integrations of a state-of-the-art atmospheric general circulation model, a 2008 updated experimental version of the atmospheric component of NCEP's operational Climate Forecast System model (Saha et al. 2006). Briefly, the model has a spatial resolution of nearly 200-km on an irregular Gaussian grid in the horizontal (corresponding to a spherical harmonic representation of model fields truncated at total wavenumber 62, T62). In the vertical, we use finite differencing of 28 levels. The model has a complete suite of physical parameterizations as described in Kanamitsu et al. (1991) with recent updates detailed in Moorthi et al. (2001). Additional updates to these parameterizations are described in Saha et al. and include revised solar radiation transfer, boundary layer vertical diffusion, cumulus convection, and gravity wave drag parameterizations. In addition, the cloud liquid water is a prognostic quantity with a simple cloud microphysics parameterization. The radiation interacts with a fractional cloud cover that is diagnostically determined by the predicted cloud liquid water. The 2008 experimental version of the model used for the 20th Century Reanalysis also includes the radiative effects of historical time-varying CO2 concentrations, volcanic aerosol and solar variations using the longwave radiation model of Mlawer et al. (1997) and shortwave radiation model of Hou et al. (2002). The specified boundary conditions needed to run the model in atmosphere-only mode are taken from the time-evolving sea surface temperature and sea ice concentration fields of the HadISST1.1 dataset obtained courtesy of the United Kingdom Met Office Hadley Centre (Rayner et al. 2003). he analysis is performed with the Ensemble Filter as described in Compo et al. (2010) based on the method of Whitaker and Hamill (2002).
    • Compo, G.P., J.S. Whitaker, P.D. Sardeshmukh, N. Matsui, R.J. Allan, X. Yin, B.E. Gleason, R.S. Vose, G. Rutledge, P. Bessemoulin, S. Brönnimann, M. Brunet, R.I. Crouthamel, A.N. Grant, P.Y. Groisman, P.D. Jones, M. Kruk, A.C. Kruger, G.J. Marshall, M. Maugeri, H.Y. Mok, Ř. Nordli, T.F. Ross, R.M. Trigo, X.L. Wang, S.D. Woodruff, and S.J. Worley, 2011: The Twentieth Century Reanalysis Project. Quarterly J. Roy. Meteorol. Soc., 137, 1-28. DOI: 10.1002/qj.776.
    • Compo, G.P., J.S. Whitaker, and P.D. Sardeshmukh, 2006: Feasibility of a 100 year reanalysis using only surface pressure data. Bull. Amer. Met. Soc., 87, 175-190.
    • Gleason, B.E., G.P. Compo, N. Matsui, X. Yin, and R.S. Vose, 2008: The International Surface Pressure Databank (ISPD) land component version 2.2, National Climatic Data Center, Asheville, NC, pp. 1-12. [Available on line at ftp://ftp.ncdc.noaa.gov/pub/data/ispd/doc/ISPD2_2.pdf ]
    • Hou, Y,. S. Moorthi and K. Compana, 2002: Parameterization of solar radiation transfer in NCEP models. NCEP Office Note #441. [Available at http://www.emc.ncep.noaa.gov/officenotes/FullTOC.html#2000]
    • Kanamitsu, M, and Coauthors 1991: Recent changes implemented into the global forecast system at NMC. Wea. Forecasting, 6, 425-435. Knapp K.R., M.C. Kruk, D.H. Levinson, H.J. Diamond, and C.J. Neumann, 2009: The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data. Bulletin of the American Meteorological Society: In Press, DOI: 10.1175/2009BAMS2755.1
    • Mlawer, E. J., S. J. Taubman, P. D. Brown, M. J. Iacono, and S. A. Clough, 1997: Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave. J. Geophys. Res., 102(D14), 16,663-16,682
    • Moorthi, S., H.-L. Pan, and P. Caplan, 2001: Changes to the 2001 NCEP operational MRF/AVN global analysis/forecast system. NWS Tech. Procedures Bulletin 484, 14 pp. [Available online at http://www.nws.noaa.gov/om/tpb/484.htm.]
    • Rayner, N.A., D.E. Parker, E.B. Horton, C.K. Folland, L.V. Alexander, D.P. Rowell, E.C Kent, and A. Kaplan, 2003: Global analyses of SST, sea ice and night marine air temperature since the late nineteenth century. J. Geophys. Res., 108, 4407, doi:10.1029/2002JD002670.
    • Saha, S. and Coauthors, 2006: The NCEP Climate Forecast System. J. Climate, 19, 3483-3517.
    • Whitaker, J. S., and T.M. Hamill, 2002: Ensemble data assimilation without perturbed observations. Mon. Wea. Rev., 130, 1913-1924.
    • Woodruff, S.D., S.J.Worley, S.J. Lubker, Z. Ji, J.E. Freeman, D.I. Berry, P. Brohan, E.C. Kent, R.W. Reynolds, S.R. Smith, and C. Wilkinson, 2009: ICOADS release 2.5: Extensions and enhancements to the surface marine meteorological archive. Int. J. Climatol., submitted.

Caveats:

Note: We have removed the monthly wind speed files. They were calculated using ensmeble means rather than individual ensemble members, averaged. This could result in an underestimation of average wind speeds, particurlay in certain places. We may recalculate these at a later date.

We have transitioned the data files from netCDF3 to netCDF4-classic format. As a result, the files are compressed instead of being packed with a scale and offset. As with any netCDF4 file, the user interface will perform the uncompression. We expect the files to be read faster, depending on the application you are using. Please let us know if you run into any issues.

Download/Plot Data:

Variable Statistic Level Download File Create Plot/Subset
Air temperature Monthly Means sigma level 0.995 air.sig995.mon.mean.nc plot File Metadata
Air temperature Monthly Long Term Means sigma level 0.995 air.sig995.mon.ltm.nc plot File Metadata
Air temperature Monthly Ensemble Spreads sigma level 0.995 air.sig995.mon.mean.nc plot File Metadata
Air temperature Monthly Long Term Mean Ensemble Spreads sigma level 0.995 air.sig995.mon.ltm.nc plot File Metadata
Air temperature Monthly Means Tropopause air.tropo.mon.mean.nc plot File Metadata
Air temperature Monthly Long Term Means Tropopause air.tropo.mon.ltm.nc plot File Metadata
Air temperature Monthly Ensemble Spreads Tropopause air.tropo.mon.mean.nc plot File Metadata
Air temperature Monthly Long Term Mean Ensemble Spreads Tropopause air.tropo.mon.ltm.nc plot File Metadata
convective available potential energy Monthly Means Surface cape.mon.mean.nc plot File Metadata
convective available potential energy Monthly Long Term Means Surface cape.mon.ltm.nc plot File Metadata
convective available potential energy Monthly Ensemble Spreads Surface cape.mon.mean.nc plot File Metadata
convective available potential energy Monthly Long Term Mean Ensemble Spreads Surface cape.mon.ltm.nc plot File Metadata
convective inhibition Monthly Means Surface cin.mon.mean.nc plot File Metadata
convective inhibition Monthly Long Term Means Surface cin.mon.ltm.nc plot File Metadata
convective inhibition Monthly Ensemble Spreads Surface cin.mon.mean.nc plot File Metadata
convective inhibition Monthly Long Term Mean Ensemble Spreads Surface cin.mon.ltm.nc plot File Metadata
Cloud Water Content Monthly Means Entire Atmosphere Considered As a Single Layer cldwtr.eatm.mon.mean.nc plot File Metadata
Cloud Water Content Monthly Long Term Means Entire Atmosphere Considered As a Single Layer cldwtr.eatm.mon.ltm.nc plot File Metadata
Cloud Water Content Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer cldwtr.eatm.mon.mean.nc plot File Metadata
Cloud Water Content Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer cldwtr.eatm.mon.ltm.nc plot File Metadata
Geopotential height Monthly Means Tropopause hgt.tropo.mon.mean.nc plot File Metadata
Geopotential height Monthly Long Term Means Tropopause hgt.tropo.mon.ltm.nc plot File Metadata
Geopotential height Monthly Ensemble Spreads Tropopause hgt.tropo.mon.mean.nc plot File Metadata
Geopotential height Monthly Long Term Mean Ensemble Spreads Tropopause hgt.tropo.mon.ltm.nc plot File Metadata
Omega (dp/dt) Monthly Means sigma level 0.995 omega.sig995.mon.mean.nc plot File Metadata
Omega (dp/dt) Monthly Long Term Means sigma level 0.995 omega.sig995.mon.ltm.nc plot File Metadata
Omega (dp/dt) Monthly Ensemble Spreads sigma level 0.995 omega.sig995.mon.mean.nc plot File Metadata
Omega (dp/dt) Monthly Long Term Mean Ensemble Spreads sigma level 0.995 omega.sig995.mon.ltm.nc plot File Metadata
Potential Temperature Monthly Means sigma level 0.995 pottmp.sig995.mon.mean.nc plot File Metadata
Potential Temperature Monthly Long Term Means sigma level 0.995 pottmp.sig995.mon.ltm.nc plot File Metadata
Potential Temperature Monthly Ensemble Spreads sigma level 0.995 pottmp.sig995.mon.mean.nc plot File Metadata
Potential Temperature Monthly Long Term Mean Ensemble Spreads sigma level 0.995 pottmp.sig995.mon.ltm.nc plot File Metadata
Precipitable Water Content Monthly Means Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.mean.nc plot File Metadata
Precipitable Water Content Monthly Long Term Means Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.ltm.nc plot File Metadata
Precipitable Water Content Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.mean.nc plot File Metadata
Precipitable Water Content Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.ltm.nc plot File Metadata
Pressure Monthly Means Surface pres.sfc.mon.mean.nc plot File Metadata
Pressure Monthly Long Term Means Surface pres.sfc.mon.ltm.nc plot File Metadata
Pressure Monthly Ensemble Spreads Surface pres.sfc.mon.mean.nc plot File Metadata
Pressure Monthly Long Term Mean Ensemble Spreads Surface pres.sfc.mon.ltm.nc plot File Metadata
Pressure Monthly Means Tropopause pres.tropo.mon.mean.nc plot File Metadata
Pressure Monthly Long Term Means Tropopause pres.tropo.mon.ltm.nc plot File Metadata
Pressure Monthly Ensemble Spreads Tropopause pres.tropo.mon.mean.nc plot File Metadata
Pressure Monthly Long Term Mean Ensemble Spreads Tropopause pres.tropo.mon.ltm.nc plot File Metadata
Mean Sea Level Pressure Monthly Means Mean Sea Level prmsl.mon.mean.nc plot File Metadata
Mean Sea Level Pressure Monthly Long Term Means Mean Sea Level prmsl.mon.ltm.nc plot File Metadata
Mean Sea Level Pressure Monthly Ensemble Spreads Mean Sea Level prmsl.mon.mean.nc plot File Metadata
Mean Sea Level Pressure Monthly Long Term Mean Ensemble Spreads Mean Sea Level prmsl.mon.ltm.nc plot File Metadata
Relative Humidity Monthly Means sigma level 0.995 rhum.sig995.mon.mean.nc plot File Metadata
Relative Humidity Monthly Long Term Means sigma level 0.995 rhum.sig995.mon.ltm.nc plot File Metadata
Relative Humidity Monthly Ensemble Spreads sigma level 0.995 rhum.sig995.mon.mean.nc plot File Metadata
Relative Humidity Monthly Long Term Mean Ensemble Spreads sigma level 0.995 rhum.sig995.mon.ltm.nc plot File Metadata
total columnar ozone Monthly Means Entire Atmosphere Considered As a Single Layer tco3.eatm.mon.mean.nc plot File Metadata
total columnar ozone Monthly Long Term Means Entire Atmosphere Considered As a Single Layer tco3.eatm.mon.ltm.nc plot File Metadata
total columnar ozone Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer tco3.eatm.mon.mean.nc plot File Metadata
total columnar ozone Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer tco3.eatm.mon.ltm.nc plot File Metadata
u-wind Monthly Means sigma level 0.995 uwnd.sig995.mon.mean.nc plot File Metadata
u-wind Monthly Long Term Means sigma level 0.995 uwnd.sig995.mon.ltm.nc plot File Metadata
u-wind Monthly Ensemble Spreads sigma level 0.995 uwnd.sig995.mon.mean.nc plot File Metadata
u-wind Monthly Long Term Mean Ensemble Spreads sigma level 0.995 uwnd.sig995.mon.ltm.nc plot File Metadata
u-wind Monthly Means Tropopause uwnd.tropo.mon.mean.nc plot File Metadata
u-wind Monthly Long Term Means Tropopause uwnd.tropo.mon.ltm.nc plot File Metadata
u-wind Monthly Ensemble Spreads Tropopause uwnd.tropo.mon.mean.nc plot File Metadata
u-wind Monthly Long Term Mean Ensemble Spreads Tropopause uwnd.tropo.mon.ltm.nc plot File Metadata
v-wind Monthly Means sigma level 0.995 vwnd.sig995.mon.mean.nc plot File Metadata
v-wind Monthly Long Term Means sigma level 0.995 vwnd.sig995.mon.ltm.nc plot File Metadata
v-wind Monthly Ensemble Spreads sigma level 0.995 vwnd.sig995.mon.mean.nc plot File Metadata
v-wind Monthly Long Term Mean Ensemble Spreads sigma level 0.995 vwnd.sig995.mon.ltm.nc plot File Metadata
v-wind Monthly Means Tropopause vwnd.tropo.mon.mean.nc plot File Metadata
v-wind Monthly Long Term Means Tropopause vwnd.tropo.mon.ltm.nc plot File Metadata
v-wind Monthly Ensemble Spreads Tropopause vwnd.tropo.mon.mean.nc plot File Metadata
v-wind Monthly Long Term Mean Ensemble Spreads Tropopause vwnd.tropo.mon.ltm.nc plot File Metadata

Gaussian Gridded (192x94) data. From 3-hr Forecast Values (8 times daily)

Variable Statistic Level Download File Create Plot/Subset
Air Temperature Monthly Means 2 m air.2m.mon.mean.nc plot File Metadata
Air Temperature Monthly Long Term Means 2 m air.2m.mon.ltm.nc plot File Metadata
Air Temperature Monthly Ensemble Spreads 2 m air.2m.mon.mean.nc plot File Metadata
Air Temperature Monthly Long Term Mean Ensemble Spreads 2 m air.2m.mon.ltm.nc plot File Metadata
Air Temperature Monthly Means Surface air.sfc.mon.mean.nc plot File Metadata
Air Temperature Monthly Long Term Means Surface air.sfc.mon.ltm.nc plot File Metadata
Air Temperature Monthly Ensemble Spreads Surface air.sfc.mon.mean.nc plot File Metadata
Air Temperature Monthly Long Term Mean Ensemble Spreads Surface air.sfc.mon.ltm.nc plot File Metadata
Albedo Monthly Means Surface albedo.mon.mean.nc plot File Metadata
Albedo Monthly Long Term Means Surface albedo.mon.ltm.nc plot File Metadata
Albedo Monthly Ensemble Spreads Surface albedo.mon.mean.nc plot File Metadata
Albedo Monthly Long Term Mean Ensemble Spreads Surface albedo.mon.ltm.nc plot File Metadata
Convective Precipitation Rate Monthly Means Surface cprat.mon.mean.nc plot File Metadata
Convective Precipitation Rate Monthly Long Term Means Surface cprat.mon.ltm.nc plot File Metadata
Convective Precipitation Rate Monthly Ensemble Spreads Surface cprat.mon.mean.nc plot File Metadata
Convective Precipitation Rate Monthly Long Term Mean Ensemble Spreads Surface cprat.mon.ltm.nc plot File Metadata
Cloud Work Function Monthly Means Entire Atmosphere Considered As a Single Layer cwork.eatm.mon.mean.nc plot File Metadata
Cloud Work Function Monthly Long Term Means Entire Atmosphere Considered As a Single Layer cwork.eatm.mon.ltm.nc plot File Metadata
Cloud Work Function Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer cwork.eatm.mon.mean.nc plot File Metadata
Cloud Work Function Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer cwork.eatm.mon.ltm.nc plot File Metadata
Downward Longwave Radiation Flux Monthly Means Surface dlwrf.sfc.mon.mean.nc plot File Metadata
Downward Longwave Radiation Flux Monthly Long Term Means Surface dlwrf.sfc.mon.ltm.nc plot File Metadata
Downward Longwave Radiation Flux Monthly Ensemble Spreads Surface dlwrf.sfc.mon.mean.nc plot File Metadata
Downward Longwave Radiation Flux Monthly Long Term Mean Ensemble Spreads Surface dlwrf.sfc.mon.ltm.nc plot File Metadata
Downward Solar Radiation Flux Monthly Means Surface dswrf.sfc.mon.mean.nc plot File Metadata
Downward Solar Radiation Flux Monthly Long Term Means Surface dswrf.sfc.mon.ltm.nc plot File Metadata
Downward Solar Radiation Flux Monthly Ensemble Spreads Surface dswrf.sfc.mon.mean.nc plot File Metadata
Downward Solar Radiation Flux Monthly Long Term Mean Ensemble Spreads Surface dswrf.sfc.mon.ltm.nc plot File Metadata
Ground Heat Flux Monthly Means Surface gflux.mon.mean.nc plot File Metadata
Ground Heat Flux Monthly Long Term Means Surface gflux.mon.ltm.nc plot File Metadata
Ground Heat Flux Monthly Ensemble Spreads Surface gflux.mon.mean.nc plot File Metadata
Ground Heat Flux Monthly Long Term Mean Ensemble Spreads Surface gflux.mon.ltm.nc plot File Metadata
Planetary Boundary Layer Height Monthly Means Surface hpbl.mon.mean.nc plot File Metadata
Planetary Boundary Layer Height Monthly Long Term Means Surface hpbl.mon.ltm.nc plot File Metadata
Planetary Boundary Layer Height Monthly Ensemble Spreads Surface hpbl.mon.mean.nc plot File Metadata
Planetary Boundary Layer Height Monthly Long Term Mean Ensemble Spreads Surface hpbl.mon.ltm.nc plot File Metadata
Ice Concentration Monthly Means Surface icec.mon.mean.nc plot File Metadata
Ice Concentration Monthly Long Term Means Surface icec.mon.ltm.nc plot File Metadata
ice thickness Monthly Means Surface icet.mon.mean.nc plot File Metadata
ice thickness Monthly Long Term Means Surface icet.mon.ltm.nc plot File Metadata
ice thickness Monthly Ensemble Spreads Surface icet.mon.mean.nc plot File Metadata
ice thickness Monthly Long Term Mean Ensemble Spreads Surface icet.mon.ltm.nc plot File Metadata
Latent Heat Net Flux Monthly Means Surface lhtfl.mon.mean.nc plot File Metadata
Latent Heat Net Flux Monthly Long Term Means Surface lhtfl.mon.ltm.nc plot File Metadata
Latent Heat Net Flux Monthly Ensemble Spreads Surface lhtfl.mon.mean.nc plot File Metadata
Latent Heat Net Flux Monthly Long Term Mean Ensemble Spreads Surface lhtfl.mon.ltm.nc plot File Metadata
Potential Evaporation Rate Monthly Means Surface pevpr.mon.mean.nc plot File Metadata
Potential Evaporation Rate Monthly Long Term Means Surface pevpr.mon.ltm.nc plot File Metadata
Potential Evaporation Rate Monthly Ensemble Spreads Surface pevpr.mon.mean.nc plot File Metadata
Potential Evaporation Rate Monthly Long Term Mean Ensemble Spreads Surface pevpr.mon.ltm.nc plot File Metadata
Precipitable Water Content Monthly Means Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.mean.nc plot File Metadata
Precipitable Water Content Monthly Long Term Means Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.ltm.nc plot File Metadata
Precipitable Water Content Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.mean.nc plot File Metadata
Precipitable Water Content Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer pr_wtr.eatm.mon.ltm.nc plot File Metadata
Precipitation Rate Monthly Means Surface prate.mon.mean.nc plot File Metadata
Precipitation Rate Monthly Long Term Means Surface prate.mon.ltm.nc plot File Metadata
Precipitation Rate Monthly Ensemble Spreads Surface prate.mon.mean.nc plot File Metadata
Precipitation Rate Monthly Long Term Mean Ensemble Spreads Surface prate.mon.ltm.nc plot File Metadata
Surface Pressure Monthly Means Surface press.sfc.mon.mean.nc plot File Metadata
Surface Pressure Monthly Long Term Means Surface press.sfc.mon.ltm.nc plot File Metadata
Surface Pressure Monthly Ensemble Spreads Surface press.sfc.mon.mean.nc plot File Metadata
Surface Pressure Monthly Long Term Mean Ensemble Spreads Surface press.sfc.mon.ltm.nc plot File Metadata
Water Runoff Monthly Means Surface runoff.mon.mean.nc plot File Metadata
Water Runoff Monthly Long Term Means Surface runoff.mon.ltm.nc plot File Metadata
Water Runoff Monthly Ensemble Spreads Surface runoff.mon.mean.nc plot File Metadata
Water Runoff Monthly Long Term Mean Ensemble Spreads Surface runoff.mon.ltm.nc plot File Metadata
Sensible Heat Net Flux Monthly Means Surface shtfl.mon.mean.nc plot File Metadata
Sensible Heat Net Flux Monthly Long Term Means Surface shtfl.mon.ltm.nc plot File Metadata
Sensible Heat Net Flux Monthly Ensemble Spreads Surface shtfl.mon.mean.nc plot File Metadata
Sensible Heat Net Flux Monthly Long Term Mean Ensemble Spreads Surface shtfl.mon.ltm.nc plot File Metadata
Specific Humidity Monthly Means 2 m shum.2m.mon.mean.nc plot File Metadata
Specific Humidity Monthly Long Term Means 2 m shum.2m.mon.ltm.nc plot File Metadata
Specific Humidity Monthly Ensemble Spreads 2 m shum.2m.mon.mean.nc plot File Metadata
Specific Humidity Monthly Long Term Mean Ensemble Spreads 2 m shum.2m.mon.ltm.nc plot File Metadata
snow depth Monthly Means Surface snod.mon.mean.nc plot File Metadata
snow depth Monthly Long Term Means Surface snod.mon.ltm.nc plot File Metadata
snow depth Monthly Ensemble Spreads Surface snod.mon.mean.nc plot File Metadata
snow depth Monthly Long Term Mean Ensemble Spreads Surface snod.mon.ltm.nc plot File Metadata
snow cover Monthly Means Surface snowc.mon.mean.nc plot File Metadata
snow cover Monthly Long Term Means Surface snowc.mon.ltm.nc plot File Metadata
snow cover Monthly Ensemble Spreads Surface snowc.mon.mean.nc plot File Metadata
snow cover Monthly Long Term Mean Ensemble Spreads Surface snowc.mon.ltm.nc plot File Metadata
soil moisture content Monthly Means Surface soilm.mon.mean.nc plot File Metadata
soil moisture content Monthly Long Term Means Surface soilm.mon.ltm.nc plot File Metadata
soil moisture content Monthly Ensemble Spreads Surface soilm.mon.mean.nc plot File Metadata
soil moisture content Monthly Long Term Mean Ensemble Spreads Surface soilm.mon.ltm.nc plot File Metadata
storm surface runoff Monthly Means Surface ssrunoff.mon.mean.nc plot File Metadata
storm surface runoff Monthly Long Term Means Surface ssrunoff.mon.ltm.nc plot File Metadata
storm surface runoff Monthly Ensemble Spreads Surface ssrunoff.mon.mean.nc plot File Metadata
storm surface runoff Monthly Long Term Mean Ensemble Spreads Surface ssrunoff.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Boundary Layer tcdc.bndrylyr.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Boundary Layer tcdc.bndrylyr.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Boundary Layer tcdc.bndrylyr.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Boundary Layer tcdc.bndrylyr.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Convective Cloud Layer tcdc.convcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Convective Cloud Layer tcdc.convcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Convective Cloud Layer tcdc.convcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Convective Cloud Layer tcdc.convcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Entire Atmosphere Considered As a Single Layer tcdc.eatm.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Entire Atmosphere Considered As a Single Layer tcdc.eatm.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Entire Atmosphere Considered As a Single Layer tcdc.eatm.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Entire Atmosphere Considered As a Single Layer tcdc.eatm.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Low Cloud Layer tcdc.lowcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Low Cloud Layer tcdc.lowcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Low Cloud Layer tcdc.lowcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Low Cloud Layer tcdc.lowcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Middle Cloud Layer tcdc.midcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Middle Cloud Layer tcdc.midcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Middle Cloud Layer tcdc.midcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Middle Cloud Layer tcdc.midcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Means Top Cloud Layer tcdc.topcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Means Top Cloud Layer tcdc.topcld.mon.ltm.nc plot File Metadata
Total cloud cover Monthly Ensemble Spreads Top Cloud Layer tcdc.topcld.mon.mean.nc plot File Metadata
Total cloud cover Monthly Long Term Mean Ensemble Spreads Top Cloud Layer tcdc.topcld.mon.ltm.nc plot File Metadata
Maximum Temperature Monthly Means 2 m tmax.2m.mon.mean.nc plot File Metadata
Maximum Temperature Monthly Long Term Means 2 m tmax.2m.mon.ltm.nc plot File Metadata
Maximum Temperature Monthly Ensemble Spreads 2 m tmax.2m.mon.mean.nc plot File Metadata
Maximum Temperature Monthly Long Term Mean Ensemble Spreads 2 m tmax.2m.mon.ltm.nc plot File Metadata
Minimum Temperature Monthly Means 2 m tmin.2m.mon.mean.nc plot File Metadata
Minimum Temperature Monthly Long Term Means 2 m tmin.2m.mon.ltm.nc plot File Metadata
Minimum Temperature Monthly Ensemble Spreads 2 m tmin.2m.mon.mean.nc plot File Metadata
Minimum Temperature Monthly Long Term Mean Ensemble Spreads 2 m tmin.2m.mon.ltm.nc plot File Metadata
transpiration Monthly Means Surface trans.mon.mean.nc plot File Metadata
transpiration Monthly Long Term Means Surface trans.mon.ltm.nc plot File Metadata
transpiration Monthly Ensemble Spreads Surface trans.mon.mean.nc plot File Metadata
transpiration Monthly Long Term Mean Ensemble Spreads Surface trans.mon.ltm.nc plot File Metadata
Momentum Flux, u-component Monthly Means Surface uflx.mon.mean.nc plot File Metadata
Momentum Flux, u-component Monthly Long Term Means Surface uflx.mon.ltm.nc plot File Metadata
Momentum Flux, u-component Monthly Ensemble Spreads Surface uflx.mon.mean.nc plot File Metadata
Momentum Flux, u-component Monthly Long Term Mean Ensemble Spreads Surface uflx.mon.ltm.nc plot File Metadata
Zonal Gravity Wave Stress Monthly Means Surface ugwd.mon.mean.nc plot File Metadata
Zonal Gravity Wave Stress Monthly Long Term Means Surface ugwd.mon.ltm.nc plot File Metadata
Zonal Gravity Wave Stress Monthly Ensemble Spreads Surface ugwd.mon.mean.nc plot File Metadata
Zonal Gravity Wave Stress Monthly Long Term Mean Ensemble Spreads Surface ugwd.mon.ltm.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Means Nominal top of atmosphere ulwrf.ntat.mon.mean.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Long Term Means Nominal top of atmosphere ulwrf.ntat.mon.ltm.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Ensemble Spreads Nominal top of atmosphere ulwrf.ntat.mon.mean.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Long Term Mean Ensemble Spreads Nominal top of atmosphere ulwrf.ntat.mon.ltm.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Means Surface ulwrf.sfc.mon.mean.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Long Term Means Surface ulwrf.sfc.mon.ltm.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Ensemble Spreads Surface ulwrf.sfc.mon.mean.nc plot File Metadata
Upward Longwave Radiation Flux Monthly Long Term Mean Ensemble Spreads Surface ulwrf.sfc.mon.ltm.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Means Nominal top of atmosphere uswrf.ntat.mon.mean.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Long Term Means Nominal top of atmosphere uswrf.ntat.mon.ltm.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Ensemble Spreads Nominal top of atmosphere uswrf.ntat.mon.mean.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Long Term Mean Ensemble Spreads Nominal top of atmosphere uswrf.ntat.mon.ltm.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Means Surface uswrf.sfc.mon.mean.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Long Term Means Surface uswrf.sfc.mon.ltm.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Ensemble Spreads Surface uswrf.sfc.mon.mean.nc plot File Metadata
Upward Shortwave Radiation Flux Monthly Long Term Mean Ensemble Spreads Surface uswrf.sfc.mon.ltm.nc plot File Metadata
U-wind Monthly Means 10 m uwnd.10m.mon.mean.nc plot File Metadata
U-wind Monthly Long Term Means 10 m uwnd.10m.mon.ltm.nc plot File Metadata
U-wind Monthly Ensemble Spreads 10 m uwnd.10m.mon.mean.nc plot File Metadata
U-wind Monthly Long Term Mean Ensemble Spreads 10 m uwnd.10m.mon.ltm.nc plot File Metadata
Momentum Flux, v-component Monthly Means Surface vflx.mon.mean.nc plot File Metadata
Momentum Flux, v-component Monthly Long Term Means Surface vflx.mon.ltm.nc plot File Metadata
Momentum Flux, v-component Monthly Ensemble Spreads Surface vflx.mon.mean.nc plot File Metadata
Momentum Flux, v-component Monthly Long Term Mean Ensemble Spreads Surface vflx.mon.ltm.nc plot File Metadata
Meridional Gravity Wave Stress Monthly Means Surface vgwd.mon.mean.nc plot File Metadata
Meridional Gravity Wave Stress Monthly Long Term Means Surface vgwd.mon.ltm.nc plot File Metadata
Meridional Gravity Wave Stress Monthly Ensemble Spreads Surface vgwd.mon.mean.nc plot File Metadata
Meridional Gravity Wave Stress Monthly Long Term Mean Ensemble Spreads Surface vgwd.mon.ltm.nc plot File Metadata
V-wind Monthly Means 10 m vwnd.10m.mon.mean.nc plot File Metadata
V-wind Monthly Long Term Means 10 m vwnd.10m.mon.ltm.nc plot File Metadata
V-wind Monthly Ensemble Spreads 10 m vwnd.10m.mon.mean.nc plot File Metadata
V-wind Monthly Long Term Mean Ensemble Spreads 10 m vwnd.10m.mon.ltm.nc plot File Metadata
Water Equiv. of Accum. Snow Depth Monthly Means Surface weasd.mon.mean.nc plot File Metadata
Water Equiv. of Accum. Snow Depth Monthly Long Term Means Surface weasd.mon.ltm.nc plot File Metadata
Water Equiv. of Accum. Snow Depth Monthly Ensemble Spreads Surface weasd.mon.mean.nc plot File Metadata
Water Equiv. of Accum. Snow Depth Monthly Long Term Mean Ensemble Spreads Surface weasd.mon.ltm.nc plot File Metadata

Related File Naming & Structure Information:

File Names:

  • 4-times daily /Datasets/20thC_ReanV2/Monthlies/monolevel/filename
  • 4-times daily /Datasets/20thC_ReanV2/Monthlies/monolevel_sprd/filename
  • 4-times daily /Datasets/20thC_ReanV2/Monthlies/gaussian/monolevel/filename
  • 4-times daily /Datasets/20thC_ReanV2/Monthlies/gaussian_sprd/monolevel/filename

Dataset Format and Size:

Missing Data:

  • Missing data is flagged with a value of 32767s or 9.36e36f..

OpenDap File Names:

  • http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Monthlies/monolevel/filename
  • http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Monthlies/monolevel_sprd/filename

FTP File Names:

  • ftp.cdc.noaa.gov/Datasets/20thC_ReanV2/Monthlies/monolevel/*
  • ftp.cdc.noaa.gov/Datasets/20thC_ReanV2/Monthlies/monolevel_sprd/*

Citation:

  • Please note: If you acquire 20th Century 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 20th Century 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 20th Century Reanalysis data set freely available online in the future. Thank you!
  • The Twentieth Century Reanalysis Project used resources of the National Energy Research Scientific Computing Center managed by Lawrence Berkeley National Laboratory and of the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory, which are supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and Contract No. DE-AC05-00OR22725, respectively.

    Papers using the Twentieth Century Reanalysis Project dataset are requested to include the following text in their acknowledgments: "Support for the Twentieth Century Reanalysis Project dataset is provided by the U.S. Department of Energy, Office of Science Innovative and Novel Computational Impact on Theory and Experiment (DOE INCITE) program, and Office of Biological and Environmental Research (BER), and by the National Oceanic and Atmospheric Administration Climate Program Office."

    • Compo, G.P., J.S. Whitaker, P.D. Sardeshmukh, N. Matsui, R.J. Allan, X. Yin, B.E. Gleason, R.S. Vose, G. Rutledge, P. Bessemoulin, S. Brönnimann, M. Brunet, R.I. Crouthamel, A.N. Grant, P.Y. Groisman, P.D. Jones, M. Kruk, A.C. Kruger, G.J. Marshall, M. Maugeri, H.Y. Mok, Ř. Nordli, T.F. Ross, R.M. Trigo, X.L. Wang, S.D. Woodruff, and S.J. Worley, 2011: The Twentieth Century Reanalysis Project. Quarterly J. Roy. Meteorol. Soc., 137, 1-28. DOI: 10.1002/qj.776 Free and Open Access.
    • Compo,G.P., J.S. Whitaker, and P.D. Sardeshmukh, 2006: Feasibility of a 100 year reanalysis using only surface pressure data. Bull. Amer. Met. Soc., 87, 175-190.
    • Whitaker, J.S., G.P.Compo, X. Wei, and T.M. Hamill 2004: Reanalysis without radiosondes using ensemble data assimilation. Mon. Wea. Rev., 132, 1190-1200.

References:

Original Source:

  • Data are Data are courtesy of Gilbert Compo1,2 , Jeff Whitaker2, and Prashant Sardeshmukh1,2 . University of Colorado CIRES-Climate Diagnostics Center 2. NOAA Earth System Research Laboratory - Physical Sciences Division.
  • The Twentieth Century Reanalysis Project used resources of the National Energy Research Scientific Computing Center managed by Lawrence Berkeley National Laboratory and of the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory, which are supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and Contract No. DE-AC05-00OR22725, respectively.

  • Papers using the Twentieth Century Reanalysis Project dataset are requested to include the following text in their acknowledgments: "Support for the Twentieth Century Reanalysis Project dataset is provided by the U.S. Department of Energy, Office of Science Innovative and Novel Computational Impact on Theory and Experiment (DOE INCITE) program, and Office of Biological and Environmental Research (BER), and by the National Oceanic and Atmospheric Administration Climate Program Office."

Other Sources:

Contact:

  • For help with the dataset please contact Gil Compo, Research Scientist, CIRES University of Colorado Email: compo@colorado.edu
  • Physical Sciences Division: Data Management
    NOAA/ESRL/PSD
    325 Broadway
    Boulder, CO 80305-3328
    esrl.psd.data@noaa.gov