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NOAA CIRES Twentieth Century Global Reanalysis Version 2

| DOI: 10.5065/D6QR4V37

This historical dataset is recommended for ancillary use only and not as a primary research dataset. It has likely been superseded by a newer, improved dataset.


The Twentieth Century Reanalysis Project, supported by the Earth System Research Laboratory Physical Sciences Division from NOAA and the University of Colorado CIRES Climate Diagnostics Center, is an effort to produce a global reanalysis dataset spanning a portion of the nineteenth century and the entire twentieth century (1871 - near present), assimilating only surface observations of synoptic pressure, monthly sea surface temperature and sea ice distribution. Products include 6-hourly ensemble mean and spread analysis fields on a 2 by 2 degree global latitude-longitude grid, and 3 and 6-hourly ensemble mean and spread forecast (first guess) fields on a global Gaussian T62 grid. Fields are accessible in yearly time series (1 file per parameter) and monthly synoptic time (all parameters per synoptic hour) files. Ensemble grids, spectral coefficients, and other information will available by offline request in the future.

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.

Note: Version 2c of this reanalysis (running from 1851 - 2011) is the recommended research version. Please see ds131.2 to access Version 2c.


RELEASE POLICY: Please use the citations listed below (See Publications section below) in any submitted publications using this dataset.

Additionally, papers using the Twentieth Century Reanalysis Project dataset are requested to include the following text in their acknowledgements:

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.

Temporal Range:
1869-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (Entire dataset) Period details by dataset product
Air Temperature Albedo Cloud Base Pressure Cloud Frequency
Cloud Liquid Water/Ice Cloud Top Pressure Convection Evaporation
Evapotranspiration Geopotential Height Gravity Wave Heat Flux
Humidity Ice Depth/Thickness Ice Extent Land Use/Land Cover Classification
Longwave Radiation Maximum/Minimum Temperature Planetary Boundary Layer Height Potential Temperature
Precipitation Rate Runoff Sea Level Pressure Sea Surface Temperature
Shortwave Radiation Skin Temperature Snow Cover Snow Depth
Snow Water Equivalent Soil Moisture/Water Content Surface Pressure Surface Roughness
Surface Winds Total Precipitable Water Tropopause Tropospheric Ozone
Upper Air Temperature Upper Level Winds Vegetation Cover Vegetation Species
Vertical Wind Velocity/Speed
Data Contributors:
Cooperative Institute for Research in Environmental Sciences, University of Colorado
Physical Sciences Laboratory, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce
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. Bronnimann, M. Brunet, R.I. Crouthamel, A.N. Grant, P.Y. Groisman, P.D. Jones, M.C. Kruk, A.C. Kruger, G.J. Marshall, M. Maugeri, H.Y. Mok, O. Nordli, T.F. Ross, R.M. Trigo, X.L. Wang, S.D. Woodruff, S.J. Worley, 2011: The Twentieth Century Reanalysis Project Quarterly J. Roy. Met. Soc., 137, 1-28 (DOI: 10.1002/qj.776).

G.P. Compo, J.S. Whitaker, and P.D. Sardeshmukh, 2008: The 20th Century Reanalysis Project. Proceedings of the Proceedings of the Third WCRP International Conference on Reanalysis, 28 January - 1 February 2008, WCRP, The University of Tokyo Japan..

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.

Total Volume:
13.61 TB (Entire dataset) Volume details by dataset product
Data Formats:
Related RDA Datasets:
NCEP/NCAR Global Reanalysis Products, 1948-continuing
NCEP/DOE Reanalysis 2 (R2)
ERA-15 Global Surface Reanalysis
ERA40 T85 6-hourly Surface Analysis and Surface Forecast Fields, created at NCAR
ERA40 T85 Monthly Mean Surface Analysis and Surface Forecast Fields, created at NCAR
NOAA/CIRES Twentieth Century Global Reanalysis Version 2c
International Surface Pressure Databank (ISPDv2)
NCEP North American Regional Reanalysis (NARR)
Japanese 25-year Reanalysis Project
ERA-Interim Project
More Details:
View a more detailed summary of the data, including specific date ranges and locations by parameter
Metadata Record:
Data License:
Citation counts are compiled through information provided by publicly-accessible APIs according to the guidelines developed through the project. If journals do not provide citation information to these publicly-accessible services, then this citation information will not be included in RDA citation counts. Additionally citations that include dataset DOIs are the only types included in these counts, so legacy citations without DOIs, references found in publication acknowledgements, or references to a related publication that describes a dataset will not be included in these counts.