DecVar Data

Data

Data Type: Model-assimilated data

Atmosphere

NCEP/NCAR Global Reanalysis Products, 6-hrly, monthly

This data set contains products from the NCEP/NCAR Reanalysis Project. The resolution of the Reanalysis Model is T62 (209 km) with 28 vertical sigma levels. Most output fields are saved 4 times a day. The plan is to reanalyze the data for a 40-year period, between 1957-1996 and to continuously update the analyses to keep them current. Plans also call for rerunning the the entire period every few years. The output products include over 80 different variables and several different coordinate systems. The coordinate systems are a pressure level stack (17 levels) on a 2.5x2.5 degree lat-lon grid, a sigma level stack (28 levels) on Gaussian 192x94 grid, and a theta surface stack (11 levels) on a 2.5x2.5 degree lat-lon grid. This archive includes analyses and first guess fields.
The observations used as input to the analysis are also part of this archive. Forecast fields are available in ds090.1. Most of the analysis, first guess and forecast fields are archived in WMO GRIB format. Observations are archived in WMO BUFR format. The collection is organized in subsets where subsets are defined by groups of variables/levels on the same coordinate are stored. Some special periods will be analyzed more than once to provide data for special research studies. For example, a special NOSAT run of 1979 was made excluding most satellite inputs. This run could be used for evaluating the impact of satellite data on the analysis. During TOGA-COARE experiment period, special runs of reanalysis model without (NOEXP) experimental data are archived under TOGA-COARE directory. Extensive documentation on the content, access, status and known problem areas of the Reanalysis archive is available from the DSS ftp/web site.
PERIODS: 1948jan01-2000dec31 \ continuing See Summary Table for details.
UPDATES: irregular intervals
USAGE: Public domain, but not in our mainstream files (no MSS-file-list here), contact specialist for help.
VARIABLES: geopotential height, temperature, u wind component, v wind component, vertical motion, relative humidity, divergence, vorticity, potential temperature, precipitable water, surface pressure, sea level pressure, tropopause pressure, tropopause temperature, wind shear, surface boundary layer, surface geopotential, specific humidity, u wind component at 10 meters, v wind component at 10 meters, temperature at 2 m, roughness, river runoff, cloud cover, high cloud cover, medium cloud cover, low cloud cover, height of cloud base, longwav shortwave radiation, latitudinal component of gravity wave stress, water equivalent of snow depth, soil moisture, latent heat, sensible heat many more variables in different subgroups, detailed lists are in variable lists
LEVELS: 1000mb 925mb 850mb 700mb 600mb 500mb 400mb 300mb 250mb 200mb 150mb 100mb 70mb 50mb 30mb 20mb 10mb 17 pressure levels (in pgb.f00 subgroup) 0.9950 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 0.3720 0.3125 0.25
TYPES: analyses gridded analyses
COVERAGE: global coverage
COST: The complete dataset is not free. It is only available from the NCAR MSS. Only users with NCAR computing accounts may download it without charge from DSS. For all others, DSS standard pricing applies. If the user will accept unfiltered copies of whole fil
SOURCES: National Centers for Environmental Prediction (NCEP - prior to 1995, NMC) Bob Kistler
PUBLICATIONS: Kalnay, et al;The NCEP/NCAR 40-Year Reanalysis Project; Bulletin of the American Meteorological Society; Vol. 77 No. 3, March 1996. Kalnay, et al;The NCEP/NCAR 50-Year Reanalysis (submitted to BAMS, June 1999. See here
VOLUME: about 55GB/year, 2783.8GB total as of 2001jan17, 48.965 GB total in 1979NOSAT archive as of 1996sep12.
FORMAT: NMC OFFICE NOTE 401, GRIB1 Edition 1, BUFR A little advice is available for: MM5 users...
CONTACT: For assistance with this dataset, please contact Chi-Fan Shih (303-497-1833) or Dennis Joseph (303-497-1216) . If the specialist is unavailable, please contact Data Help or call 303-497-1219.
RELATED SITES: see NCEP/NCAR Reanalysis for details.
URL: http://dss.ucar.edu/datasets/ds090.0/

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