NCEP/NCAR Reanalysis (R1) Sigma Level Data

SOURCE: Data Support Section Dataset ds090.0

DATA DESCRIPTION: NCEP/NCAR R1 reanalysis model (sigma) level daily data, regridded from 2.5 degree grid.


FORMAT: CCM2 History Tape (Jan 1979 - Dec 1996); NetCDF (Jan 1997 - current)

GRID: Global - T63 Gaussian (192 x 96)

LEVELS: (28 Sigma levels)


TIMES: 4 times daily: 00Z, 06Z, 12Z, 18Z.

CURRENT HOLDINGS: Jan 1979 - Dec 2009


Description Name Units Levels
Zonal wind component U m s-1 all
Meridional wind component V m s-1 all
Temperature T K all
Specific humidity Q kg kg-1 all*
Surface pressure PS Pa surface
Surface geopotential PHIS m2 s-2 surface

*Values above 0.1682 do not appear to be reliable.

MSS Directory: /CA/NMC/SIGMA/

/CA/NMC/SIGMA/UPDATE/ (after March 1997)

Filename: Prior to 1997: T63yymmdd where yy=year, mm=month, dd=day=01,04,07,10,13,16,19,22,25,28, or 31; 3 days (12 time steps) per volume (though not always for end of month).

e.g. T63850101 contains data for 85,01,01,00Z through 85,01,03,18Z.

Filenames for holdings beginning January 1997 contain a four-digit year, one day per file, and have the file tag ".nc".

e.g. contains data for 00Z, 06Z, 12Z, and 18Z on
January 1, 1997 in NetCDF format.

Related Software: Code to convert CCM format to NetCDF (ccm2nc)

Other Products related to this Dataset: