NCEP/NCAR Reanalysis (R1) monthly model (sigma) level data

SOURCE: Data Support Section Dataset ds090.0 From the 'grbsanl' file. T62 gaussian grid.

DATA DESCRIPTION:NCEP/NCAR R1 Monthly means and statistics computed from the 4-times daily data.

UPDATED THROUGH: Dec 2009

FORMAT: CCM2 History Tape (Feb 1979 - Nov 1996) ; netCDF (Dec 1996 - current)

GRID: Global - T63 Gaussian (192 x 96)

LEVELS: (28 Sigma levels)

.9950,.9821,.9644,.9425,.9159,.8838,.8458,.8014,.7508,.6943,
.6329,.5681,.5017,.4357,.3720,.3125,.2582,.2101,.1682,.1326,
.1028,.0782,.0580,.0418,.0288,.0183,.0101,.0027

TIMES: One mean per month

CURRENT HOLDINGS: Feb 1979 - Dec 2009

FIELDS:

Description Name Units Levels
Zonal wind component U m s-1 all
Meridional wind component V m s-1 all
Relative vorticity VOR s-1 all
Relative divergence DIV s-1 all
Vertical pressure velocity OMEGA Pa s-1 all
Geopotential height ZA m all
Temperature T K all
Relative humidity RH % all*
Specific humidity Q kg kg-1 all*
Surface pressure PS Pa surface
Sea level pressure SLP Pa msl
Surface geopotential PHIS m2 s-2 surface
Horizontal wind speed VMAG m s-1 all
Specific Kinetic Energy KE J kg-1 all
Zonal wind tendency DU m s-1 s-1 all
Meridional wind tendency DV m s-1 s-1 all
Temperature tendency DT K s-1 all
Specific humidity tendency DQ kg kg-1 s-1 all*
Surface pressure tendency DPS Pa s-1 surface

*Values above 0.1682 do not appear to be reliable

Plus the following variances and covariances:
UUP, VVP, WWP, TTP, QQP, PSP, VORP, DIVP, ZZP, SLPP, RHP
UTP, VTP, UQP, VQP, UZP, VZP, UVP, UVORP, VVORP, UWP, VWP, WQP, WTP, WZP

SPECIAL NOTE: Beginning December 1996 the data files also include variances and covariances for each time of day (00z, 06z, 12z, and 18z) in addition to the total variances and covariances.

MSS Directory: /CA/NMC/SIGMA/

/CA/NMC/SIGMA/UPDATE/

Filename: T63yymmM where yy=year, mm=month, one month per volume. Newer netCDF files (from Dec 1996++) include a ".nc" file tag and a four-digit year (e.g. T63199812M.nc)

e.g. T638501M for January 1985.


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


Other Products related to this Dataset: