NCEP/NCAR R1 daily pressure level data

SOURCE: Data Support Section Dataset ds090.0

DATA DESCRIPTION: R1 reanalysis pressure level daily data, regridded from 2.5 degree grid.

UPDATED THROUGH: Dec 2009

FORMAT: NetCDF (Jan 1948 - Dec 1957; Jan 1979 - present); CCM2 History Tape (Jan 1979 - Dec 1996)

GRID: Global - T42 Gaussian (128 x 64)

LEVELS: (Pressure, hPa) 1000,925,850,700,600,500,400,300,250,200,150,100,70,50,30,20,10

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

CURRENT HOLDINGS: January 1979 - December 2009

FIELDS:

Description Name Units Levels Notes
Zonal wind component U m s-1 all  
Meridional wind component V m s-1 all  
Vertical pressure velocity OMEGA Pa s-1 lowest 12*  
Geopotential height ZA m all  
Temperature T K all  
Relative humidity RH % lowest 8* 0<=RH<=100
Specific humidity Q kg kg-1 lowest 8* Q>=0
Surface pressure PS Pa surface  
Sea level pressure SLP Pa msl  
Surface geopotential PHIS m2 s-2 surface  
Precipitable water PWAT kg m-2 column PWAT>=0

* Remaining (higher) levels are filled with 1.E36

MSS Directory: /CA/NMC/PRESS/ (NetCDF files: Jan 1948 - Dec 1957, Jan 1979-Dec 1996) (CCM2 files : January 1979 - December 1996)

/CA/NMC/PRESS/UPDATE/ (NetCDF files: January 1997 - present)

Filename: For files in /CA/NMC/PRESS:

CCM2 files: T42yymmdd 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. /CA/NMC/PRESS/T42850101 contains data for 85,01,01,00Z through 85,01,03,18Z.

NetCDF files: T42yyyymmdd.nc where yyyy = year, mm = month, dd=day
One day per file.

e.g. T4219510101.nc for January 01, 1951.

For files in /CA/NMC/PRESS/UPDATE: T42yyyymmdd.nc where yyyy = year, mm = month, dd=day One day per file. e.g. T4219970101.nc contains data for 00Z, 06Z, 12Z, and 18Z on January 01, 1997 in NetCDF format.


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