GDAS_0ZF_Collection 4 and 5

One degree Global Data Assimilation System Data from NOAA/NCEP (MODIS Ancillary Data)

Version Collection 4 and 5 eng
  • Abstract
    The National Weather Service's National Centers for Environmental Prediction (NCEP) runs a series of computer analyses and forecasts operationally. One of the operational systems is the Global Data Assimilation System (GDAS, Kanamitsu, 1989), which uses the spectral Medium Range Forecast model (MRF) for the forecast. Another system is the Eta Data Assimilation System (EDAS), covering the U.S. At NOAA's Air Resources Laboratory (ARL), NCEP model output is used for air quality transport and dispersion modeling. ARL archives both EDAS and GDAS data using a 1-byte packing method. Both archives contain basic fields such as the u- and v-wind components, temperature, and humidity. However, the archives differ from each other because of the horizontal and vertical resolution, as well as in the specific fields, provided by NCEP. ORIGIN OF THE DATA The 6-hourly archive data come from NCEP's GDAS. The GDAS is the final run in the series of NCEP operational model runs; it therefore is known as the Final Run at NCEP and includes late arriving conventional and satellite data. It is run 4 times a day, ie, at 00, 06, 12, and 18 UTC. Model output is for the analysis time and a 6-hour forecast. Some fields such as precipitation and surface fluxes are only available at the forecast time. Details of the GDAS are described by Kanamitsu (1989), Derber et al. (1991), and Parrish and Derber (1992). NCEP post-processing of the GDAS converts the data from spectral coefficient form to 1 degree latitude-longitude (360 by 181) grids and from sigma levels to mandatory pressure levels. Surface and upper level FNL data are output on the following mandatory pressure surfaces: 1000, 925, 850, 700, 500, 400, 300, 250, 200, 150, 100, 50, and 20 hPa. These data are written to the NIC (NOAA Information Center) FTP server (nic.fb4.noaa.gov) in GRIB (GRIdded Binary) format Data set information: http://modis.gsfc.nasa.gov/sci_team/
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    Science Keywords
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • INFRARED RADIANCE
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • MICROWAVE
    • MICROWAVE RADIANCE
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • ULTRAVIOLET WAVELENGTHS
    • ULTRAVIOLET RADIANCE
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Ancillary Keywords
  • EOSDIS
ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Acquisition Information Fields:

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    • MODIS
  • TERRA
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  • AQUA
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Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • NASA/GSFC/SED/ESD/HBSL/BISB/LAADS
    ARCHIVER
    L1 and Atmosphere Archive and Distribution System,Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

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  • Technical Contact
    LAADS USER SUPPORT TEAM

    LAADS User Support Team
    NASA/GSFC
    Mail Code: 619
    Greenbelt, MD 20771

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    • 1-800-596-8132
    • 301-794-7035
  • GANG
    Metadata Author
    GANG YE, PH.D

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  • Data Center Contact
    LAADS USER SUPPORT TEAM

    NASA/GSFC/SED/ESD/HBSL/BISB/LAADS

    LAADS User Support Team
    NASA/GSFC
    Mail Code: 619
    Greenbelt, MD 20771

    • Email
    • 1-800-596-8132
    • 301-794-7035

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