Global Data Assimilation System (GDAS)

Description

The Global Data Assimilation System (GDAS) is the system used by the Global Forecast System (GFS) model to place observations into a gridded model space for the purpose of starting, or initializing, weather forecasts with observed data. GDAS adds the following types of observations to a gridded, 3-D, model space: surface observations, balloon data, wind profiler data, aircraft reports, buoy observations, radar observations, and satellite observations. GDAS data are available as both input observations to GDAS and gridded output fields from GDAS. Gridded GDAS output data can be used to start the GFS model. Due to the diverse nature of the assimilated data types, input data are available in a variety of data formats, primarily Binary Universal Form for the Representation of meteorological data (BUFR) and Institute of Electrical and Electronics Engineers (IEEE) binary. The GDAS output is World Meteorological Organization (WMO) Gridded Binary (GRIB).

Resources

Name Format Description Link
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
0 Description of the data and related resources. https://www.ncei.noaa.gov/products/weather-climate-models/global-data-assimilation
0 Direct download for the dataset. https://www.ncei.noaa.gov/data/ncep-global-data-assimilation/access/
0 Select and order files in the offline archive. https://www.ncei.noaa.gov/has/HAS.FileAppRouter?datasetname=GDAS_DyBuf&subqueryby=STATION&applname=&outdest=FILE
0 Select and order files in the offline archive. https://www.ncei.noaa.gov/has/HAS.FileAppRouter?datasetname=GDAS_Hrly&subqueryby=STATION&applname=&outdest=FILE
0 Select and order files in the offline archive. https://www.ncei.noaa.gov/has/HAS.FileAppRouter?datasetname=GDAS_Dy&subqueryby=STATION&applname=&outdest=FILE
0 Web site providing overview and technical documentation for the GDAS. http://www.emc.ncep.noaa.gov/gmb/gdas/
0 NCEI home page with information, data access and contact information. https://www.ncei.noaa.gov
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
0 Web site providing overview and technical documentation for the GDAS. http://www.emc.ncep.noaa.gov/gmb/gdas/
0 Landing page for the dataset. https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc:C00379/html
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords

Tags

  • humidity
  • ice pellets
  • vertical location
  • tropospheric/high-level clouds (observed/analyzed)
  • terrestrial hydrosphere
  • dew point temperature
  • nomads
  • precipitation
  • tropopause
  • water vapor profiles
  • sea surface
  • incoming solar radiation
  • land surface
  • altitude
  • soils
  • national climatic data center
  • atmospheric temperature
  • nesdis
  • sea surface temperature
  • tropospheric/low level clouds (observed/analyzed)
  • wind dynamics
  • boundary layer temperature
  • precipitation amount
  • snow cover
  • oceans
  • surface winds
  • water vapor
  • vegetation index
  • snow
  • the noaa operational model archive and distribution system
  • water vapor processes
  • sea level pressure
  • atmospheric water vapor
  • atmosphere
  • noaa
  • air temperature
  • total precipitable water
  • ocean temperature
  • longwave radiation
  • global
  • evaporation
  • troposphere
  • snow depth
  • inversion height
  • vertical profiles
  • planetary boundary layer height
  • u.s. department of commerce
  • land use/land cover
  • earth science
  • rain
  • geographic region
  • radiative flux
  • sea ice
  • surface pressure
  • potential temperature
  • solar radiation
  • doc/noaa/nesdis/ncei
  • shortwave radiation
  • convection
  • atmospheric pressure measurements
  • skin temperature
  • boundary layer winds
  • snow/ice
  • atmospheric radiation
  • sea ice concentration
  • atmospheric stability
  • wind shear
  • tropospheric/mid-level clouds (observed/analyzed)
  • wind profiles
  • vertical wind velocity/speed
  • solid precipitation
  • upper level winds
  • pressure thickness
  • liquid precipitation
  • atmospheric pressure
  • surface radiative properties
  • doc/noaa/nesdis/ncdc
  • sleet
  • clouds
  • boundary layer
  • soil temperature
  • flight level winds
  • atmospheric winds
  • vorticity
  • geopotential height
  • precipitation rate
  • soil moisture/water content
  • land cover
  • surface temperature
  • albedo
  • upper air temperature
  • freezing rain
  • water vapor indicators
  • national centers for environmental information
  • stratosphere
  • land use/land cover classification

Topics

  • Climate

Categories

  • Arctic
  • Arctic Weather and Extreme Events