GLDAS-2.1: Global Land Data Assimilation System

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3-hourly climate evaporation forcing geophysical gldas humidity ldas moisture nasa precipitation pressure radiation soil surface temperature wind


Global Land Data Assimilation System (GLDAS) ingests satellite and ground-based observational data products. Using advanced land surface modeling and data assimilation techniques, it generates optimal fields of land surface states and fluxes.

GLDAS-2.1 is one of two components of the GLDAS Version 2 (GLDAS-2) dataset, the second being GLDAS-2.0. GLDAS-2.1 is analogous to GLDAS-1 product stream, with upgraded models forced by a combination of GDAS, disaggregated GPCP, and AGRMET radiation data sets.

The GLDAS-2.1 simulation started on January 1, 2000 using the conditions from the GLDAS-2.0 simulation. This simulation was forced with National Oceanic and Atmospheric Administration (NOAA)/Global Data Assimilation System (GDAS) atmospheric analysis fields (Derber et al., 1991), the disaggregated Global Precipitation Climatology Project (GPCP) precipitation fields (Adler et al., 2003), and the Air Force Weather Agency's AGRicultural METeorological modeling system (AGRMET) radiation fields which became available for March 1, 2001 onwards.


Provider's Note: the names with extension _tavg are variables averaged over the past 3-hours, the names with extension '_acc' are variables accumulated over the past 3-hours, the names with extension '_inst' are instantaneous variables, and the names with '_f' are forcing variables.


27830 meters


Name Units Min Max Description
Albedo_inst % 4.99* 82.25*


AvgSurfT_inst K 187.48* 1323.35*

Average surface skin temperature

CanopInt_inst kg/m^2 0* 0.5*

Plant canopy surface water

ECanop_tavg W/m^2 0* 1273.66*

Canopy water evaporation

ESoil_tavg W/m^2 0* 2275.63*

Direct evaporation from bare soil

Evap_tavg kg/m^2/s 0* 0.002*


LWdown_f_tavg W/m^2 26.85* 600.9*

Downward long-wave radiation flux

Lwnet_tavg W/m^2 -13792.7* 196.97*

Net long-wave radiation flux

PotEvap_tavg W/m^2 -227.75* 18977.9*

Potential evaporation rate

Psurf_f_inst Pa 44063.1* 108344*


Qair_f_inst kg/kg -0.02* 0.07*

Specific humidity

Qg_tavg W/m^2 -552.64* 1538.41*

Heat flux

Qh_tavg W/m^2 -1005.15* 18190.6*

Sensible heat net flux

Qle_tavg W/m^2 -227.75* 5072.25*

Latent heat net flux

Qs_acc kg/m^2 0* 170.93*

Storm surface runoff

Qsb_acc kg/m^2 0* 50.6*

Baseflow-groundwater runoff

Qsm_acc kg/m^2 0* 42.87*

Snow melt

Rainf_f_tavg kg/m^2/s 0* 0.01*

Total precipitation rate

Rainf_tavg kg/m^2/s 0* 0.01*

Rain precipitation rate

RootMoist_inst kg/m^2 2* 949.6*

Root zone soil moisture

SWE_inst kg/m^2 0* 120787*

Snow depth water equivalent

SWdown_f_tavg W/m^2 -56.93* 30462.8*

Downward short-wave radiation flux

SnowDepth_inst m 0* 301.96*

Snow depth

Snowf_tavg kg/m^2/s 0* 0.009*

Snow precipitation rate

SoilMoi0_10cm_inst kg/m^2 1.99* 47.59*

Soil moisture

SoilMoi10_40cm_inst kg/m^2 5.99* 142.8*

Soil moisture

SoilMoi40_100cm_inst kg/m^2 11.99* 285.6*

Soil moisture

SoilMoi100_200cm_inst kg/m^2 20* 476*

Soil moisture

SoilTMP0_10cm_inst K 221.98* 377.5*

Soil temperature

SoilTMP10_40cm_inst K 227.43* 319.44*

Soil temperature

SoilTMP40_100cm_inst K 232.97* 316.2*

Soil temperature

SoilTMP100_200cm_inst K 238.52* 314.11*

Soil temperature

Swnet_tavg W/m^2 -48.96* 23741.3*

Net short wave radiation flux

Tair_f_inst K 206.8* 327.66*

Air temperature

Tveg_tavg W/m^2 0* 3455.14*


Wind_f_inst m/s 0* 57.7*

Wind speed

* estimated min or max value

Image Properties

Image Properties

Name Type Description
end_hour DOUBLE

End hour

start_hour DOUBLE

Start hour

Terms of Use

Terms of Use

Distribution of data from the Goddard Earth Sciences Data and Information Services Center (GES DISC) is funded by NASA's Science Mission Directorate (SMD). Consistent with NASA Earth Science Data and Information Policy, data from the GES DISC archive are available free to the user community. For more information visit the GES DISC Data Policy page.


  • Rodell, M., P.R. Houser, U. Jambor, J. Gottschalck, K. Mitchell, C.-J. Meng, K. Arsenault, B. Cosgrove, J. Radakovich, M. Bosilovich, J.K. Entin, J.P. Walker, D. Lohmann, and D. Toll, The Global Land Data Assimilation System, Bull. Amer. Meteor. Soc., 85(3), 381-394, 2004.

  • Additional references

Explore in Earth Engine

var dataset = ee.ImageCollection('NASA/GLDAS/V021/NOAH/G025/T3H')
                  .filter('2010-06-01', '2010-06-02'));
var averageSurfaceSkinTemperatureK ='AvgSurfT_inst');
var averageSurfaceSkinTemperatureKVis = {
  min: 250.0,
  max: 300.0,
  palette: ['1303ff', '42fff6', 'f3ff40', 'ff5d0f'],
Map.setCenter(71.72, 52.48, 3.0);
    averageSurfaceSkinTemperatureK, averageSurfaceSkinTemperatureKVis,
    'Average Surface Skin Temperature [K]');