GLDAS-2.1: Global Land Data Assimilation System

NASA/GLDAS/V021/NOAH/G025/T3H
Dataset Availability
2000-01-01T03:00:00Z–2023-05-10T21:00:00
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GLDAS/V021/NOAH/G025/T3H")
Tags
3-hourly climate evaporation forcing geophysical gldas humidity ldas nasa precipitation pressure radiation soil soil-moisture surface temperature wind

Description

NASA Global Land Data Assimilation System Version 2 (GLDAS-2) has three components: GLDAS-2.0, GLDAS-2.1, and GLDAS-2.2. GLDAS-2.0 is forced entirely with the Princeton meteorological forcing input data and provides a temporally consistent series from 1948 through 2014. GLDAS-2.1 is forced with a combination of model and observation data from 2000 to present. GLDAS-2.2 product suites use data assimilation (DA), whereas the GLDAS-2.0 and GLDAS-2.1 products are "open-loop" (i.e., no data assimilation). The choice of forcing data, as well as DA observation source, variable, and scheme, vary for different GLDAS-2.2 products.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.

Documentation:

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.

Bands

Resolution
27830 meters

Bands

Name Units Min Max Description
Albedo_inst % 4.99* 82.25*

Albedo
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*

Evapotranspiration
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*

Pressure
Qair_f_inst 1 (mass fraction) -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*

Transpiration
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.

Citations

Citations:

  • 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(ee.Filter.date('2010-06-01', '2010-06-02'));
var averageSurfaceSkinTemperatureK = dataset.select('AvgSurfT_inst');
var averageSurfaceSkinTemperatureKVis = {
  min: 250.0,
  max: 300.0,
  palette: ['1303ff', '42fff6', 'f3ff40', 'ff5d0f'],
};
Map.setCenter(71.72, 52.48, 3.0);
Map.addLayer(
    averageSurfaceSkinTemperatureK, averageSurfaceSkinTemperatureKVis,
    'Average Surface Skin Temperature [K]');
NASA Global Land Data Assimilation System Version 2 (GLDAS-2) has three components: GLDAS-2.0, GLDAS-2.1, and GLDAS-2.2. GLDAS-2.0 is forced entirely with the Princeton meteorological forcing input data and provides a temporally consistent series from 1948 through 2014. GLDAS-2.1 is forced with a combination of model and observation data from 2000 …
NASA/GLDAS/V021/NOAH/G025/T3H, 3-hourly,climate,evaporation,forcing,geophysical,gldas,humidity,ldas,nasa,precipitation,pressure,radiation,soil,soil-moisture,surface,temperature,wind
2000-01-01T03:00:00Z/2023-05-10T21:00:00
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