Reprocessed GLDAS-2.0: Global Land Data Assimilation System

NASA/GLDAS/V20/NOAH/G025/T3H
Dataset Availability
1948-01-01T00:00:00 - 2010-12-31T00:00:00
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GLDAS/V20/NOAH/G025/T3H")
Tags
forcing wind temperature humidity geophysical soil moisture surface pressure radiation precipitation evaporation climate nasa ldas gldas 3-hourly

Description

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-2.0 is one of two components of the GLDAS Version 2 (GLDAS-2) dataset, the second being GLDAS-2.1. GLDAS-2.0 is reprocessed with the updated Princeton Global Meteorological Forcing Dataset (Sheffield et al., 2006) and upgraded Land Information System Version 7 (LIS-7). It covers the period 1948-2010, and will be extended to more recent years as corresponding forcing data become available.

The model simulation was initialized on January 1, 1948, using soil moisture and other state fields from the LSM climatology for that day of the year. The simulation used the common GLDAS datasets for land cover (MCD12Q1: Friedl et al., 2010), land water mask (MOD44W: Carroll et al., 2009), soil texture (Reynolds, 1999), and elevation (GTOPO30). The MODIS based land surface parameters are used in the current GLDAS-2.x products while the AVHRR base parameters were used in GLDAS-1 and previous GLDAS-2 products (prior to October 2012).

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
0.25 arc degrees

Bands

Name Units Min Max Description
Albedo_inst % 4.99* 82.25*

Albedo

AvgSurfT_inst K 194.55* 351.63*

Average surface skin temperature

CanopInt_inst kg/m^2 0* 0.5*

Plant canopy surface water

ECanop_tavg W/m^2 0* 671.88*

Canopy water evaporation

ESoil_tavg W/m^2 0* 592.64*

Direct evaporation from bare soil

Evap_tavg kg/m^2/s 0* 0.0002*

Evapotranspiration

LWdown_f_tavg W/m^2 44.62* 561.46*

Downward long-wave radiation flux

Lwnet_tavg W/m^2 -359.07* 130.59*

Net long-wave radiation flux

PotEvap_tavg W/m^2 -241.88* 1513.78*

Potential evaporation rate

Psurf_f_inst Pa 47824.1* 109036*

Pressure

Qair_f_inst kg/kg 0* 0.06*

Specific humidity

Qg_tavg W/m^2 -517.58* 485.13*

Heat flux

Qh_tavg W/m^2 -872.46* 797.71*

Sensible heat net flux

Qle_tavg W/m^2 -243.71* 716.69*

Latent heat net flux

Qs_acc kg/m^2 0* 131.39*

Storm surface runoff

Qsb_acc kg/m^2 0* 42.3*

Baseflow-groundwater runoff

Qsm_acc kg/m^2 0* 27.58*

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* 943.52*

Root zone soil moisture

SWE_inst kg/m^2 0* 117284*

Snow depth water equivalent

SWdown_f_tavg W/m^2 0* 1329.22*

Downward short-wave radiation flux

SnowDepth_inst m 0* 293.2*

Snow depth

Snowf_tavg kg/m^2/s 0* 0.004*

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 218.75* 329.55*

Soil temperature

SoilTMP10_40cm_inst K 227.3* 317.08*

Soil temperature

SoilTMP40_100cm_inst K 232.59* 313.47*

Soil temperature

SoilTMP100_200cm_inst K 234.5* 311.86*

Soil temperature

Swnet_tavg W/m^2 0* 1128.86*

Net short wave radiation flux

Tair_f_inst K 197.03* 326.2*

Air temperature

Tveg_tavg W/m^2 0* 611.89*

Transpiration

Wind_f_inst m/s 0.06* 30.31*

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/V20/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, 0);
Map.addLayer(
    averageSurfaceSkinTemperatureK, averageSurfaceSkinTemperatureKVis,
    'Average Surface Skin Temperature [K]');

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