GLDAS-2.1: Global Land Data Assimilation System (NASA/GLDAS/V021/NOAH/G025/T3H)

Version V021

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.

NameDescriptionGee Unit
AvgSurfT_instAverage surface skin temperatureK
CanopInt_instPlant canopy surface waterkg/m^2
ECanop_tavgCanopy water evaporationW/m^2
ESoil_tavgDirect evaporation from bare soilW/m^2
LWdown_f_tavgDownward long-wave radiation fluxW/m^2
Lwnet_tavgNet long-wave radiation fluxW/m^2
PotEvap_tavgPotential evaporation rateW/m^2
Qair_f_instSpecific humiditykg/kg
Qg_tavgHeat fluxW/m^2
Qh_tavgSensible heat net fluxW/m^2
Qle_tavgLatent heat net fluxW/m^2
Qs_accStorm surface runoffkg/m^2
Qsb_accBaseflow-groundwater runoffkg/m^2
Qsm_accSnow meltkg/m^2
Rainf_f_tavgTotal precipitation ratekg/m^2/s
Rainf_tavgRain precipitation ratekg/m^2/s
RootMoist_instRoot zone soil moisturekg/m^2
SWE_instSnow depth water equivalentkg/m^2
SWdown_f_tavgDownward short-wave radiation fluxW/m^2
SnowDepth_instSnow depthm
Snowf_tavgSnow precipitation ratekg/m^2/s
SoilMoi0_10cm_instSoil moisturekg/m^2
SoilMoi10_40cm_instSoil moisturekg/m^2
SoilMoi40_100cm_instSoil moisturekg/m^2
SoilMoi100_200cm_instSoil moisturekg/m^2
SoilTMP0_10cm_instSoil temperatureK
SoilTMP10_40cm_instSoil temperatureK
SoilTMP40_100cm_instSoil temperatureK
SoilTMP100_200cm_instSoil temperatureK
Swnet_tavgNet short wave radiation fluxW/m^2
Tair_f_instAir temperatureK
Wind_f_instWind speedm/s


NASA (producer, licensor)
Google Earth Engine (host)
STAC Version 0.6.0
Keywords 3-hourly, climate, evaporation, forcing, geophysical, gldas, humidity, ldas, moisture, nasa, precipitation, pressure, radiation, soil, surface, temperature, wind
License proprietary
Temporal Extent 12/31/1999, 4:00:00 PM - now
Citation 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.
Type image_collection
GSD arc degreesm
Cadence hours
Asset schema {"name":"end_hour","description":"End hour","type":"DOUBLE"},{"name":"start_hour","description":"Start hour","type":"DOUBLE"}