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.
| Name | Description | Gee Unit |
|---|---|---|
| Albedo_inst | Albedo | % |
| AvgSurfT_inst | Average surface skin temperature | K |
| CanopInt_inst | Plant canopy surface water | kg/m^2 |
| ECanop_tavg | Canopy water evaporation | W/m^2 |
| ESoil_tavg | Direct evaporation from bare soil | W/m^2 |
| Evap_tavg | Evapotranspiration | kg/m^2/s |
| LWdown_f_tavg | Downward long-wave radiation flux | W/m^2 |
| Lwnet_tavg | Net long-wave radiation flux | W/m^2 |
| PotEvap_tavg | Potential evaporation rate | W/m^2 |
| Psurf_f_inst | Pressure | Pa |
| Qair_f_inst | Specific humidity | kg/kg |
| Qg_tavg | Heat flux | W/m^2 |
| Qh_tavg | Sensible heat net flux | W/m^2 |
| Qle_tavg | Latent heat net flux | W/m^2 |
| Qs_acc | Storm surface runoff | kg/m^2 |
| Qsb_acc | Baseflow-groundwater runoff | kg/m^2 |
| Qsm_acc | Snow melt | kg/m^2 |
| Rainf_f_tavg | Total precipitation rate | kg/m^2/s |
| Rainf_tavg | Rain precipitation rate | kg/m^2/s |
| RootMoist_inst | Root zone soil moisture | kg/m^2 |
| SWE_inst | Snow depth water equivalent | kg/m^2 |
| SWdown_f_tavg | Downward short-wave radiation flux | W/m^2 |
| SnowDepth_inst | Snow depth | m |
| Snowf_tavg | Snow precipitation rate | kg/m^2/s |
| SoilMoi0_10cm_inst | Soil moisture | kg/m^2 |
| SoilMoi10_40cm_inst | Soil moisture | kg/m^2 |
| SoilMoi40_100cm_inst | Soil moisture | kg/m^2 |
| SoilMoi100_200cm_inst | Soil moisture | kg/m^2 |
| SoilTMP0_10cm_inst | Soil temperature | K |
| SoilTMP10_40cm_inst | Soil temperature | K |
| SoilTMP40_100cm_inst | Soil temperature | K |
| SoilTMP100_200cm_inst | Soil temperature | K |
| Swnet_tavg | Net short wave radiation flux | W/m^2 |
| Tair_f_inst | Air temperature | K |
| Tveg_tavg | Transpiration | W/m^2 |
| Wind_f_inst | Wind speed | m/s |
Providers | |
|---|---|
| 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"} |