Reprocessed GLDAS-2: Global Land Data Assimilation System (NASA/GLDAS/V20/NOAH/G025/T3H)
Version V20
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).
| 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 | 12/31/1947, 4:00:00 PM - 12/30/2010, 4:00:00 PM |
| 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"} |