Specifications

GLDAS currently can run with the following specifications and improvements such as additional datasets (forcing and near surface), new land surface models, and algorithms are ongoing in the project.

Projection LatLong
Spatial Extent All land north of 60 degrees S
Spatial Resolution 1 degree and 1/4 degree
Time Period 1/1/1979 - present
Temporal Resolution 15 minute time steps, 3-hourly output fields
Forcing Multiple datasets derived from satellite measurements and atmospheric analyses
Forcing Heights 2 m for air temperature and specific humidity, 10 m for wind
Elevation Definition GTOPO30
Vegetation Definition University of Maryland, 1 km
Soils Definition Reynolds, Jackson, and Rawls [1999]
Land Surface Models Mosaic, CLM2, Noah, VIC
Output Format GRIB, NetCDF, ASCII, GDS

The land surface models currently run in GLDAS have following number of vertical levels and depths.

Mosaic 3 layers 0-0.02, 0.02-1.5, and 1.5-3.0 m
CLM2 10 layers 0-0.018, 0.018-0.045, 0.045-0.091, 0.091-0.166, 0.166-0.289, 0.289-0.493, 0.493-0.829, 0.829-1.383, 1.383-2.296, and 2.296-3.433 m
Noah 4 layers 0-0.1, 0.1-0.4, 0.4-1.0, 1.0-2.0 m
VIC 3 layers 0-0.1, 0.1-1.6, and 1.6-1.9 m