GLDAS Noah Land Surface Model L4 monthly 0.25 x 0.25 degree Version 2.0 V020

Metadata Updated: May 6, 2016

Global Land Data Assimilation System Version 2 (hereafter, GLDAS-2) has two components: one forced entirely with the Princeton meteorological forcing data (hereafter, GLDAS-2.0), and the other forced with a combination of model and observation based forcing data sets (hereafter, GLDAS-2.1).

This data set, GLDAS-2.0 0.25 degree monthly generated through temporal averaging of the 3-hourly data, contains a series of land surface parameters simulated from the Noah Model 3.3, currently covers from 1948 to 2010 and will be extended to recent years as the data set becomes available.

The model simulation was initialized on simulation date January 1, 1948, using soil moisture and other state fields from the LSM climatology for that day of the year. The simulation was forced by the global meteorological forcing data set from Princeton University (Sheffield et al., 2006). The simulation used the common GLDAS data sets 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).

The main objective for Version 2 is to create more climatologically consistent data sets using the Princeton forcing data sets extending from 1948. In Version 1, forcing sources switched several times throughout the record from 1979 to present, which introduced unnatural trends and exhibited highly uncertain forcing fields in 1995-1997. Other enhancements made in Version 2 include model version upgrade, switching to MODIS based land surface parameter data sets, and initialization of soil moisture over desert. In NOAH model, the bottom layer temperature data set was also updated. More details regarding the land surface parameter data changes at http://ldas.gsfc.nasa.gov/gldas/.

WGRIB or other GRIB reader is required to read the files. The data set applies a user-defined parameter table to indicate the contents and parameter numbers. The GRIBTAB file (http://disc.sci.gsfc.nasa.gov/hydrology/grib_tabs/gribtab_GLDAS_V2.txt) shows a list of parameters for this data set, along with their Product Definition Section (PDS) IDs and units.

There are four vertical levels for the Soil Moisture (PDS 086) and Soil Temperature (PDS 085) in the Noah GRIB files. For more information, please see the README Document at http://hydro1.sci.gsfc.nasa.gov/data/s4pa/GLDAS/GLDAS_NOAH025_3H.020/doc/README.GLDAS2.pdf or the GrADS ctl file at ftp://hydro1.sci.gsfc.nasa.gov/data/gds/GLDAS/GLDAS_NOAH025_M.020.ctl.

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Public: This dataset is intended for public access and use. License: U.S. Government Work
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Dates

Metadata Created Date October 8, 2014
Metadata Updated Date May 6, 2016
Data Update Frequency irregular

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date October 8, 2014
Metadata Updated Date May 6, 2016
Publisher GESDISC
Unique Identifier C207169865-GSFCS4PA
Maintainer
PLEASE CONTACT GES DISC HELP DESK SUPPORT GROUP
Maintainer Email
Id {$oid: 55942a62c63a7fe59b496320}
Public Access Level public
Data Update Frequency irregular
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Collection Metadata true
Harvest Object Id 8af2ec9c-6da4-41ca-afaf-85019d83d6df
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2013-09-24T00:00:00.000Z
Homepage URL http://reverb.echo.nasa.gov/reverb?selected=C207169865-GSFCS4PA
Language en-US
License http://www.usa.gov/publicdomain/label/1.0/
Metadata Type geospatial
Data Last Modified 2015-04-27T00:00:00.000Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > GESDISC
Rights None
Source Datajson Identifier True
Source Hash 43039078cbf0973f5d203c07a8fba9b66b5577d6
Source Schema Version 1.1
Spatial -180.0 -60.0 180.0 90.0
Temporal R/1948-01-01T00:00:00Z/P1Y
Category geospatial

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