GLDAS Noah Land Surface Model L4 monthly 1.0 x 1.0 degree V020 (GLDAS_NOAH10_M) at GES DISC
Entry ID: GES_DISC_GLDAS_NOAH10_M_V020

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Summary
Abstract: 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 1.0 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 following table shows a list of parameters, their Product Definition Section (PDS) IDs and units.

PDS_IDs Full_Name Unit
84 Surface Albedo, All Wavelengths unitless
148 Average Surface Temperature K
223 Plant canopy surface water kg/m^2
200 Canopy water evaporation kg/m^2/s
199 Bare soil evaporation kg/m^2/s
57 Total Evapotranspiration kg/m^2/s
205 Surface incident longwave radiation W/m^2
112 Net Longwave Radiation W/m^2
1 Surface pressure Pa
59 Total precipitation rate kg/m^2/s
51 Near surface specific humidity kg/kg
155 Ground Heat Flux W/m^2
122 Sensible Heat Flux W/m^2
121 Latent Heat Flux W/m^2
235 Surface Runoff kg/m^2/s
234 Subsurface Runoff kg/m^2/s
99 Snowmelt kg/m^2/s
162 Rainfall rate kg/m^2/s
173 Root zone soil moisture kg/m^2
65 Snow Water Equivalent kg/m^2
204 Surface incident shortwave radiation W/m^2
111 Net Shortwave Radiation W/m^2
66 Snow Depth m
161 Snowfall rate kg/m^2/s
86 0-10 cm underground Soil moisture content kg/m^2
86 10-40 cm underground Soil moisture content kg/m^2
86 40-100 cm underground Soil moisture content kg/m^2
86 100-200 cm underground Soil moisture content kg/m^2
85 0-10 cm underground Soil temperature K
85 10-40 cm underground Soil temperature K
85 40-100 cm underground Soil temperature K
85 100-200 cm underground Soil temperature K
210 surface Vegetation transpiration kg/m^2/s
11 surface Near surface air temperature K
32 surface Near surface wind speed m/s

There are four vertical levels for the Soil Moisture (PDS 086) and Soil Temperature (PDS 085) in the GRIB file. For more information, please see http://hydro1.sci.gsfc.nasa.gov/data/s4pa/GLDAS/GLDAS_NOAH10_M.020/doc/README.GLDAS2.pdf

Related URL
Link: GET DATA


Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: README document for GLDAS Version 2 data sets.


Geographic Coverage
 N: 90.0 S: -60.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: Hydrological Sciences Branch at NASA/Goddard Space Flight Center (GSFC/HSB)
Dataset Title: GLDAS Noah Land Surface Model L4 monthly 1.0 x 1.0 degree Version 2.0
Dataset Release Date: 10.01.2012
Dataset Release Place: Greenbelt, Maryland, USA
Dataset Publisher: Goddard Earth Sciences Data and Information Services Center (GES DISC)
Version: 020
Online Resource: http://disc.sci.gsfc.nasa.gov/hydrology/index.shtml


Temporal Coverage
Start Date: 1948-01-01


Location Keywords
GEOGRAPHIC REGION > ARCTIC
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 1 degree
Longitude Resolution: 1 degree
Temporal Resolution: monthly


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >SURFACE PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >HEAT FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >LONGWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SHORTWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >EVAPOTRANSPIRATION    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS    [Definition]
ATMOSPHERE >PRECIPITATION >RAIN    [Definition]
ATMOSPHERE >PRECIPITATION >SNOW    [Definition]
LAND SURFACE >LAND TEMPERATURE >LAND SURFACE TEMPERATURE    [Definition]
LAND SURFACE >SOILS >SOIL MOISTURE/WATER CONTENT    [Definition]
LAND SURFACE >SOILS >SOIL TEMPERATURE    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW WATER EQUIVALENT    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >RUNOFF    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >HUMIDITY INDICES >HUMIDITY INDEX    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
GLDAS >Global Land Data Assimilation System    [Information]
CWIC >CEOS WGISS Integrated Catalog    [Information]


Quality
The data are provisional and subject to change as model improvements are implemented and new input data sets become available. Due to the fact that forcing data for Greenland are unreliable and the lack of a glacier/ice sheet model, snow water equivalent accumulates indefinitely in Greenland and a few other Arctic points. Therefore it is highly recommended that Greenland and other points with abnormally large snow water equivalent values be masked out when performing global analyses.


Access Constraints
None


Use Constraints
None


Keywords
Hydrology


Data Set Progress
IN WORK


Originating Center
Hydrological Sciences Branch at NASA/Goddard Space Flight Center (GSFC)


Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://disc.gsfc.nasa.gov/

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Distribution
Distribution_Media: Online (HTTP)
Distribution_Format: GRIB
Fees: No Fee


Personnel
GES DISC HELP DESK SUPPORT GROUP
Role: TECHNICAL CONTACT
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References
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.

Creation and Review Dates
DIF Creation Date: 2012-09-17
Last DIF Revision Date: 2012-11-01

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