Skip to content. | Skip to navigation

Personal tools
You are here: GES DISC Home News NLDAS Phase 2 (NLDAS-2) Noah model data have been released

NLDAS Phase 2 (NLDAS-2) Noah model data have been released

Data set contains land surface parameters, with temporal coverage from January 1979 to present

NLDAS Phase 2 (NLDAS-2) Noah model data have been released

NLDAS-2 Noah rainfall, averaged over the time period of 08Z September 2 -12Z September 9, 2011, showing heavy rain brought by Tropical Storm Lee.

NLDAS Phase 2 (NLDAS-2) Noah model data have been released

 

The North American Land Data Assimilation System Phase 2 (NLDAS-2) 0.125ox0.125o hourly Noah model data (NLDAS_NOAH0125_H.002) are accessible via the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) Hydrology Data Holdings page. The data set contains a series of land surface parameters and has temporal coverage from 01Z January 02, 1979 to present, with latency about four days. More information about the data set can be found in the NLDAS-2 README document  (PDF).
 
 To further facilitate access and use of the data, the data have been made available via the Giovanni NLDAS hourly portal. The Giovanni portal provides a simple and intuitive way to visualize, analyze, and intercompare NLDAS data without having to download the data. Other available services, via Mirador, include parameter and spatial subsetting (http://disc.sci.gsfc.nasa.gov/gesNews/nldas_otf_subsetting) and GRIB–to-NetCDF conversion.
 
The data are also accessible via GrADS Data Server (GDS). The GDS subsetting capability allows users to retrieve a specified parameter, temporal and/or spatial subdomain in ASCII text . The GDS analysis capability allows users to retrieve the results of an operation applied to one or more data sets on the server.
 
NLDAS, with high spatial and temporal resolutions (0.125° x 0.125° hourly) and various water- and energy-related variables (precipitation, soil moisture, evapotranspiration, heat fluxes, etc.) is an excellent data source for supporting water and energy cycle investigations.

 

Figures 1–4 below show example NLDAS data as displayed via the Giovanni NLDAS hourly portal, for studying the effects of 2011's Tropical Storm Lee and model inter-comparison. The unit kg/m2 is equivalent to mm/hour.

Figure 1.  NLDAS-2 Noah rainfall, averaged over time period of 08Z Sep. 02 and 12Z Sep. 09, 2011, showings the heavy rain brought by Tropical Storm Lee.

Figure 1. NLDAS-2 Noah rainfall, averaged over the time period of 08Z September 2 -12Z September 9, 2011, showing heavy rain brought by Tropical Storm Lee.

Figure 2.  NLDAS-2 Noah layer 1(0-10 cm) soil moisture, averaged over time period of 08Z Sep. 02 and 12Z Sep. 09, 2011.  The high soil moisture regions coincide with the heavy rain regions in Figure 1.

 

Figure 2. NLDAS-2 Noah layer 1(0-10 cm) soil moisture, averaged over the time period of 08Z September 2 -12Z September 9, 2011. The high soil moisture regions coincide with the heavy rain regions in Figure 1.

 

Figure 3. Time series (08Z Sep. 2 – 12Z Sep. 12, 2011) of NLDAS-2 Noah hourly rainfall (blue line) and layer 1 (0-10 cm) soil moisture (red line) for a heavy rain region (77W ~ 75W, 39N ~ 42N – parts of Pennsylvania).

Figure 3. Time series (08Z September 2 – 12Z September 12, 2011) of NLDAS-2 Noah hourly rainfall (blue line) and layer 1 (0-10 cm) soil moisture (red line) for a heavy rain region (77W ~ 75W, 39N ~ 42N, corresponding to a region in Pennsylvania). The time series show high soil moisture peaks corresponding with rainfall peaks, with the characteristic slight time lags.

 

 noah_release_fig4.png

 Figure 4. Time series (08Z Sep. 2 – 12Z Sep. 12, 2011) of NLDAS-2 hourly layer 1 (0-10 cm) soil moisture inter-comparison, red line for Noah model data and black line for Mosaic model data, for Tropical Storm Lee heavy rain region (77W ~ 75W, 39N ~ 42N, corresponding to a region of Pennsylvania). 

 


NLDAS is a collaborative effort of NOAA, NASA, Princeton University, the University of Washington, and others.
 

The GES DISC is a NASA earth science data center, part of the NASA Earth Science Data and Information System (ESDIS) Project.

Questions or comments?  Email the NASA GES DISC Help Desk, gsfc-help-disc@lists.nasa.gov

Document Actions
 
NASA Logo - nasa.gov
NASA Privacy Policy and Important Notices
Last updated: May 04, 2012 02:52 PM ET
Top