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NLDAS Monthly Climatology data sets are released at NASA GES DISC

Data used for research on drought, floods, watersheds, water and energy budgets

NLDAS Monthly Climatology data sets are released at NASA GES DISC

Precipitation anomaly analysis is one of the capabilities enabled by NLDAS monthly climatology data.

NLDAS Monthly Climatology data sets are released at NASA GES DISC

 

The NASA GSFC Hydrological Sciences Laboratory (HSL) and Goddard Earth Sciences Data and Information Services Center (GES DISC) are pleased to announce the release of the North American Land Data Assimilation System (NLDAS) monthly climatology data sets in the Hydrology DISC (http://disc.sci.gsfc.nasa.gov/hydrology/data-holdings). 
 
NLDAS monthly climatology data are generated from the NLDAS monthly data as an 11-year (1997 – 2007) monthly average for NLDAS Phase 1 (NLDAS-1) data, and a 30-year (1980 – 2009) monthly average for NLDAS Phase 2 (NLDAS-2) data. More information about how monthly climatology data are generated is available in the NLDAS README documents, located at http://disc.sci.gsfc.nasa.gov/hydrology/documentation.
 
NLDAS is a collaborative project between NASA Goddard Space Flight Center (GSFC), the National Oceanic and Atmospheric Administration (NOAA), Princeton University, and the University of Washington. NLDAS data are broadly used by various user communities in modeling, research, and applications, such as drought and flood monitoring, watershed and water quality management, and case studies of extreme events. The NLDAS monthly climatology data should further facilitate the climatology, anomalies, and trend studies of water and energy budgets.
 
All NLDAS data sets available from NASA GES DISC can be accessed from the Hydrology Data Holdings Portal, http://disc.sci.gsfc.nasa.gov/hydrology/data-holdings, using direct ftp, Mirador search and download, Simple Subset Wizard, and Giovanni online visualization and analysis. The NLDAS monthly climatology data sets have been incorporated into the Giovanni NLDAS Monthly Portal, which enables NLDAS climatology and anomaly analysis. A new Giovanni portal, the NLDAS Monthly Climatology Portal, is also available for NLDAS monthly climatology visualization and analysis.  
 

The following sample images (Figures 1 – 8) were generated from NLDAS monthly and monthly climatology data via the Giovanni NLDAS Portals, and Figure 9 was generated by the Grid Analysis and Display System (GrADS).

Animation of monthly precipitation climatology (1980 -2009) from NLDAS-2 Primary Forcing data

 

Figure 1.  Animation of monthly precipitation climatology (1980 -2009) from NLDAS-2 Primary Forcing data, generated via the Giovanni NLDAS Monthly Climatology Portal.

 

 

Time series of the climatological annual cycle of monthly NLDAS-2 Primary Forcing precipitation (1980 - 2009, averaged over the entire NLDAS domain),

Figure 2. Time series of the climatological annual cycle of monthly NLDAS-2 Primary Forcing precipitation (1980 - 2009, averaged over the entire NLDAS domain), generated via the Giovanni NLDAS Monthly Climatology Portal.
 

 

 Seasonal climatology (1980 – 2009) of monthly NLDAS-2 Noah model top 1-meter soil moisture content

 

Figure 3. Seasonal climatology (1980 – 2009) of monthly NLDAS-2 Noah model top 1-meter soil moisture content, generated via the Giovanni NLDAS Monthly Climatology Portal. [Click image to view full-size version.]

 

Time series of the climatological annual cycle of monthly NLDAS-2 Noah model top 1-meter soil moisture content (1980 - 2009, averaged over the entire NLDAS domain)

 

Figure 4. Time series of the climatological annual cycle of monthly NLDAS-2 Noah model top 1-meter soil moisture content (1980 - 2009, averaged over the entire NLDAS domain), generated via the Giovanni NLDAS Monthly Climatology Portal.

 

Anomaly of the monthly NLDAS-2 Primary Forcing precipitation for autumn 2011 (September – November), with significant negative anomalies over Texas and Minnesota and Iowa

 

Figure 5.  Anomaly of the monthly NLDAS-2 Primary Forcing precipitation for autumn 2011 (September – November), with significant negative anomalies over Texas and Minnesota and Iowa, generated via the Giovanni NLDAS Monthly Portal. Significant positive anomalies occurred in Pennsylvania and Tennessee during this season.
 
Time series of the anomaly of monthly NLDAS primary forcing precipitation (with 1980 – 2009 climatological annual cycle removed, averaged over the center area of Texas)
Figure 6. Time series of the anomaly of monthly NLDAS primary forcing precipitation (with 1980 – 2009 climatological annual cycle removed, averaged over the center area of Texas), generated via the Giovanni NLDAS Monthly Portal. The simple linear regression (red line) does not show a significant trend.

 

Anomaly of the NLDAS-2 Noah model top 1-meter soil moisture content for autumn 2011 (September – November), with the 1980 – 2009 climatology removed, showing significant negative anomalies (drought) over Texas and Minnesota and Iowa

 

Figure 7. Anomaly of the NLDAS-2 Noah model top 1-meter soil moisture content for autumn 2011 (September – November), with the 1980 – 2009 climatology removed, showing significant negative anomalies (drought) over Texas and Minnesota and Iowa, generated via the Giovanni NLDAS Monthly Portal.

 

Time series of the anomaly of the monthly NLDAS-2 Noah model top 1-meter soil moisture content (with the 1980 – 2009 climatological annual cycle removed), averaged over the center area of Texas

 

Figure 8. Time series of the anomaly of the monthly NLDAS-2 Noah model top 1-meter soil moisture content from Jan. 1979 - Dec. 2012 (with the 1980 – 2009 climatological annual cycle removed), averaged over the center area of Texas, generated via the Giovanni NLDAS Monthly Portal. The simple linear regression (red line) shows a slight downward trend.
 
 
Time series of the NLDAS-2 Primary Forcing precipitation anomalies (black line) and time series of the NLDAS-2 Noah model top 1-meter soil moisture content anomalies (green line)
 
Figure 9. Time series of the NLDAS-2 Primary Forcing precipitation anomalies (black line) and time series of the NLDAS-2 Noah model top 1-meter soil moisture content anomalies (green line), area-averaged over the center area of Texas and with the 1980 – 2009 climatological annual cycle removed, and smoothed with a 3-month running mean.  The time series of precipitation anomalies (back line) and top 1-meter soil moisture anomalies (green line) show a moderate correlation (with correlation coefficient = 0.683).  The low and high peaks of the top 1-meter soil moisture occur about one month behind the peaks of the precipitation (with 1-month lag correlation coefficient = 0.814).  This plot is generated by GrADS. [Click image to see full-size version.]

 

Acknowledgments

Author: Hualan Rui.  Reviewers: Bill Teng, David Mocko, Bruce Vollmer.

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

 

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Last updated: Apr 02, 2014 01:40 PM ET
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