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ENVIRO-NEWS  June 2009

ENVIRO-NEWS June 2009

Subject:

New USGS Article on Nitrogen Loading and Delivery to Streams and Coastal Areas in the Southeastern U.S.

From:

"Makuch, Joseph" <[log in to unmask]>

Reply-To:

Makuch, Joseph

Date:

Mon, 29 Jun 2009 10:38:51 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (82 lines)

From: Michael D Woodside [mailto:[log in to unmask]] 
Sent: Saturday, June 27, 2009 3:27 PM
Subject: New USGS Article on Nitrogen Loading and Delivery to Streams
and Coastal Areas in the Southeastern U.S.

[deletions]



The U.S. Geological Survey National Water-Quality Assessment (NAWQA)
program assessed total nitrogen loads and yields in streams throughout
the southeastern United States using the USGS watershed model SPARROW
(Spatially Referenced Regression On Watershed Attributes). 

Results from the southeast regional total nitrogen SPARROW model
<http://water.usgs.gov/nawqa/pubs/nitrogen_loads/>  indicate that
atmospheric deposition is the largest source of nitrogen delivered
annually to many estuaries along the South Atlantic and Gulf Coasts,
such as Mobile and Apalachicola Bays. 

The regional model integrates Federal, State, and local agency
monitoring data at 321 stations with geospatial data describing 2002
nitrogen sources (fertilizer, animal waste, and urban inputs,
atmospheric deposition, and wastewater discharges) and watershed
properties (soil characteristics, precipitation, and land cover). The
combination of more calibration sites and refined geospatial data
provides significant improvement over previous SPARROW models in
prediction accuracy and the identification of regional nutrient sources
and transport factors.   

Results of this study are described in the journal Hydrological
Processes article and detailed supplemental tables with model
predictions for instream load and yield for 8,028 stream reaches and 293
shoreline reaches and the fraction of instream load that is delivered to
the basin outlet. 

Results from the southeast regional SPARROW model can be used to assess:

*        transport of nitrogen to streams from watersheds, 
*        removal of nitrogen by processes within streams, 
*        contributions of nitrogen from different sources in watersheds,

*        transport and delivery of nitrogen to receiving water bodies,
including the 30 major estuaries along the South Atlantic and Gulf
Coasts, 
*        conditions and transport in unmonitored streams, 
*        priorities for future monitoring and assessment, and 
*        response of nitrogen levels to proposed management actions. 


For more information on nitrogen loading and delivery to streams and
coastal areas in the southeast, contact:  Anne Hoos, [log in to unmask]
<mailto:[log in to unmask]>  



_____________________________________________
Mike Woodside
USGS -- National Water-Quality Assessment Program
640 Grassmere Park, Suite 100
Nashville, TN 37211
615-837-4706
http://water.usgs.gov/nawqa/ <http://water.usgs.gov/nawqa/> 
_____________________________________________


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The Enviro-News list facilitates information exchange.
Inclusion of an item in Enviro-News does not imply
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