U.S. Department of the Interior U.S. Geological Survey Nutrient Loads to the Gulf of Mexico Mike Woodside U.S. Geological Survey TN.

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Presentation transcript:

U.S. Department of the Interior U.S. Geological Survey Nutrient Loads to the Gulf of Mexico Mike Woodside U.S. Geological Survey TN

What is hypoxia?

Excess nutrient loading to the Gulf of Mexico Seasonal Stratification of Gulf Waters What causes hypoxia?

Is Hypoxia in the northern Gulf of Mexico getting better or worse?

Spring Nutrient Loads Are Used to Estimate the Size of the Hypoxic Zone

Mississippi/Atchafalaya River Basin Nitrogen Loads Source: USGS: Aulenbach and others, 2010

Mississippi/Atchafalaya River Basin Phosphorus Loads Source: USGS: Aulenbach and others, 2010

USGS Releases Nutrient Load Estimates Online each year for Mainstem sites and Nine Major Tributaries 1.MRB Clinton, IA 2.MRB Alton, IL 3.Missouri River at Omaha, NE 4.Missouri River at Herman, MO 5.MRB at Thebes, IL 6.Ohio River at Cannelton, IN 7.Ohio River at Grand Chain, IL 8.Arkansas River below Little Rock, AR 9.Red River at Simmesport, LA /

Nutrient Delivery and Sources Sources of Nitrogen Delivered To the Gulf of Mexico Areas with Highest Delivered Yields of Nitrogen to the Gulf of Mexico Alexander and others, 2008

Rankings and the uncertainties of these rankings for 818 watersheds in the Mississippi/Atchafalaya River Basin Robertson and others, 2009

Importance of Groundwater Nutrient Contributions Fenelon, 1998

Elevated nutrient levels can also affect the quality of drinking water resources

Comprised of: Federal Agencies: EPA, NOAA, USDA, USACE, DOI States: AR, IL, IA, IN, KY, LA, MN, MS, MO, OH, TN, WI Goal: Strive to reduce or make significant progress towards reducing the five-year running average areal extent of the hypoxic zone to less than 5,000 square kilometers by the year 2015

Nutrient Reduction Actions in the Basin

Challenges/Needs Long-term Surface and Groundwater Quality Monitoring Enhance Nutrient Source Accounting Location and Quantification of Nutrient Reductions from Conservation Practices Suite of water quality models and online decision support tools to evaluate management alternatives

BBQ and Shrimp Mike Woodside U.S.Geological Survey National Water-Quality Assessment Program Nashville, TN