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Nutrient Loads to the Gulf of Mexico. Mike Woodside U.S. Geological Survey TN. What is hypoxia?. What causes hypoxia?. Excess nutrient loading to the Gulf of Mexico Seasonal Stratification of Gulf Waters. Is Hypoxia in the northern Gulf of Mexico getting better or worse?.

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Nutrient loads to the gulf of mexico

Nutrient Loads to the Gulf of Mexico

Mike Woodside

U.S. Geological Survey

TN



What causes hypoxia
What causes hypoxia?

Excess nutrient loading to the Gulf of Mexico

Seasonal Stratification of Gulf Waters




Mississippi atchafalaya river basin nitrogen loads
Mississippi/Atchafalaya River Basin Nitrogen Loads Hypoxic Zone

Source: USGS: Aulenbach and others, 2010


Mississippi atchafalaya river basin phosphorus loads
Mississippi/Atchafalaya River Basin Phosphorus Loads Hypoxic Zone

Source: USGS: Aulenbach and others, 2010


USGS Releases Nutrient Load Estimates Online each year for Mainstem sites and Nine Major Tributaries

  • MRB Clinton, IA

  • MRB Alton, IL

  • Missouri River at Omaha, NE

  • Missouri River at Herman, MO

  • MRB at Thebes, IL

  • Ohio River at Cannelton, IN

  • Ohio River at Grand Chain, IL

  • Arkansas River below Little Rock, AR

  • Red River at Simmesport, LA

http://water.usgs.gov/nasqan/


Nutrient delivery and sources
Nutrient Delivery and Sources Mainstem sites and Nine Major Tributaries

Areas with Highest Delivered Yields of Nitrogen to the Gulf of Mexico

Sources of Nitrogen Delivered

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
Importance of Groundwater Nutrient Contributions watersheds in the Mississippi/Atchafalaya River Basin

Fenelon, 1998



Comprised of: drinking water resources

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
Nutrient Reduction Actions in the Basin drinking water resources


Challenges needs
Challenges/Needs drinking water resources

  • 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
BBQ and Shrimp drinking water resources

Mike Woodside

U.S.Geological Survey

National Water-Quality Assessment Program

Nashville, TN

[email protected]

615-837-4706


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