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Dead Zone in Gulf of Mexico Is Smaller Than Expected, But Severe

This year’s Gulf of Mexico dead zone is smaller than forecasted, measuring 3,000 square miles. However the dead zone, which is usually limited to water just above the sea floor, was severe where it did occur, extending closer to the water surface than in most years.

Deadzone on July 27, 2009. Credit: LUMCON. Click to enlarge.

Earlier this summer, forecast models developed by Dr. R. Eugene Turner, of Louisiana State University and Dr. Donald Scavia of the University of Michigan, predicted a larger than normal dead zone area of between 7,450 – 8,456 square miles. (Earlier post.) The forecast was driven primarily by the high nitrate loads and high freshwater flows from the Mississippi and Atchafalaya rivers in spring 2009 as measured by the US Geological Survey.

Dr. Nancy Rabalais, who led the assessment by scientists from the Louisiana Universities Marine Consortium (LUMCON), supported by the National Oceanic and Atmospheric Administration (NOAA), believes the smaller than expected dead zone is due to unusual weather patterns that re-oxygenated the waters, among other factors.

The winds and waves were high in the area to the west of the Atchafalaya River delta and likely mixed oxygen into these shallower waters prior to the cruise, thus reducing the area of the zone in that region. The variability we see within each summer highlights the continuing need for multiple surveys to measure the size of the dead zone in a more systematic fashion.

—Nancy Rabalais

The average size of the dead zone over the past five years, including this cruise, is now 6,000 square miles. The interagency Gulf of Mexico/Mississippi River Watershed Nutrient Task Force has a goal to reduce or make significant progress toward reducing this dead zone average to 2,000 square miles or less by 2015. The Task Force uses a five year average due to relatively high interannual variability.

The dead zone is fueled by nutrient runoff, principally from agricultural activity, which stimulates an overgrowth of algae that sinks, decomposes, and consumes most of the life-giving oxygen supply in the water. The Gulf of Mexico dead zone is of particular concern because it threatens valuable commercial and recreational Gulf fisheries that generate about $2.8 billion annually.

The models used to forecast the area of the dead zone are constructed for understanding the important underlying causes to inform long-term management decisions, but they do not include short-term variability due to weather patterns.

Prior to the Louisiana consortium cruise, NOAA’s Southeast Monitoring and Assessment Program found a similar sized dead zone during its annual five-week summer fish survey.


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