News Release 

New study shows Deepwater Horizon oil spill larger than previously thought

Toxic and invisible oil spread well beyond known satellite footprint, fishing closures

University of Miami Rosenstiel School of Marine & Atmospheric Science

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IMAGE: On April 20, 2010, the Deepwater Horizon oil rig exploded, releasing 210 million gallons of crude oil into the Gulf of Mexico for a total of 87 days, making it... view more 

Credit: US Coast Guard

MIAMI--Toxic and invisible oil spread well beyond the known satellite footprint of the Deepwater Horizon oil spill, according to a new study led by scientists at the University of Miami (UM) Rosenstiel school of Marine and Atmospheric Science. These new findings have important implications for environmental health during future oil spills.

The UM Rosenstiel School-led research team combine oil-transport modeling techniques with remote sensing data and in-water sampling to provide a comprehensive look at the oil spill. The findings revealed that a fraction of the spill was invisible to satellites, and yet toxic to marine wildlife.

"We found that there was a substantial fraction of oil invisible to satellites and aerial imaging," said the study's lead author Igal Berenshtein, a postdoctoral researcher at the UM Rosenstiel School. "The spill was only visible to satellites above a certain oil concentration at the surface leaving a portion unaccounted for."

On April 20, 2010, the Deepwater Horizon oil rig exploded, releasing 210 million gallons of crude oil into the Gulf of Mexico for a total of 87 days, making it the largest oil spill in U.S. history. Oil slicks from the blowout covered an estimated area of 57,000 square miles (149,000 square kilometers).

These new findings, published in Science Advances, showed a much wider extent of the spill beyond the satellite footprint, reaching the West Florida shelf, the Texas shores, the Florida Keys and along the Gulf Stream towards the East Florida shelf.

"Our results change established perceptions about the consequences of oil spills by showing that toxic and invisible oil can extend beyond the satellite footprint at potentially lethal and sub-lethal concentrations to a wide range of wildlife in the Gulf of Mexico," said Claire Paris, senior author of the study and professor of ocean sciences the UM Rosenstiel School. "This work added a 3rd dimension to what was previously seen as just surface slicks. This additional dimension has been visualized with more realistic and accurate oil spill models developed with a team of chemical engineers and more efficient computing resources."

The new framework developed by the researchers can assist emergency managers and decision makers in better managing the impacts of future potential oil spills, said the authors.

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The study, titled "Invisible oil beyond the Deepwater Horizon satellite footprint," was published on February 12, 2020 in the journal Science Advances. The study's co-authors include: Igal Berenshtein, Claire Paris, Natalie Perlin and Matthew Alloy from the UM Rosenstiel School; Samantha Joye from the University of Georgia; and Steve Murawski from the University of South Florida. Support for the study was provided by an award from The National Academies of Sciences - Gulf Research Program.

About the University of Miami's Rosenstiel School

The University of Miami is one of the largest private research institutions in the southeastern United States. The University's mission is to provide quality education, attract and retain outstanding students, support the faculty and their research, and build an endowment for University initiatives. Founded in the 1940's, the Rosenstiel School of Marine & Atmospheric Science has grown into one of the world's premier marine and atmospheric research institutions. Offering dynamic interdisciplinary academics, the Rosenstiel School is dedicated to helping communities to better understand the planet, participating in the establishment of environmental policies, and aiding in the improvement of society and quality of life. For more information, visit: http://www.rsmas.miami.edu and Twitter @UMiamiRSMAS

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