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Mysterious flotsam in Gulf of Mexico came from Deepwater Horizon rig, WHOI study finds
Date:1/19/2012

Shortly after the Deepwater Horizon disaster, mysterious honeycomb material was found floating in the Gulf of Mexico and along coastal beaches. Using state-of-the-art chemical forensics and a bit of old-fashioned detective work, a research team led by scientists at Woods Hole Oceanographic Institution (WHOI) confirmed that the flotsam were pieces of material used to maintain buoyancy of the pipe bringing up oil from the seafloor.

The researchers also affirmed that tracking debris from damaged offshore oil rigs could help forecast coastal pollution impacts in future oil spills and guide emergency response effortsmuch the way the Coast Guard has studied the speed and direction of various floating debris to guide search and rescue missions. The findings were published Jan. 19 in Environmental Research Letters.

On May 5, 2010, 15 days after the Deepwater Horizon explosion, oceanographer William Graham and marine technicians from the Dauphin Island Sea Lab were working from a boat about 32 miles south of Dauphin Island, Ala., when they saw a 6-mile-long, east-west line containing more than 50 pieces of white material interspersed with sargassum weed. The porous material was uniformly embedded with black spheres about a centimeter in diameter. No oil slick was in sight, but there was a halo of oil sheen around the honeycomb clumps.

Two days later, the researchers also collected similar samples about 25 miles south of Dauphin Island. Nobody knew what the material was, with some hypothesizing at first that it could be coral or other substance made by marine plants or animals. Graham sent samples to WHOI chemist Chris Reddy, whose lab confirmed that the material was not biological. But the material's source remained unconfirmed.

In January 2011, Reddy and WHOI researcher Catherine Carmichael, lead author of the new study, collected a piece of the same unknown material of Elmer's Beach, Grand Isle, La. In April, 2011, they found
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Contact: WHOI Media Relations
media@whoi.edu
508-289-3340
Woods Hole Oceanographic Institution
Source:Eurekalert

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