Do You Know Where Your Seafood Was Swimming???

Oil from the Deepwater Horizon spill formed an underwater plume of hydrocarbons the size of Manhattan, a lingering cloud of trace chemicals in the Gulf with an unknown long-term impact. U.S. National Science Foundation research vessel explored the plume—22 miles long and more than a mile wide—as it snaked along t 3,000 feet below the surface.
Scientists have confirmed that oil from the well is suspended below the surface in pools of microscopic oil drops and petroleum-based trace chemicals, which were degrading more slowly than many had expected. The plume resembled a mist of trace chemicals, rather than a river of oil, however as much as 79% of the spilled oil may still be in the Gulf. Oil is already settling into the sea floor in a prime spawning ground for fish called DeSoto Canyon east of the damaged well, according to University of South Florida scientists.
Woods Hole researchers saw little evidence in June, two months after a wellhead explosion triggered the spill, that oil-eating microbes had reduced the cloud of chemicals. In fact the oil is degrading relatively slowly. In normal circumstances, crude oil floats to the surface, where it can be skimmed, burned off or evaporated. Floating on the waves, it can be churned into smaller drops readily digested by bacteria.
But oil broken down by chemical dispersants are held at depth by water pressure, forming microscopic droplets not buoyant enough to break through the transition layer that separates warm surface currents from the cold bottom water. Researchers said they found high concentrations of benzene, toluene, xylene and other so-called BTEX petroleum compounds that could be traced to the leaking well. The plume contained between 5% and 6% of the signature BTEX petroleum hydrocarbons released during the spill. Yummy! You going to feed that to your family?
Woods Hole Oceanographic Institution has evidence about how the Gulf water is interacting with the mass of oil wich directly challenges government estimates that the vast majority of the 4.9 million barrels of spilled oil is already gone from the Gulf or is being rapidly broken down by bacteria. The report indicates the oil that spilled from the Deepwater Horizon has produced a drifting plume of hydrocarbons the size of Manhattan. Some of that oil persists deep underwater—at levels thousands of times higher than natural oil seeps that dot the Gulf sea floor—where it eludes conventional detection and cleanup efforts.
This news will deal another blow to the fishing industry, which may never return to normal even though state and federal waters were reopened in recent weeks. The demand for Gulf seafood has nearly disappeared amid images of oil-slicked waters even though the U.S. Food and Drug Administration says seafood from the parts of the Gulf open to fishing pose no health risks. How can we believe that?
No one can know how long an oil plume of this magnitude will last or what the long-term impact will be. But experts are concerned that if the trace chemicals linger long enough, they could damage fish eggs, larvae, and plankton- the backbone of the food chain which many fish feed on. “These hydrocarbons may well show up somewhere else, running undetected below the surface,” said Richard Camilli from the Massachusetts-based Woods Hole group, who was chief scientist on the research.
~ Recent Comments ~