The Deepwater Horizon oil spill spread much farther than once thought
Nearly a decade after the Deepwater Horizon oil spill in the Gulf of Mexico, computer simulations suggest that the toxic pollution extended much farther than satellite images first indicated. Those images, taken after the spill dumped nearly 800 million liters of oil into Gulf waters, helped to determine which areas would be temporarily closed for fishing (SN: 4/3/15). Scientists’ observations since then had suggested that the oil had spread farther (SN: 7/31/14). The new analysis confirms that fact with computer simulations, which considered ocean currents, oil evaporation and other factors to map the spill’s true expanse. Satellites appear to have overlooked at least 30 percent of the hazardous pollution, says biological oceanographer Claire Paris-Limouzy of the University of Miami. The simulations uncovered vast ocean swaths where oil concentrations were high enough to endanger marine life, but dilute enough to have been overlooked by satellites, Paris-Limouzy and colleagues report online February 12 in Science Advances. Water and sediment samples from around the Gulf supported the findings. Where...