As BP works to finally kill its runaway well and anxious coastal residents breathe a sigh of relief, experts warn that it could take years — or even decades — for the Gulf of Mexico to recover.
Three weeks after the flow was fully stemmed with a temporary cap, the massive slick that once spread for hundreds of kilometers has been mostly dissolved or dispersed.
Nightmare
Nightmare scenarios in which tens of thousands of birds were smothered to death by blankets of oil proved unfounded after the bulk of the slick stayed offshore. Fishermen who feared their way of life was destroyed are being allowed back into most waters.
“There’s essentially no skimmable oil left on the surface,” Doug Suttles, BP’s chief operating officer, told reporters on Friday. “Things have improved quite dramatically and that’s a combination of the work we’ve done and Mother Nature.”
However, while Suttles appeared relieved that the well was finally plugged and should be officially “killed” in a matter of days, he said that “we’re far from finished.”
Hundreds of kilometers of Louisiana’s fragile coastal wetlands remain coated with sticky sludge and each tide carries fresh tar balls onto once-pristine beaches as far away as Florida.
Vast quantities of oil remain hidden below the waves, suspended in the water column in droplets that remain toxic to the fish and other marine life that once supported a multibillion US dollar commercial and recreational fishing industry.
The good news is that the oil appears to be biodegrading rapidly.
The problem is that there is simply so very much out there.
It took 87 days to fully cap the well in the wake of a devastating explosion on April 20 that killed 11 workers and sank the BP-leased Deepwater Horizon rig, unleashing a torrent of oil into the Gulf.
In that time, 4.1 million barrels of oil escaped into the sea: enough to fill 260 Olympic-sized pools and make this one of the world’s worst spills on record. Just 8 percent of the oil was removed from the sea by skimmers and controlled burns. A government report issued last week estimates that another 42 percent is essentially “gone” thanks the heavy use of chemical dispersants and natural processes like evaporation and the microbes that feed on hydrocarbons.
“This whole notion that that stuff is weathering away is really questionable,” said Jim Cowan, a professor in Louisiana State University’s department of oceanography and coastal sciences. “What dispersed oil does is eventually dissolves into sea water and the ultimate fate of that is ultimately undetermined.”
Ixtoc blowout
Tarballs from the 1979 Ixtoc blowout are still washing up on Texas beaches. While the oil may float initially, it will sink once mixed with sand or sediment and then get kicked back up again during storms, he said.
“What this has turned into now is the potential for a long-term chronic problem,” he said in a telephone interview. “Chronic impacts are always more difficult to deal with from an ecosystem standpoint.”
The toxic mix of oil and chemical dispersants could decimate fish populations by killing off vulnerable larvae and reducing the reproductivity of those that survive.
“It’s a race between the microbes eating it and everything else being exposed to it,” said Larry McKinney, executive director of the Harte Research Institute for Gulf of Mexico Studies. “Microbial action comes at a cost. They’re organisms. They use oxygen.”
The Gulf was already under stress from coastal erosion and a massive “dead zone” created when agricultural runoff from the Mississippi River feeds algae, which sucks the oxygen out of the water.
“We will likely have a pretty severe impact,” McKinney told reporters, adding that the real concern was that the oil spill could be the final tipping point for an already stressed ecosystem. “You can only be knocked down so many times before you can’t get back up again.”
Marine conservationist Rick Steiner, a retired University of Alaska scientist, said it was far too soon to hazard a guess at the true impact of the spill.
“What we’re hearing is they don’t think the damage will be as bad as they initially thought,” Steiner said. “We have to remember that the same thing was said after the Exxon Valdez, but much of the damage didn’t become apparent until the second or third year.”
Herring stocks have still not returned more than 20 years after the Valdez ran aground in Prince William Sound, Alaska. And oil is still seeping out of underground pockets on that rocky shore when it rains.
Spike Lee
Filmmaker Spike Lee is calling a “lie” a government report that 75 percent of the spilled Gulf Coast oil is gone.
Speaking to a meeting of the Television Critics Association in Beverly Hills, California, on Saturday, Lee said journalists should expose what he called the real story.
He argued that it’s unlikely that “abracadabra, presto chango” the vast majority of the oil has vanished from Gulf of Mexico waters and coastal wetlands.
Federal scientists said last week that nearly three-quarters of the oil had been removed by various artificial or natural means, but that the spill’s effect on wildlife would long continue.
Lee was promoting his new documentary about New Orleans after Hurricane Katrina.
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