Where's the Oil From the BP Spill? Researchers Look at the Ocean Floor

BP oil spillIt's been nearly five months since the start of the massive BP (BP) oil spill, and many questions about its long-term environmental impact are still unanswered. An estimated 4.9 million barrels of oil -- more than 200 million gallons -- were released after April's deadly fire and explosion on BP's Deepwater Horizon oil rig.

And now a team of marine scientists from the University of Georgia (UGA) thinks they know where a large portion of the oil from the BP spill has gone.

Last month, the National Oceanic and Atmospheric Administration (NOAA) and the Department of the Interior (DOI) estimated about one-third of the oil released by the BP spill had been contained by recovery operations, and that another third had naturally evaporated, dissolved or been dispersed into microscopic droplets.

The report said the remaining amount "is either on or just below the surface as residue and weathered tarballs, has washed ashore or been collected from the shore, or is buried in sand and sediments. Dispersed and residual oil remain in the system until they degrade through a number of natural processes. Early indications are that the oil is degrading quickly."

Millions of liters of toxic dispersants were also used during containment operations, in a controversial move to break up the BP spill.

But the UGA team, lead by Professor Samantha Joye, believes much of the oil has instead settled on the bottom of the Gulf of Mexico in an inches-thick layer.

Oil Snow?

Dr. Joye has been keeping a blog on the team's findings. In a recent entry, she talks about how core samples her team took about 16 nautical miles from the wellhead, and discovering "something we had not seen before: a layer of flocculent [fluffy or woolly in appearance], sedimented oil that was [centimeters] thick." When oil naturally seeps from the ocean floor, she says, the recovered core samples will be saturated, "oil-stained from top to bottom." But at the site visited by the researchers, Dr. Joye says the oil "obviously came from the top (down from the water column) not the bottom (up from a deep reservoir). What we found today is not a natural seep."

"We call it 'oil aggregate snow'," she writes, "because it settled down to the water column to the seafloor just like snow falls from the sky to the ground."

The UGA team is still determining the thickness of the oil on the Gulf of Mexico's floor, and is examining other sites near the wellhead. A photo of one recent core sample, shown on Dr. Joye's blog, appears to show a two-inch-thick layer of oil lying on top of the normal sediment.

Soon after Dr. Joye posted her blog entry, the NOAA, along with the U.S. Environmental Protection Agency (EPA) and the Office of Science and Technology Policy (OSTP), issued a report -- that it has found "Decreased, but Stabilized Levels of Dissolved Oxygen in Gulf Areas with Subsurface Oil."

According to the report, dissolved oxygen levels in the Gulf of Mexico affected by subsurface oil have dropped by about 20% from their long-term average levels. But "[s]cientists from agencies involved in the report attribute the lower dissolved oxygen levels to microbes using oxygen to consume the oil from the BP Deepwater Horizon oil spill."

The report says the dissolved oxygen levels were measured within 60 miles of the well head and were not low enough to create "dead zones," or areas where the oxygen level is so low it can't support most aquatic life.

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kastmaster2105

GAS CARD.....that is!!!!

September 14 2010 at 11:04 AM Report abuse rate up rate down Reply
kastmaster2105

Where do we sign up for the $150 free card BP will issue to all Gulf Coast residents for the aggrevation we had to put up w/?

September 14 2010 at 10:57 AM Report abuse rate up rate down Reply
wesley kirkland

Forget about the gulf what about our own shoreline;s when i was ten year;s old i went to M/bay just before Blackpool, One morning when the tide was out i walked out to the water;s edge; sunk up too my waist in a oil sludge just under the sand there was no one about too help i was lucky too get out alive, wes

September 14 2010 at 5:17 AM Report abuse rate up rate down Reply
del gage

del gage - Amen to ericdohse

September 14 2010 at 12:04 AM Report abuse -1 rate up rate down Reply
jim

I have never been a fan of boycotting anything. There's a mentality in this country that companies should be "punished" and boycotted for their mistakes but the only ones being punished are the little guys, the worker bees. The millionaires at the top that make all the decisions are immune to your little boycotts.

September 13 2010 at 11:27 PM Report abuse rate up rate down Reply
jaybachbot

Kidding of course. Actually I have been on many cruises, and LOVE the Caribbean / Gulf. That oil spill breaks my heart. And sadly there will be damage for many years to come, on my favorite part of this planet.

September 13 2010 at 8:48 PM Report abuse rate up rate down Reply
jaybachbot

I'm going on a five day cruise across the Gulf, leaving from Tampa the end of this month. Do you think my ship will be sailing along, and just get stuck in a big gooey glob of oil ?

September 13 2010 at 8:40 PM Report abuse rate up rate down Reply
Gg

All kinds of treasure down there.

September 13 2010 at 8:04 PM Report abuse rate up rate down Reply
ericdohse

OBAMA BOYCOTT! Not so much for the spill but for the irresponsible lack of response in allowing measures to deter, capture, and prevent the spill from coming on shore in a timely manner. HOPEFULLY... NO ONE WILL EVER VOTE FOR THIS BUFFOON & HIS ILK (those like him) ever, ever again... An uncontrolled MARXIST SPILL IN D.C. has and will continue to prove far more detrimental and destructive than any oil spill ever could to this country...

September 13 2010 at 7:58 PM Report abuse rate up rate down Reply
phylliskunz

Lawsuits would be more effective than boycotting BP, and you would think the Pope would come to America, not Great Britian, because of the British invasion of our country.

September 13 2010 at 7:52 PM Report abuse -1 rate up rate down Reply