Federal Science on the Fate of Oil from BP Spill

Thursday, August 05, 2010

According to a federal science report released August 4, the vast majority of the oil from the BP oil spill has either evaporated or been burned, skimmed, recovered from the wellhead or dispersed using chemicals –  much of which is in the process of being degraded. Much of this is the direct result of the federal response efforts.

A third (33 percent) of the total amount of oil released in the Deepwater Horizon/BP spill was captured or mitigated by the Unified Command recovery operations, including burning, skimming, chemical dispersion and direct recovery from the wellhead, according to the report.

An additional 25 percent of the total oil naturally evaporated or dissolved, and 16 percent was dispersed naturally into microscopic droplets.  The residual amount, just over one quarter (26 percent), 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.

These estimates were derived by the National Oceanic and Atmospheric Administration (NOAA) and the Department of the Interior (DOI), who jointly developed what’s known as an Oil Budget Calculator, to provide measurements and best estimates of what happened to the spilled oil.   The calculator is based on 4.9 million barrels of oil released into the Gulf, the government’s Flow Rate Technical Group estimate from Monday.  More than 25 of the best government and independent scientists contributed to or reviewed the calculator and its calculation methods.

“Teams of scientists and experts have been carefully tracking the oil since day one of this spill, and based on the data from those efforts and their collective expertise, they have been able to provide these useful and educated estimates about the fate of the oil,” said Jane Lubchenco, under secretary of commerce for oceans and atmosphere and NOAA administrator.  “Less oil on the surface does not mean that there isn’t oil still in the water column or that our beaches and marshes aren’t still at risk.  Knowing generally what happened to the oil helps us better understand areas of risk and likely impacts.”

The estimates do not make conclusions about the long-term impacts of oil on the Gulf.  Fully understanding the damages and impacts of the spill on the Gulf of Mexico ecosystem is something that will take time and continued monitoring and research.

Dispersion increases the likelihood that the oil will be biodegraded, both in the water column and at the surface.  While there is more analysis to be done to quantify the rate of biodegradation in the Gulf, early observations and preliminary research results from a number of scientists show that the oil from the BP Deepwater Horizon spill is biodegrading quickly.  Scientists from NOAA, EPA, DOE, and academic scientists are working to calculate more precise estimates of this rate.

It is well known that bacteria that break down the dispersed and weathered surface oil are abundant in the Gulf of Mexico in large part because of the warm water, the favorable nutrient and oxygen levels, and the fact that oil enters the Gulf of Mexico through natural seeps regularly.

Residual oil is also degraded and weathered by a number of physical and biological processes.  Microbes consume the oil, and wave action, sun, currents and continued evaporation and dissolution continue to break down the residual oil in the water and on shorelines.

The oil budget calculations are based on direct measurements wherever possible and the best available scientific estimates where measurements were not possible.  The numbers for direct recovery and burns were measured directly and reported in daily operational reports.  The skimming numbers were also based on daily reported estimates.  The rest of the numbers were based on previous scientific analyses, best available information and a broad range of scientific expertise.  These estimates will continue to be refined as additional information becomes available.
 

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Offshore

Teekay Petrojarl Contracts Damen for FPSO Upgrade

Damen Shiprepair Rotterdam (DSR), part of Damen Shiprepair & Conversion (DSC), has been awarded an EPC contract by Petrojarl I LLC for the upgrade of its FPSO Petrojarl I.

DNV GL Targets Safer Approach to Subsea Lifting

The completion of a joint industry project (JIP) to improve existing standards and regulations around subsea lifting operations has resulted in a new recommended practice (RP).

Polarcus Awarded 3D Project Off West Africa

Polarcus Limited has signed a letter of intent with Perenco Oil & Gas Gabon S.A. for a 3D marine seismic acquisition project offshore West Africa.   The project,

Environmental

Sekimizu Welcomes Shipper’s Revised Stance on Ballast Water

IMO Secretary-General Koji Sekimizu has welcomed the reconsideration by the International Chamber of Shipping (ICS) of its position towards the ratification by

Royal Caribbean to Install Scrubbers on 19 Ships

Royal Caribbean Cruises Ltd. (RCL) will retrofit 19 of its ships with advanced emissions purification (AEP) systems. These systems, also known as scrubbers, will

NZ Report: Human Error to Blame for Rena Grounding

New Zealand's Transport Accident Investigation Commission (TAIC) published its final report into the grounding of containership Rena in October 2011. The TAIC’s

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Offshore Oil Pod Propulsion Port Authority Ship Electronics Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.2091 sec (5 req/sec)