By combining detailed chemical measurements in the deep ocean, in the
oil slick, and in the air, NOAA scientists and academic colleagues have
independently estimated how fast gases and oil were leaking during the
2010 Deepwater Horizon oil spill in the Gulf of Mexico.
The new chemistry-based spill rate estimate, an average of 11,130
tons of gas and oil compounds per day, is close to the official average
leak rate estimate of about 11,350 tons of gas and oil per day (equal to
about 59,200 barrels of liquid oil per day).
"This study uses the available chemical data to give a better
understanding of what went where, and why," said Thomas Ryerson, Ph.D., a
NOAA research chemist and lead author of the study. "The surface and
subsurface measurements and analysis provided by our university
colleagues were key to this unprecedented approach to understanding an
oil spill."
The NOAA-led team did not rely on any of the data used in the
original estimates, such as video flow analysis, pipe diameter and fluid
flow calculations. "We analyzed a completely separate set of chemical
measurements, which independently led us to a very similar leak
estimate," Ryerson said.
The new study, Chemical data quantify Deepwater Horizon hydrocarbon flow rate and environmental distribution, was published online January 9 in the journal Proceedings of the National Academy of Sciences.
The new analysis follows on another NOAA-led study published last
year, in which Ryerson and colleagues estimated a lower limit to the
Deepwater Horizon leak rate based on two days of airborne data collected
during the spill and the chemical makeup of the reservoir gas and oil
determined before the spill. The new analysis adds in many other sources
of data, including subsurface and surface samples taken during six
weeks of the spill and including a direct measure of the makeup of the
gas and oil actually leaking into the Gulf.
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