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New study reveals aerosol plumes downwind of the Deepwater Horizon oil spill
Date:3/10/2011

MIAMI March 10, 2011 -- Scientists from the University of Miami (UM) Rosenstiel School of Marine & Atmospheric Science were part of a national research team to find two plumes of oil-based pollutants downwind of the BP Deep Water Horizon oil spill. In a study published in this week's issue of the journal Science, the research team offers new insight into the mechanism by which the crude oil traveled from the sea surface to the atmosphere.

The National Oceanic and Atmospheric Administration (NOAA)-led research team collected data of atmosphere gas and aerosol concentrations during two flights, on June 8 and June 10, aboard a specially equipped NOAA WP-3 Orion aircraft.

"By having such a well-defined source of the evaporating oil we were able to investigate how aerosols form in the atmosphere," said UM Rosenstiel School Professor of Marine and Atmospheric Chemistry Elliot Atlas, a co-author of the paper. Atlas regularly uses similar techniques to study aerosol formation and air pollution downwind of major U.S. cities, such as Boston and Los Angeles.

The data revealed that two plumes of hydrocarbons were released into the atmosphere by the surface oil and from the smoke associated with the burning of oil during cleanup efforts. The first was a narrower three-kilometer (1.8-mile) wide hydrocarbon plume downwind of the spill site. The researchers suggest that this was the result of "direct evaporation of fresh oil on the sea surface."

The second, a larger 40-kilometer (24-mile)-wide plume, contained higher concentrations of organic aerosols and was "formed from vapors released from the oil and the condensation of their atmospheric oxidation products onto existing particles," according to the study's authors. The wider oil vapor-based plume contributed to the formation of secondary organic aerosols, which are the result of oil vapor reacting in the atmosphere. The researchers observed that methane and other light hyd
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Contact: Barbra Gonzalez
barbgo@rsmas.miami.edu
305-421-4704
University of Miami Rosenstiel School of Marine & Atmospheric Science
Source:Eurekalert  

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