A new study in ScienceAdvances finds sunlight may have cleared as much as 17% of surface oil from the Deepwater Horizon disaster.
do not vary much over a 20-nm waveband of natural sunlight. The advantage of this calculation is that it tells us the environmental exposure time that each experimental AQY, under a 20-nm LED, is directly comparable to. We selected wavelength-dependent AQYs from photon doses 1 to 4 that corresponded to ~2 to 3 weeks of natural sunlight exposure time in the summer in the GoM for a 70-μm slick.
Irradiance throughout the period of surface oiling was determined as described previously from daily fluxes of UV-B, UV-A, and PAR light that were measured from 24 April to 3 August 2010 at the Louisiana State University Central Research Station as part of the U.S. Department of Agriculture UVB Monitoring Climatological and Research Network .
Total DOC produced during the DwH spill was calculated by multiplying rates by the total areas of the thin and thick slicks on each day of surface oiling and then integrating over the 102-day period of surface oiling. Uncertainty in the DOC estimate was determined from the SDs in environmental AQYs and SDs in surface slick areas . The contributions of the uncertainties in the AQYs and the slick areas to the overall uncertainty in the DOC estimate are similar in magnitude.
All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials.
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