MATERIAL_TYPE: weathered oil
MATERIAL: Weathered oil from the Deepwater Horizon spill
COLLECTION_LOCALITY: Gulf of Mexico
COLLECTION_LATITUDE: 28deg 53' 57.0" N
COLLECTION_LONGITUDE: 89deg 05' 50.7" W
ORIGINAL_DONOR: Gregg Swayze , USGS
CURRENT_SAMPLE_LOCATION: USGS, Denver
Sample is a water-in-oil emulsion collected from the Gulf of Mexico soon after the start of the Deepwater Horizon (Macondo-252, BP 2010) oil spill in 2010. Its oil:water ratio is 60:40 based on measurement of its oil and water components separated using heat lamp induced demulsification.
IMAGE_OF_SAMPLE:Not Available <! remove this and the ! to uncomment>
ALT="Photo of sample" width="100" height="67" border="0">
No additional compositional details available.
SPECTROSCOPIC_DISCUSSION: Spectra of seven thicknesses of the emulsion were measured: 0.025, 0.05 0.1, 0.5, 1.85, 4 and 8 mm. The spectra show C-H absorptions at 1.2, 1.7 and 2.25 microns and decreasing reflectivity and decreasing band depth for thinner emulsions. The reflectance level can vary by up to plus or minus 5% from its reported value given uncertainties in the optical configuration used to measure it.
This spectrum was published and described in:
Clark, R.N., Swayze, G.A., Leifer, I. Livo, K.E., Kokaly, R., Hoefen, T., Lundeen, S., Eastwood, M., Green, R.O., Pearson, N., Sarture, C., McCubbin, I., Roberts, D., Bradley, E., Steele, D., Ryan, T., Dominguez, R., and the Air borne Visible/Infrared Imaging Spectrometer (AVIRIS) Team, 2010, A method for quantitative mapping of thick oil spills using imaging spectroscopy: U.S. Geological Survey Open-File Report 2010-1167, 51 p.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns