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The effects of Hurricanes Katrina and Rita on seabed polycyclic aromatic hydrocarbon dynamics in the Gulf of Mexico |
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| Authors: | Siddhartha Mitra Joseph J Lalicata Mead A Allison Timothy M Dellapenna |
| Institution: | a Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, NY 13902-6000, United States b Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70118, United States c Department of Oceanography, Texas A&M University at Galveston, P.O. Box 1675, Galveston, TX 77553, United States |
| Abstract: | To assess the extent to which Hurricanes Katrina and Rita affected polycyclic aromatic hydrocarbons (PAH) in the Gulf of Mexico (GOM), sediment cores were analyzed in late 2005 from: a shallow shelf, a deeper shelf, and a marsh station. Sediment geochronology, fabric, and geochemistry show that the 2005 storms deposited ∼10 cm of sediment to the surface of a core at 5-12A. Bulk carbon geochemistry and PAH isomers in this top layer suggest that the source of sediment to the top portion of core 5-12A was from a relatively more marine area. Particulate PAHs in the marsh core (04 M) appeared unaffected by the storms while sediments in the core from Station 5-1B (deeper shelf) were affected minimally (some possible storm-derived deposition). Substantial amounts of PAH-laden particles may have been displaced from the seabed in shallow areas of the water column in the GOM by these 2005 storms. |
| Keywords: | Hurricanes Sediment resuspension PAH Gulf of Mexico Seabed dynamics |
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