Program and Agenda

Abstract

EXXON VALDEZ OIL AFTER 23 YEARS ON ROCKY SHORES IN THE GULF OF ALASKA: BOULDER ARMOR STABILITY AND PERSISTENCE OF SLIGHTLY WEATHERED OIL

Twenty-three years after the 1989 Exxon Valdez, spill, oil deposited as mousse persists on rocky shores of national parks in the Gulf of Alaska, distant from the spill origin. Oil persistence is highly dependent on the stability of the boulder armors, some of which have remained intact for 20+ years. Surface oiling has declined to very low levels while subsurface oiling continues relatively unchanged at 4 of the 6 sites. Deployment of passive samplers at 2 sites revealed that some oil constituents are moving into the water. At 4 sites, the oil is only slightly weathered. Comprehensive two-dimensional gas chromatographic (GC x GC) analyses have significantly increased the discrimination of oil compounds; especially pertinent is enhanced resolution of biomarkers, useful for the identification of oil source. Thin-layer chromatography-flame ionization detection analyses indicate no significant accumulation of recalcitrant oxygenated hydrocarbons at 4 of the sites, consistent with only minor oil weathering.

ePoster:

Authors

Irvine, G. V., U.S. Geological Survey, USA, gvirvine@gmail.com

Mann, D. H., University of Alaska, Fairbanks, USA, dhmann@alaska.edu

Carls, M., NOAA, Auke Bay Laboratories, USA, mark.carls@noaa.gov

Reddy, C., Woods Hole Oceanographic Institution, USA, creddy@whoi.edu

Nelson, R. K., Woods Hole Oceanographic Institution, USA, rnelson@whoi.edu

Details

Poster presentation

Session #:047
Date: 2/26/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 1173