Abstract

On July 23, 2013 a marine gas rig (Hercules 265) ignited in the northern Gulf of Mexico. The rig burned out of control for several days before being extinguished. We conducted a rapid-response sampling campaign near Hercules 265 after the fire to ascertain if sediments and fishes were polluted above earlier baseline levels. Sediment cores were collected to the SE of the rig at a distance of ~0.2 km, 8 km and 18 km using a multicorer, and demersal fishes were collected from ~0.2 to 8 km SE of the rig using a longline (508 hooks). Recently deposited sediments document that only high molecular weight (HMW) polycyclic aromatic hydrocarbon (PAH) concentrations decreased with increasing distance from the rig suggesting higher pyrogenic inputs associated with the blowout. A similar trend was observed in the foraminifera Haynesina germanica, an indicator species of pollution. In red snapper bile, only HMW PAH metabolites increased in 2013 nearly d ouble those from 2012. Both surface sediments and fish bile analyses suggest that, in the aftermath of the blowout, increased concentration of pyrogenically-derived hydrocarbons were transported and deposited in the environment. This study further emphasizes the need for an ocean observing system and coordinated rapid-response efforts from an array of scientific disciplines to effectively assess environmental impacts resulting from accidental releases of contaminants.

Purpose

The dataset was developed to determine if the sediment and fish near the Hercules 265 marine gas rig experienced an increase in pollution after the rig suffered a blowout.

Keywords

Hercules 265 rig, polycyclic aromatic hydrocarbons, bile metabolites

UDI

R1.x135.119:0011

Date

3-18-2016 12:00 AM

Point of Contact

Romero, Isabel
University of South Florida
College of Marine Science
140 7th Ave South
St. Petersburg , FL 33701
USA
isabelromero@mail.usf.edu

Funding Source

RFP-I

Start of Data Collection

8-25-2013

End of Data Collection

8-25-2013

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