Sea Technology

MAY 2013

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centration values against which the temporal records from lander deployments can be compared. "Deepwater Horizon continues to challenge scientists and managers to better understand the deep-sea environment." appropriate settings. The principal sensors are the MIMOSA (microbial methane observatory for seafoor analysis) pore fuid pump and the chimney arrays. Designed by the Bigelow Laboratory for Ocean Sciences and the Chesapeake Biological Laboratory, MIMOSA uses an osmotic pump to slowly pull fuids through a sub-bottom probe into a long spool of polyether-ether-ketone tubing. The uptake rate is calibrated so changes in pore-fuid chemistry can be quantifed over time. The chimneys, developed by the University of North Carolina, are large-diameter polyvinyl-chloride pipes ftted with a variety of sensors. Positioned over active discharge streams, chimneys measure time-series data on methane concentrations during deployments of six months to a year. For ECOGIG, the MILET system is deployed to constrain the fne-scale spatial variability of water chemistry and seep geology. With closely spaced vent locations like those at Green Canyon 600, changing currents can match the apparent hydrocarbon concentrations by advection from varying directions. MILET can provide a range of possible con- 30 st / May 2013 Visualization as Preparation The Deepwater Horizon disaster continues to challenge scientists and managers to better understand the deep-sea environment in which future oil and gas exploration and production will occur. Monitoring the recovery of the ecosystem spurs technology development, as well as benefting ocean science and the environment. Acknowledgments This research was made possible by a grant from BP/Gulf of Mexico Research Institute. Deep-C and ECOGIG are Gulf of Mexico Research Initiative-funded consortia. The Schmidt Ocean Institute's RV Falkor was provided at no cost to ECOGIG in an ongoing program that facilitates access to the global ocean for researchers aligned with the institute's vision and mission. References For a list of references, contact Dr. Ian MacDonald at n Dr. Ian MacDonald is a professor of oceanography at Florida State University. In his research, he uses imaging and GIS techniques to investigate the ecology of deep-sea hydrocarbon seeps, primarily in the Gulf of Mexico.

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