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Researchers from the National Institute for Undersea Science and Technology sailed late Tuesday on a university research ship to obtain core sediment samples from the seafloor and water samples from the water column in areas near the Deepwater Horizon spill source. They are aboard the Pelican, operated by the Louisiana Universities Marine Consortium, which departed from Cocodrie, La.<\/p>\n
The team collected its first samples at midday Wednesday and will continue doing so for several days before returning to port Sunday. The samples are expected to provide important information about the abundance of marine organisms and the presence of chemicals in ocean water and sediments – information for a baseline against which to measure change if those areas are affected by sinking oil.<\/p>\n
The ship had been outfitted and ready to support a different NOAA-funded mission: to explore for deep-sea corals and hydrate communities associated with natural gas and oil seeps in the seafloor as well as mud volcanoes and shipwrecks of historical interest. That mission, which would have gone to an area in the Gulf not affected by the spill, was scrubbed in favor of gathering timely and much-needed data close to the spill’s source.<\/p>\n
“We plan to sample as close to the well head as is safe, reasonable and allowable,” said Ray Highsmith, executive director for NIUST and principal investigator for both the original and revised mission. “We then plan to travel northwestward toward our long-term study site at MC-118, with stops for sampling, and then likely, sample northward from MC-118.”<\/p>\n
MC-118 stands for “Mississippi Canyon Block 118,” an area about nine miles from the oil spill’s source and the site of the Gulf of Mexico Consortium’s Methane Hydrate Seafloor Observatory. In the seven years of the observatory’s development, scientists have collected a wealth of geologic, physical, chemical and biological data describing the area – data that could be important in measuring changes there that stem from the spill.<\/p>\n
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Click the thumbnails to enlarge photos<\/strong><\/p>\n With NOAA’s agreement to change missions, scientists and technicians on the ship and ashore worked quickly to adjust staffing and to remove NIUST’s two autonomous undersea vehicles from the ship. The AUVs would not have the appropriate sample-collecting capability onboard for the spill-related mission and would not work well in an oiled environment.<\/p>\n The research team brought aboard a large box corer used to take sediment samples from the seafloor and installed a large reel of cable to allow the corer to operate at depths equal to the spill source at 5,000 feet. An instrument called a CTD (Conductivity-Temperature-Depth) will measure the water’s salinity, temperature, density and oxygen concentration at various water column depths, while bottles on the CTD obtain water samples.<\/p>\n
NIUST is a partnership of the University of Mississippi, University of Southern Mississippi and NOAA, funded by NOAA’s Office of Ocean Exploration and Research. Samples from the mission will be studied by NOAA and by labs at the universities of Georgia and North Carolina and other members of the Hydrates Research Consortium.<\/div>\n