Recent disasters like the Deepwater Horizon oil spill in the Gulf of Mexico, however, have added a new element to this natural process: oil.
During these events, the natural marine snow interacts with oil and dispersants to form what's known as marine oil snow as it sinks from the surface through water column to the seafloor sediments.
Danger - Oil - Snow - Oil - Impacts
The danger with marine oil snow is that it transfers oil and its negative impacts from the water column to the sediments on the bottom of the seafloor, delivering a more diverse suite of oxygenated compounds to sediments and deep-sea ecosystems. These oxygenated forms of many oil compounds are more toxic to organisms in the sediments than are the non-oxygenated forms.
While this result may lessen the impact on near-surface organisms like fish and birds and shellfish, it transfers the oil to the deep ocean where it impacts fauna, deep corals, and fish down there, where adverse impacts were documented after the Deepwater Horizon oil spill.
University - Delaware - Andrew - Wozniak - Research
The University of Delaware's Andrew Wozniak conducted research to investigate the fate and accumulation of marine oil snow in the Gulf of Mexico, the results of which were recently published in the Environmental Science and Technology journal.
Wozniak, assistant professor in the School of Marine Science and Policy in UD's College of Earth, Ocean and Environment, conducted the research while a research faculty member at Old Dominion University. He said that to recreate the conditions of the Gulf of Mexico, he and his collaborators used 100-liter glass tanks filled with seawater collected from the Gulf.
Addition - Seawater - Plankton - Waters - Initiation
In addition to the seawater, they added plankton collected from coastal waters directly before the initiation of the experiment. They also added the kind of oil spilled during the Deepwater Horizon disaster, along with the chemical dispersant used to break it up, and monitored the tanks for four...
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