BBC, June 2, 2010
By Finlo Rohrer
The prediction this year for the Atlantic is for an “active to extremely active” hurricane season, which officially began on 1 June.
According to the US’s National Oceanic and Atmospheric Administration, there is a 70% chance of eight to 14 hurricanes, of which between three and seven could be major hurricanes with winds of more than 111mph (179km/h).
Apart from the possibility of damage and loss of life unrelated to the oil spill, there is a very obvious downside to hurricanes passing near the source of the oil spill.
A hurricane would clearly disrupt the efforts to stop the leak, although BP has a plan to install a device in order to quickly disconnect and reconnect the link down to the spill site in high winds. On shore, tasks like the laying of boom and rescue of wildlife would become more problematic.
But what would happen to the oil that is already out there floating in the sea?
High winds and heavy seas would mix the oil and water and help the process of biodegradation, NOAA believes.
Prof Ed Overton, an environmental studies expert at Louisiana State University (LSU), agrees with this view.
“Concentrated oil in a very small area is very bad. But if you spread it out… nature can handle that. Bacteria can degrade the oil. I’m of the belief that hurricanes are Mother Nature’s dispersant.”
But there is another downside. A hurricane has the potential to take oil to places it would not otherwise reach. It all depends on the path of the storm.
“A hurricane passing to the west of the oil slick could drive oil to the coast,” the NOAA says. “A hurricane passing to the east of the slick could drive the oil away from the coast.”
This is because hurricanes rotate counter-clockwise.
To date, the weather conditions have been relatively placid out in the Gulf of Mexico.
“So far the water has been very slowly moving, almost stagnant,” says Prof Chuanmin Hu, an optical oceanographer from the University of South Florida.
But hurricanes cause storm surges. Such a surge of water has the potential not only to affect the behaviour of oil far out in the Gulf, but also to cause grim consequences when it reaches the shore.
“It is potentially not a pretty picture,” says Prof Nan Walker, an oceanographer at the School of the Coast and Environment at LSU.
“A real concern is that because Louisiana is so low-lying, even a category one storm can raise the water level eight or 10 feet.
“There is potential for oil to go fairly far inland, penetrating the marshes even deeper. It makes the problem potentially a lot worse.”
The sand berms, or barriers, that have been planned in Louisiana may not stop even a relatively small storm surge.