each barrel = 42 gallons....
The text on this site is presented as an archival version of the script of "Ocean Planet,"
a 1995 Smithsonian Institution traveling exhibition. The content reflects the state of knowledge at the time of the exhibition, and has not been updated.The information on this buoy is divided into the three categories listed below.
* Sources
* Accidents
* Cleanups
When it comes to mixing oil and water, oceans suffer from far more than an occasional devastating spill. Disasters make headlines, but hundreds of millions of gallons of oil quietly end up in the seas every year, mostly from non-accidental sources §.
The graph below shows how many millions of gallons of oil each source puts into the oceans worldwide each year
Down the Drain: 363 Million Gallons
Used engine oil can end up in waterways. An average oil change uses five quarts; one change can contaminate a million gallons of fresh water. Much oil in runoff from land and municipal and industrial wastes ends up in the oceans. 363 million gallons §
Road runoff adds up
Every year oily road runoff from a city of 5 million could contain as much oil as one large tanker spill §.
Routine Maintenance: 137 Million Gallons
Every year, bilge cleaning and other ship operations release millions of gallons of oil into navigable waters, in thousands of discharges of just a few gallons each. 137 million gallons §
Up in Smoke: 92 Million Gallons
Air pollution, mainly from cars and industry, places hundreds of tons of hydrocarbons into the oceans each year. Particles settle, and rain washes hydrocarbons from the air into the oceans §.
Natural Seeps: 62 Million Gallons
Some ocean oil "pollution" is natural. Seepage from the ocean bottom and eroding sedimentary rocks releases oil.
Big Spills: 37 Million Gallons
Only about 5 percent of oil pollution in oceans is due to major tanker accidents, but one big spill can disrupt sea and shore life for miles §. 37 million gallons §
Crude oil from a tanker that ran aground
Kill Van Kull Channel, between Staten Island and New Jersey, 1991
photo © Michael Baytoff/Black Star
Offshore Drilling: 15 Million Gallons
Offshore oil production can cause ocean oil pollution, from spills and operational discharges §.
Accidents
Spills and slicks sicken and kill
Large spills--even though a relatively minor source of ocean oil pollution--can be devastating. The same amount of oil can do more damage in some areas than others. Coral reefs and mangroves are more sensitive to oil than sandy beaches or sea-grass beds; intertidal zones are the most sensitive. Crude oil is most likely to cause problems §.
Dead oiled otter
a victim of the Exxon Valdez spill Prince William Sound, 1989
Oil-covered fur or feathers can't insulate marine mammals and diving birds from cold water, and when an animal cleans itself, it also swallows oil.
photo © Gary Braasch/Wheeler Pictures, Woodfin Camp & Associates
NOAA scientist collects samples from a rock sole after an oil spill, 1989
Even if oil exposure isn't immediately lethal, it can cause long-term harm.
Bottom-dwelling fish exposed to compounds released after oil spills may develop liver disease and reproductive and growth problems.
photo Northwest Fisheries Science Center/National Oceanic and Atmospheric Administration
Mangroves stand in oil from a ruptured refinery tank, Panama, 1986
Smithsonian Institution scientists monitored effects of this 1986 spill, one of the largest in tropical North America. Five years later, mangrove sediments still held fairly fresh, toxic oil. It may take the mangroves fifty years to recover fully.
photo © Carl C. Hansen
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