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The UN Environment Programme reported 146 dead zones in 2004 in the world's oceans where marine life could not be supported due to depleted oxygen levels. Some of these were as small as a square kilometer (0.4 mi 2 ), but the largest dead zone covered 70,000 square kilometers (27,000 mi 2 ).
The map indicates coastal sites where oxygen levels have declined to less than 2 mg/L (red dots), as well as expanding ocean oxygen minimum zones at 300 metres (blue shaded regions). [1] Ocean deoxygenation is the reduction of the oxygen content in different parts of the ocean due to human activities. [2] [3] There are two areas where this occurs.
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A 'dead zone' off the Gulf coast is larger than NOAA predicted. The massive area poses danger to marine life, and recovery could take decades. A 'dead zone' is growing in the Gulf of Mexico.
The Atlantic Ocean is teeming with life, but for the first time researchers have discovered dead zones in these waters - areas low in both oxygen and salinity - off the coast of Africa. Fish can't ...
Scientists prepare to collect near-bottom water aboard the R/V Pelican to verify oxygen measurements used to determine the size of the Gulf of Mexico hypoxic zone. (NOAA/LUMCON/LSU) A "dead zone ...
The dead zone encompasses nearly the entire 165,000-square-kilometre (63,700 sq mi) Gulf of Oman and equivalent to the size of Florida, United States of America. The cause is a combination of increased ocean warming and increased runoff of nitrogen and phosphorus from fertilizers. [12]
Every spring, an area appears when the water doesn't have enough oxygen to support fish and other marine life.
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