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Dead zones can be classified by type, and are identified by the length of their occurrence: [16] Permanent dead zones are deep water occurrences that rarely exceed 2 milligrams per liter. Temporary dead zones are short lived dead zones lasting hours or days. Seasonal dead zones are annually occurring, typically in warm months of summer and autumn.
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.
Firstly, it occurs in coastal zones where eutrophication has driven some quite rapid (in a few decades) declines in oxygen to very low levels. [2] This type of ocean deoxygenation is also called dead zones. Secondly, ocean deoxygenation occurs also in the open ocean. In that part of the ocean, there is nowadays an ongoing reduction in oxygen ...
A dead zone is an area of water that cannot sustain aquatic life because the oxygen levels are low or depleted. The scientific term for a dead zone is called hypoxia, which in Latin means "too ...
The likely starting cause is waste nutrients being carried into the estuaries by the Mississippi River, although the oil made it worse. The dead zone appeared to be created by low amounts of oxygen in the region, known as hypoxic zones, as a result of phosphorus and nitrogen blocking out sunlight. It grows the most during the summer, when the ...
Every spring, an area appears when the water doesn't have enough oxygen to support fish and other marine life.
The oxygen concentration in the bottom layer may then become low enough for hypoxia to occur. Areas particularly prone to this include shallow waters of semi-enclosed water bodies such as the Waddenzee or the Gulf of Mexico, where land run-off is substantial. In these areas a so-called "dead zone" can be created.
Tropical weather stirred up the Gulf of Mexico, reducing this year’s dead zone off Louisiana’s coast to the third-smallest ever measured, the scientist who has measured it since 1985 said Tuesday.