Researchers
say this year’s "dead zone" in the Gulf of Mexico is the
largest on record.
This
week, NOAA announced that this year's dead zone is the
biggest one ever measured.
It
covers 8,776 square miles — an area the size of New Jersey.
Previous
estimates were that the dead zone would be about 6700 square miles –
federal researchers said the larger than expected zone was caused by
unusually heavy rains in the Midwest, which flushed a lot of
nutrients into the Gulf.
The
Gulf dead zone forms each spring and summer off the Louisiana and
Texas coast when oxygen levels drop too low to support most life in
bottom and near-bottom waters.
The
zone is caused by nitrates and nitrogen from fertilizer and urban
runoff flowing down the Mississippi River.
The
amount of nitrogen entering the Gulf of Mexico each spring has
increased by about 300 percent since the 1960s, mainly due to
increased agricultural runoff.
The
largest hypoxic zone measured before this year occurred in 2002 and
encompassed more than 8,400 square miles.
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