Dead Zones Recorded in Atlantic Ocean

The one of the most popular ocean Atlantic is packed with life, but for the 1st time researchers have discovered dead zones in these waters, areas low in oxygen and salinity, off the coast of Africa. A team of German and Canadian researchers have discovered areas with extremely low levels of oxygen in the tropical North Atlantic, several 100km off the coast of West Africa. Fish cannot live in the dead zones, and researchers do not understand how microorganisms will react.
This lack of picture is because of scientists stumbled upon this finding. Johannes Karstensen, of Germany’s GEOMAR Helmholtz Centre for Ocean Research Kiel, & some other scientists have studied this area of the world’s oceans about 10years. Every years, they take back and check their instrumentation.
 In 2010, Karstensen told “when we recovered our instruments, we all of the sudden saw that the typically high oxygen was very low, nearly absent. He also said “That really was remarkable for us.  1st we thought there was a problem with the sensor, but we have another instrument a small deeper, about 100m long, & also record lower values found in that range.”
Karstensen said it’s not the 1st time these Atlantic dead zones have shown up in data, other researchers wrote them off as inaccurate, outlier, a measurement error because these regions are expected to have high oxygen levels. The researchers have been conducting observations in the region off the West African coast and around the Cape Verde Islands for the past seven years, measuring not only oxygen concentrations but also water movements, temperature and salinity. They used several tools, including drifting floats that often got trapped within eddies. To measure plant growth, they used satellite observations of ocean surface colour. Only in the last few years, instruments produced high quality data to get proper oxygen readings.

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