Scientists have been examining the bottom of the North Sea for a while due to the almost zero life on the sea floor. More than two thirds of the bottom of the North sea are sand, leading to little oxygen being produced down blow. There has been evidence over the past few years of oxygen content decreasing, due to the little life at the bottom of the ocean, and the almost nonexistent plant life.What scientists couldn't count until now, because their technology was not advanced enough, was the little changes at the bottom of the ocean. The ripple of shells as they moved with the current. They now use a technique called the "eddy-correlation". They have found that oxygen levels change the most when the important tides come in, changing the oxygen content with movement. Shifting the sand, and creating oxygen bubbles. With this new technology, scientists can now accurately measure the North Sea's oxygen levels.
http://www.worldatlas.com/aatlas/infopage/northsea.htm
http://www.sciencedaily.com/releases/2014/10/141020105329.htm
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