I was part of a team that recently discovered human-made pollutants in one of the deepest and most remote places on Earth – the Atacama Trench, which goes down to a depth of 8,000 meters (26,246 feet) in the Pacific Ocean.
in one of the deepest and most remote places on Earth – the Atacama Trench, which goes down to a depth of 8,000 meters in the Pacific Ocean.
However, because they take decades to break down, PCBs can travel long distances and spread to places far from where they were first used, and they continue to circulate through ocean currents, winds, and rivers.took place in the Atacama Trench, which tracks the coast of South America for almost 6,000 kilometers . Its deepest point is roughly as deep as the Himalayas are high.
When plankton die, their cells sink to the bottom, carrying with them pollutants such as PCBs. But PCBs don't dissolve well in water and instead prefer to bind to tissues rich in fat and other bits of living or dead organisms, such as plankton. We found that the organic carbon at the deepest locations in the Atacama Trench was more degraded than at shallower places. At the greatest depths, there were also higher concentrations of PCB per gram of organic carbon in the sediment.
Typically, the highest concentrations are found in lower layers of sediment that were deposited in the 1970s through to the 1990s, followed by a decrease in concentrations towards the surface, reflecting the ban and reduced emissions of PCBs.
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