Natural nutrient enrichment 8 million years ago caused today's largest ocean 'dead zone' BostonCollege PNASNews
in ocean sediments, we can reconstruct the history of the extent of oxygen deficient zones," said Wang.of the same sediments, which reveal the ancient nutrient content in the deep Pacific Ocean, according to the report.
The sedimentary records showed the team that the largest open ocean dead zones gradually expanded over the past 8 million years, said Wang, who was joined on the project by colleagues from the Max Planck Institute for Chemistry, Princeton University, National Taiwan University, University of Toronto, Texas A&M University, University of Western Australia, and Caltech.
The researchers were struck by data that showed much lower nutrient content in the ocean prior to 8 million years ago. "In addition, terrestrial ecosystems underwent a major transition between 8 and 6 million years ago," Wang said."Many forests were replaced by less dense grassland, known as the expansion of C4 ecosystems. With more grassland, soil erosion might have increased during this period, and it would have triggered a greater transfer of organic nutrients to the ocean."
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