Deep-sea corals disprove ocean currents' role in atmospheric CO2 rise.

A study led by the University of Bristol and Nanjing University has found that ocean currents did not contribute to the increase in global levels of carbon dioxide in the air over the past 11,000 years. The study examined deep-sea corals to shed light on the history of ocean chemistry and found that long-term polar ocean mixing between surface and deep water remained relatively stable. The researchers propose that biogeochemical cycles that redistribute nutrients and carbon in the ocean and on land may have influenced the rise in atmospheric CO2 levels during the Holocene.