Massive burps of carbon dioxide led to oxygen-less ocean environments in the deep past
New research from the University of California, Davis, the Chinese Academy of Sciences and Texas A&M University reveals that massive emissions, or burps, of carbon dioxide from natural earth systems led to significant decreases in ocean oxygen concentrations some 300 million years ago.
Combining geochemical analyses of sediment cores and advanced climate modeling, the study, published June 23 in Proceedings of the National Academy of Sciences, highlights five periods when significant decreases in ocean oxygen levels (by 4% to 12%) coincided with significant increases ...