An unexpected hot summer or erosion may vanish marine life.
Models examining 540 million years of marine life were relatively simple and were not based on circulation in the ocean. This problem has been resolved with the new models used in the study, which can detect ocean anoxia - times when oceanic oxygen disappeared.
For the first time, this study also used a model in which the ocean was represented in three dimensions and in which ocean currents were accounted for. Results show that collapse in global water circulation leads to a stark separation between oxygen levels in the upper and lower depths. “Circulation collapse would have been a death sentence for anything that could not swim closer to the surface and the life-giving oxygen still present in the atmosphere,” Ridgwell said.
Summarizing the research theoretically, Andrew Ridgwell said that all marine life would be destroyed as a result of an unexpected hot summer or any erosion.The early evolutionary and much of the extinction history of marine animals is thought to be driven by changes in dissolved oxygen concentrations in the ocean1. In turn, [O2] is widely assumed to be dominated by the geological history of atmospheric oxygen .
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