New Zealand scientists representing the University of Otago, said that global warming and climate change in General is more dangerous to underwater creatures than is generally assumed. Experts suggest that in the future the amount of oxygen dissolved in sea water, can dramatically decrease. Last time this happened 94 million years ago.
To better understand what may threaten sea life global warming today, experts have studied the period when it has already been observed in the past. For this was analyzed the isotopes of uranium in sediments in England and Italy, the age of which, according to current estimates, is about one hundred million years.
The data obtained allowed to verify that during the Cretaceous period in the ocean, there were two so-called anoxygenic events (episodes where out of the ocean disappeared, large amounts of oxygen), and also learn some, including a rather unexpected details about the second of them. In particular, it was found that the second anoxic event took place “in two phases” between which the amount of oxygen for a while almost back to normal performance. Has also been found that reducing the amount of oxygen was accompanied by an increase in the concentration in sea water concentration of hydrogen sulfide.
Experts also note that they managed to find evidence for the relationship between global warming, increased levels of carbon dioxide in the atmosphere and a decrease in the concentration of oxygen in the ocean. All this suggests that in the future under influence of climate change this could happen again.
The study was published in the journal Proceedings of the National Academy of Sciences.
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