Friday , June 25 2021

Scientists uncover the causes underlying the more events Painting



Scientists think they have found a domino fall that led to the largest mass extinction Earth, and worry that a change in human-caused climate puts planet at such an uncertain path.

Some 250 million years ago, about 90 percent of marine life and 70 percent of land life became extinct in what is now called the Great Dying.

Scientists have long speculated that the massive volcanic explosions have caused a catastrophic event, but how it worked was still a little blurry.

It was not the bench. The new research journal on Thursday science I used a sophisticated computer model to build, what happened after the volcano blew: It led to the growth of ocean temperatures around 11 degrees Celsius, which are then starved of oxygen sea water.

This hot water is starved of oxygen caused mass extinction of marine, especially further away from the equator.

After the volcano blew, the level of heat trapping carbon dioxide has increased to a level more than 12 times more than today, said study lead author Justin Penn, Earth sciences researcher at the University of Washington.

The water loses oxygen when it is heated, as well as a can of cola warm exhausted, said Mr. Peng.

Scientists have looked at dozens of modern species, to see what happens to them in warmer, oxygen-starved water, and it helped them to understand the past of extinction.

One of the keys in the study & # 39 is that the more species became extinct from the equator. This is because tropical species were more acclimated to low oxygen levels, said Mr. Pan.

While people who are not heating the Earth anywhere close to as much as what happened, of course, 250 million years ago, "it puts our future in the category of applicants for this disaster," said study co-author Curtis Deutsch, scientist -Earth at Washington State University.

Ancient Extinction "shows almost exactly what lies at the end of the path we are," said Mr. Deutsch. "We really are doing the same to the climate and the Earth's oceans."

The study estimates that if carbon dioxide emissions continue to trap heat at current levels, in 2300 year, the whole globe will experience a 35 to 50 percent of the extinction level seen in Great die.

Leeds University paleontologist Paul Wignall Sun said the current global warming scenario does not provide 20-degree warming over the next few centuries, so that it could be thousands of years away.

Nevertheless, even this event is 10 percent as bad as the Great Dying «would be terrible," said Wignall, who was not part of the study.

Other outside scientists said the study provides a frightening glimpse into the possible future of the Earth.

"Because we are warming the Earth rapidly, the results of this research can be very helpful in understanding what is going on" to life in the future, the oceans, the Earth University of Southern California scientist David Bottjer said in an e-mail.


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