Before the emergence of the ozone hole and after (Figure study authors) The ozone hole over the South Pole can affect the amount of precipitation in the tropics. The thinning of the ozone layer causes air currents in the southern hemisphere move south, resulting in eastern Australia and the south-west Indian Ocean more rain falls.
"The residents thought that the ozone hole, located so high up in the atmosphere over Antarctica, can not affect the climate at lower latitudes — said lead author Sarah Kahn, a member of the School of Engineering at Columbia University in New York. — In fact, the domino effect has not been canceled. "
Ms. Kang and her colleagues have developed a computer model to look at the behavior of a tropical climate with a hole and without it, and compared the data with the rainfall in the band between 15 and 35? south latitude, between 1979 and 2000. Models with the ozone hole better fit the observations.
According to scientists, the shift is due to the fact that the loss of ozone causes the western atmospheric flow shifted to the south. As a result, to the south and dry air flow temperate zone and humid equatorial.
Antarctic ozone hole was first introduced in the 1980s. Since then, it occurs every spring (Southern Hemisphere), when anthropogenic chlorofluorocarbons erode the protective layer of the Earth at a height of 10 to 50 km. Other researchers have shown that this "hole" cools the upper atmosphere, affecting weather in the polar region.
In 1989, the Montreal Protocol banned chlorofluorocarbons many, and scientists expect that by mid-century, the ozone layer will recover. But the increase in the level of greenhouse gas emissions is also shifting atmospheric flows south, so global warming can resist healing, said Nathan Gillett of the organization Environment Canada.
The study is published in the journal Science.
Prepared according ScienceNews.