15 summer size giant ozone hole over Antarctica has declined by about 4 million square kilometers, which is comparable to the area of India. This was stated by experts from the University of Cambridge. Scientists have also suggested that a key role was played by the adoption of the 1987 Montreal Protocol banned the use of very dangerous for the environment substances.
The researchers, who published the results of their work in the journal Science, compared the area of the ozone hole over Antarctica in 2000 when it reached maximum size, in 2015. To do this, scientists have summarized data of observations carried out by satellites and atmospheric probes balloons. As a result, specialists that in 15 years the ozone hole has become much smaller. The process of “tightening” at times slowed, but the reason for this was, primarily, a natural process — a periodic increase in volcanic activity. In General, according to the researchers, their work for the first time enables us to confidently state that the observed positive trends.
Ozone holes represent areas of the Earth’s stratosphere, which is much thinner ozone layer (ozone — the triatomic molecule of oxygen). This layer, located at an altitude of about 10-15 kilometers, protects the Earth and its inhabitants from a significant proportion of solar radiation, therefore, the appearance of ozone holes and the ozone destruction stratophere in General, deemed to pose a significant danger.
One of the most dangerous for the ozone layer substances scientists have long recognized chlorofluorocarbons which in the past actively used in the creation of refrigerators and air conditioners, and various aerosols, including hairspray. In 1986, with evidence of this assumption was made by the American researcher Susan Solomon, and about a year later he joined the Montreal Protocol on substances that Deplete the ozone layer, which, in particular, it prohibits the use of chlorofluorocarbons. This event helped to turn the tide and see today sustainable change for the better, scientists say.Related posts: