Montreal Protocol helps reduce the size of hole in Ozone
According to experts at University of Canterbury, the hole in the earth’s stratospheric ozone layer over Antarctica is recovering slowly and should close completely in the latter half of this century. However, its effect on global climate change is still uncertain.
As per researchers, the Montreal Protocol, which effectively banned chlorofluorocarbons (CFCs), had aided in reducing the size of the hole in the ozone layer. The protocol, which came into existence in 1989, is an international treaty to phase out substances believed to be responsible for ozone depletion. The scientists are of the view that if the protocol is adhered to, the ozone layer is expected to recover by 2050.
Uncertainty over the effect of Ozone Recovery
Contrary to our expectations, stratospheric ozone depletion is also believed to have indirectly protected Antarctica from the worst of greenhouse gas-related warming. The creation of ozone hole acted to change the circulation of the Southern Hemisphere so that the strong winds linked to the jet streams moved towards the pole. However, scientists are uncertain about the effect of ozone recovery on the Antarctic climate. There are views that ozone recovery should act to move the winds back towards the equator, but greenhouse gases might counteract this effect on the jet-stream positions, which help to control the width of tropical and polar weather belts.