The formation of ozone hole in the Antarctic region has been a cause, of concern. What could be the reason for the formation of this hole?
[UPSC Civil Services Exam – 2011 Prelims]
(a) Presence of prominent tropospheric turbulence; and inflow of chlorofluorocarbons
(b) Presence of prominent polar front and stratospheric clouds; and inflow of chlorofluorocarbons
(c) Absence of polar front and stratospheric clouds; and inflow of methane and chlorofluorocarbons.
(d) Increased temperature at polar region due to global warming
Answer: (b)
Explanation:
- Winds are responsible for constantly circulating the Earth’s atmosphere worldwide, causing ozone-depleting gases to spread everywhere, including Antarctica, regardless of their origin.
- However, unique meteorological conditions in Antarctica result in these gases having a more potent impact on ozone depletion there than in any other location.
- While humans have mainly released chlorofluorocarbons (CFCs) and halons (gases containing bromine) in the Northern Hemisphere, roughly 90% of these emissions have occurred in regions corresponding to North America, Japan, Europe, and Russia.
