The stratospheric ozone layer absorbs the biologically damaging wavelengths of ultraviolet (UV) rays but in the 1970s, Australia’s ozone layer was severely thinned as a consequence of heavy use of ozone-depleting, substances such as chloroflurocarbons (CFCs) and hydro-chloroflurocarbons (HCFCs).
Why is there less ozone in the Southern Hemisphere?
In the Southern Hemisphere, the South Pole is part of avery large land mass (Antarctica) that is completely surrounded by ocean. … This chlorine and bromine activation then leads to rapid ozone loss when sunlight returns to Antarctica in September and October of each year, which then results in the Antarctic ozone hole.
Why is there no ozone layer in New Zealand?
Ozone concentrations measured over New Zealand are not affected directly by the ozone hole, which lies over Antarctica each spring. The ozone hole is an area where the ozone layer is less than 220 DU, caused mostly by ozone-depleting substances emitted by people.
Which country is most affected by ozone depletion?
As the ozone hole over Antarctica has in some instances grown so large as to affect parts of Australia, New Zealand, Chile, Argentina, and South Africa, environmentalists have been concerned that the increase in surface UV could be significant.
Why is the ozone hole over Antarctica and not over Australia?
The severe depletion of the Antarctic ozone layer known as the “ozone hole” occurs because of the special atmospheric and chemical conditions that exist there and nowhere else on the globe. The very low winter temperatures in the Antarctic stratosphere cause polar stratospheric clouds (PSCs) to form.
Did the ozone hole closing 2020?
The record-breaking 2020 Antarctic ozone hole finally closed at the end of December after an exceptional season due to naturally occurring meteorological conditions and the continued presence of ozone depleting substances in the atmosphere.
Is the ozone layer getting better 2020?
The Montreal Protocol bans emissions of ozone depleting chemicals. Since the ban on halocarbons, the ozone layer has slowly been recovering; the data clearly show a trend in decreasing area of the ozone hole.
Why is NZ sun so strong?
In high summer, the sunshine in New Zealand is really strong. … Earth’s orbit takes it closer to the sun during the southern summer than during the northern summer. There is less pollution in the southern-hemisphere to block the UV rays. The sun’s burning strength is measured by the UV index.
Where is the thinnest ozone layer?
The ozone layer is thinnest near the poles.
Is there a hole in the ozone layer in New Zealand?
The ozone hole is situated well to the south of New Zealand. During its breakup phase in the early summer, pockets of ozone-poor air can drift to New Zealand. How can the ozone layer be repaired? As ozone-destroying chemicals are phased out, the ozone layer will eventually repair itself.
Which country has no ozone layer?
Antarctica, where ozone depletion has been most severe due to very low temperatures is expected to recover much more slowly. It’s projected that Antarctic ozone concentrations will only begin to approach 1960 levels by the end of the century.
Which country has the thickest ozone layer?
Sweden’s government weather agency reported on Friday that the ozone layer over southern Sweden reached its thickest levels at the end of last year, surpassing the previous record set in 1991.
What destroys the ozone layer?
Chlorofluorocarbons (CFCs) have been identified as the main cause of the destruction to the ozone layer, but there are also compounds containing bromine, other halogen compounds and also nitrogen oxides which cause damage.
Did we fix the ozone hole?
Is the ozone hole fixed? Yes and no. As a result of the Montreal Protocol, concentrations of ozone-depleting gases in the atmosphere have significantly declined. … We need to keep monitoring the ozone layer to check that it is recovering from the effects of CFCs,” she says.
Why is UV so high in Australia?
During summer, the Earth’s orbit brings Australia closer to the sun (as compared to Europe during its summer), resulting in an additional 7% solar UV intensity. Coupled with our clearer atmospheric conditions, this means that Australians are exposed to up to 15% more UV than Europeans.
Is there a hole in the ozone layer above Australia?
The ozone layer is depleted in two ways. Firstly, the ozone layer in the mid-latitude (e.g. over Australia) is thinned, leading to more UV radiation reaching the earth. Data collected in the upper atmosphere have shown that there has been a general thinning of the ozone layer over most of the globe.