The ozone layer is thinnest near the poles.
Which country has the thinnest ozone layer?
Over the past few years, extensions of the Antarctica ozone hole have spread as far as parts of Argentina, Chile and the British-owned Falkland Islands. In 2000, measurements showed that ozone levels over a number of days were down by up to 70% – with levels dropping below 150 Dobson Units in some places.
Where is the ozone layer weakest?
Unusual weather patterns mean that ozone depletion over the Antarctic in 2019 is the weakest since records began in 1982; resulting in the smallest hole to date, according to NASA and National Oceanic and Atmospheric Administration (NOAA) scientists.
Where is the ozone layer thinning?
In the 1980s, scientists discovered that the ozone layer was thinning in the lower stratosphere, with particularly dramatic ozone loss—known as the “ozone hole”—in the Antarctic spring (September and October).
Is the ozone layer thinner over New Zealand?
Why it is important
Ozone is found in the atmosphere, particularly the middle atmosphere (stratosphere), where it absorbs ultraviolet (UV) radiation from the sun and protects Earth from being exposed to extreme UV levels. … The ozone layer over New Zealand is thickest during spring and thinnest during autumn.
Why is there no ozone layer in Australia?
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 no ozone layer in New Zealand?
In the mid 1980s, concern about the ozone layer led scientists to discover that it had been thinning over Antarctica for many years. This thinning is often called the ‘ozone hole’. … During its breakup phase in the early summer, pockets of ozone-poor air can drift to New Zealand.
Is there no ozone layer in Canada?
The ozone layer over southern Canada has thinned by an average of about 7% since the 1980s. In the late 1990s, average ozone depletion in the summer over Canada was between 3% and 7%. Ozone depletion in Canada is usually greatest in the late winter and early spring. … Large Antarctic ozone holes continue to occur.
Is the ozone layer healing 2020?
Scientists are seeing signs that the 2020 ozone hole now seems to have reached its maximum extent. … 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.
Is the ozone hole closing?
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.
How big was the ozone hole in 1985?
The maximum depth of the hole that year was 194 Dobson Units (DU)—not far below the previous historical low. For several years, the minimum concentrations stayed in the 190s, but then the minimums rapidly grew deeper: 173 DU in 1982, 154 in 1983, 124 in 1985.
What destroys the ozone layer?
II. Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere.
Is the ozone hole over Australia?
More about ozone layer depletion
The ozone layer is depleted in two ways. … This includes a five to nine per cent depletion over Australia since the 1960s, which has increased the risk that Australians already face from over-exposure to UV radiation resulting from our outdoor lifestyle.
Why is Australian sun so strong?
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.
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.
Which country has the strongest sun?
Australia is the largest, making it, some claim, the world’s sunniest country.
…
So much irradiance means various things:
- It’s a great holiday destination.
- It’s a very good place to produce solar energy.
- But, it’s also really bad for your health.
- and it means extreme weather.
8 окт. 2013 г.