Ruqayyah Snyder
Australia has long been associated with high UV radiation and skin cancer rates. While the ozone hole over Antarctica has been stable or even shrinking in size over the past decade, it opened earlier and larger than usual in 2023. This has led to concerns about the potential impact on Australia, given its proximity to Antarctica and the fact that it is the largest southern landmass. While there is some ozone depletion over parts of Australia, it is important to note that the ozone hole itself does not extend over the country. The high UV radiation levels and skin cancer rates in Australia are influenced by a variety of factors, including the clean atmosphere in the southern hemisphere, the genetics of the population, and social attitudes towards sun exposure.
| Characteristics | Values |
|---|---|
| Location of the ozone hole | Over Antarctica |
| Ozone hole over Australia | No, but ozone depletion of about 5% has been observed |
| Cause of the ozone hole | Interaction between ozone-depleting substances, sunlight radiation, stratospheric clouds, and extreme cold and wind speeds of the polar vortex |
| Largest ozone hole recorded | 2023 |
| 2023 ozone hole closure date | 20 December 2023 |
| UV danger in Australia | Ever-present |
| Skin cancer cases in Australia | Almost a million cases in 2015 |
| Annual opening of the ozone hole | Around August in Antarctica |
| Peak of the ozone hole | September |
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What You'll Learn
The ozone hole is not over Australia
The ozone layer in Earth's atmosphere absorbs harmful ultraviolet light from the Sun. The hole in this layer increases the risk of sunburn and UV exposure for those in Antarctica. Australian expeditioners are at risk of UV exposure and are encouraged to take precautions such as wearing protective clothing, using sunscreen, and limiting their time outside.
Ozone depletion has resulted in a thinning of the ozone layer above Australia of about 5%. However, this has not led to a significant increase in UV exposure or skin cancer rates in the country. The high rates of skin cancer in Australia are primarily due to excessive UV radiation from the sun, which is more harmful to those with fair skin. As a result of migration, many Australians have skin that is less suited to the country's sunny climate.
The ozone hole is caused by the interaction of ozone-depleting substances, sunlight radiation, stratospheric clouds, and the extreme cold and wind speeds of the polar vortex. The world has taken steps to ban ozone-damaging chemicals, and the hole has started to repair itself. The UN's Montreal Protocol has been successful in facilitating ozone repair and mitigating climate change.
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The ozone hole is over Antarctica
While there is no ozone hole over Australia, the country does experience higher UV radiation. This is due to a thinning of the ozone layer over Australia of about 5% caused by ozone-depleting substances. This is a common misconception, as the ozone hole is, in fact, located over Antarctica.
The ozone hole over Antarctica was first observed in the early 1980s, when scientists noticed a dramatic thinning of the ozone layer over the South Pole each spring. This discovery was made through a combination of ground-based and satellite measurements. The word "hole" is used as a metaphor to describe the area where ozone concentrations drop below the historical threshold of 220 Dobson Units (DU). The deepest ozone hole occurred in 1994, when concentrations fell to just 73 DU on September 30.
The ozone hole forms due to unique meteorological conditions in Antarctica. The South Pole is part of a large land mass surrounded by the ocean, creating symmetry in the meteorological conditions. This results in the formation of very cold regions in the stratosphere over the Antarctic continent, isolated by strong winds. The low temperatures lead to the formation of polar stratospheric clouds, which promote the production of chemically active chlorine and bromine. When sunlight returns to Antarctica in September and October, rapid ozone loss occurs, resulting in the Antarctic ozone hole.
The magnitude of ozone loss has generally grown since the 1980s due to the increase in human-produced ozone-depleting compounds in the atmosphere. These compounds, such as chlorofluorocarbons (CFCs) and halons, are emitted mainly in the Northern Hemisphere. While the ozone hole has started to show signs of recovery due to efforts to reduce the use of these chemicals, it is still a significant concern. The ozone layer plays a crucial role in absorbing harmful ultraviolet light from the Sun, and its depletion has increased the risk of sunburn and other UV-related health issues for life in Antarctica.
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The ozone hole is shrinking due to the Montreal Protocol
While there is no ozone hole over Australia, the ozone layer above Australia has thinned by about five per cent due to ozone-depleting substances. The ozone layer is crucial as it filters out harmful ultraviolet radiation, which is associated with an increased prevalence of skin cancer and cataracts, reduced agricultural productivity, and disruption of marine ecosystems.
The ozone hole over Antarctica, however, has been a cause for concern. In 2023, it opened earlier and larger than usual, likely due to a volcanic eruption in the Pacific Ocean in 2022. The hole typically starts to open around August in Antarctica, peaks in September, and then reduces by December.
The good news is that the ozone hole is shrinking due to the Montreal Protocol. The Montreal Protocol on Substances That Deplete the Ozone Layer is a global agreement signed in 1987 and enforced in 1989 to phase out the production and consumption of ozone-depleting substances (ODS). ODS are substances that were commonly used in products such as refrigerators, air conditioners, fire extinguishers, and aerosols. The protocol has been amended six times, with the most recent amendment, the Kigali Amendment, calling for the reduction of hydrofluorocarbons (HFCs) in 2016. These HFCs were used as replacements for the original batch of ozone-depleting substances but were found to be powerful greenhouse gases contributing to climate change.
The Montreal Protocol has been a success, with the ozone layer well on its way to recovery. It is estimated that with the full implementation of the protocol, we can expect a near-complete recovery of the ozone layer by the middle of the 21st century. The protocol has also benefited efforts to mitigate climate change, helping to avoid global warming by an estimated 0.5°C. The United States has played a crucial leadership role in the protocol, taking strong domestic action to phase out the production and consumption of ODS.
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Australia experiences high UV radiation
Secondly, the Earth's elliptical orbit around the Sun brings it closer to the Sun during the Southern Hemisphere summer, resulting in more intense UV radiation in Australia. The Earth is around 5 million kilometres closer to the Sun in January than in July, leading to increased UV exposure in the Southern Hemisphere. This proximity to the Sun, combined with the Earth's tilt, means that regions closer to the Tropic of Capricorn, including Western Australia, the Northern Territory, and Queensland, directly face the Sun and receive more radiation during the summer.
Thirdly, the atmosphere in the Southern Hemisphere is cleaner, with less pollution from industry and less dust from land masses, allowing more UV radiation to reach the Earth's surface. The UV radiation is further reflected by the vast white surface of ice in Antarctica, enhancing its effects. Additionally, plants and trees in the Northern Hemisphere can absorb UV radiation through their leaves, reducing the amount that reaches the ground. In contrast, Australia's large forests are mostly found in the north, allowing more UV radiation to reach the southern regions.
Finally, the high UV radiation in Australia has been linked to the thinning of the ozone layer due to ozone-depleting substances. While the ozone hole over Antarctica has shown signs of recovery due to reduced use of harmful chemicals, the ozone layer above Australia has thinned by about five per cent. This thinning contributes to the high UV levels experienced in Australia, increasing the risk of sunburn, skin damage, and skin cancer.
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Australia has high skin cancer rates
Australia has the highest skin cancer rates in the world. Skin cancer is one of the most common cancers in the country, with almost a million cases recorded in 2015. The disease kills over 2,000 people each year, with more than 750,000 diagnosed and treated. It is estimated that two out of three Australians will be diagnosed with some form of skin cancer during their lifetime.
There are several factors that contribute to Australia's high skin cancer rates. One of the main reasons is the country's proximity to the equator, which results in greater sun exposure and higher-intensity UV radiation. The southern hemisphere, in general, receives more radiation than the northern hemisphere due to the Earth's elliptical orbit around the sun. In January, during the southern summer, the southern hemisphere is about 1.7% closer to the sun than in July, the northern summer. This increases UV levels by about 7%.
Additionally, Australia has a large percentage of people with fair skin, which is more vulnerable to UV radiation. The migration of Europeans with lighter skin over relatively recent historical periods has resulted in many Australians having the "wrong type of skin for their environment". The lack of protective pigmentation in fair skin leaves individuals more susceptible to the damaging effects of UV radiation.
Cultural factors also play a role in Australia's high skin cancer rates. Sun tanning has been a significant part of Australian culture, contributing to excessive sun exposure. However, public awareness campaigns, such as the Slip, Slop, Slap initiative, have helped to promote sun protection and early detection of skin cancer. These campaigns have contributed to a decrease in melanoma mortality rates.
While there is an ozone hole over Antarctica that can occasionally pass over southern Australia, the ozone depletion has not significantly impacted skin cancer rates in the country. The increase in UV exposure due to ozone depletion has been modest, and the ozone layer has started to repair itself due to the reduction of ozone-depleting substances.
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Frequently asked questions
Contrary to popular belief, the ozone hole does not extend over Australia. While the ozone hole over Antarctica has been stable or even shrinking in size over the past decade, ozone depleting substances have resulted in a thinning of the ozone above Australia by about 5%.
The ozone hole is caused by the interaction between ozone-depleting substances, sunlight radiation, stratospheric clouds, and the extreme cold and wind speeds of the polar vortex.
The ozone hole results in higher UV radiation exposure in Australia, leading to an increased risk of sunburn and skin cancer. Additionally, the ozone hole contributes to climate change and can affect weather patterns in Australia.
The 2023 ozone hole was one of the largest and longest-lived on record. While it has since closed, it exhibited unusual behaviour, persisting well into November and December. The precise reasons for its behaviour are not yet known but are attributed to climate change or volcanic emissions.
