is the ozone layer healing nasa?
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Today, 33 years later, the ozone hole is showing its first signs of recovery. Strahan and her colleague Anne Douglass published one of the first studies in 2018 confirming that atmospheric chlorine levels are falling in step with reduced ozone depletion over Antarctica — proof that the Montreal Protocol is working.
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Ozone depletion. ... This ozone "hole" develops because of the generation of reactive chlorine on the surface of ice crystals in high-altitude polar clouds. The important consequence of a hole in the ozone layer is an increased flux of UV radiation at the earth's surface and in the top layers of the ocean.
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One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere.
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One example of ozone depletion is the annual ozone "hole" over AntarcticaExit that has occurred during the Antarctic spring since the early 1980s. This is not really a hole through the ozone layer, but rather a large area of the stratosphere with extremely low amounts of ozone.
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Ozone layer depletion causes increased UV radiation levels at the Earth's surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.
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At the top of the troposphere, 12 miles high, ozone acts as a greenhouse gas, trapping heat. In the middle of the tropsohere, ozone helps clean up certain pollutants. At the bottom of the troposphere, at Earth's surface, ozone makes smog. Scientists have divided the atmosphere into different layers, each with a name.
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The "ozone hole" is a severe depletion of the ozone layer high above Antarctica. It is primarily caused by human-produced compounds that release chlorine and bromine gases in the stratosphere.
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The ozone hole is an area in the stratosphere above Antarctica where chlorine and bromine gases from human-produced chlorofluorocarbons (CFCs) and halons have destroyed ozone molecules. ... While greenhouse gases absorb heat at a relatively low altitudes and warm the surface, they actually cool the stratosphere.
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The troposphere generally extends to a level about 6 miles up, where it meets the second layer, the stratosphere. The stratosphere or "good" ozone layer extends upward from about 6 to 30 miles and protects life on Earth from the sun's harmful ultraviolet (UV) rays.
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Ground-level ozone also can reduce lung function and inflame the linings of the lungs. Repeated exposure may permanently scar lung tissue. Ground-level ozone also damages vegetation and ecosystems. In the United States alone, ozone is responsible for an estimated $500 million in reduced crop production each year.
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The sun 's ultraviolet rays are still bearing down on you. Stratospheric ozone acts as a shield by absorbing potentially harmful ultraviolet (UV) radiation which would otherwise reach the earth 's surface. But the sun 's harmful ultraviolet (UV) rays reflect off water making you burn faster.
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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.
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A new analysis of long-term atmospheric measurements by NOAA scientists shows emissions of the chemical CFC-11 are rising again, most likely from new, unreported production from an unidentified source in East Asia. The results are published today in the journal Nature .
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The Antarctic ozone hole is an area of the Antarctic stratosphere in which the recent ozone levels have dropped to as low as 33 percent of their pre-1975 values.
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HFCs may not break down ozone in the same way that CFCs do, but they do indirectly contribute to ozone depletion: HFC emissions increase the warming of the stratosphere, which speeds up the chemical reactions that destroy ozone molecules.
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TOP: The "good" ozone layer in the stratosphere protects life on Earth from the Sun's harmful ultraviolet (UV) rays. ... BOTTOM: "Bad" ozone at ground-level is harmful to breathe and damages crops, trees, and other vegetation.
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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.