ozone depletion


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ozone depletion

The ongoing reduction of ozone in the stratosphere. Ozone (O3) is present in 1 ppm in the upper stratosphere, and it absorbs virtually all of the UV radiation from the sun; increased rates of sun-induced malignancies (e.g., melanomas) have been attributed to the destruction of the ozone layer. Ozone depletion is caused by the release of chloride ions from CFCs (chlorofluorocarbons) after release from air conditioners, spray cans, and manufacturing plants that produce electronics and plastics. CFCs degrade in the atmosphere, release chlorine and cause ozone destruction, remain free, or react with ozone to form ClO (chlorine monoxide); O3 is being depleted at a rate of 4–5% per decade.
References in periodicals archive ?
The report stated that a 20 percent decline in ozone depletion during the winter months from 2005 to 2016 was expected.
Although warmer-than-average stratospheric weather conditions have reduced ozone depletion during the past two years, the current ozone hole area is still large compared to the 1980s, when the depletion of the ozone layer above Antarctica was first detected.
The responses of the BDC to the increased GHGs and stratospheric ozone depletion (Figure 8) show that, as expected, the tropical upward mass flux--in response to both factors--increases (Figure 8(a)), and this is accompanied by increased southern downward mass flux (Figure 8(b)) and northern downward mass flux (Figure 8(c)).
The reporting period can best be characterized as a period of transition for the GEF ozone depletion focal area.
"The ozone depletion started quite late, but when it started, it came quite rapidly," Braathen told journalists in Geneva.
Ozone depletion has been most severe at the poles, but there has been a seasonal decline of up to 10 per cent at mid-latitudes - a band covering much of North America and Europe.
For example, in the section on ozone depletion, Hill says, "However, as happens with many environmental issues, there are skeptics.
Research shows that ozone depletion also may exacerbate the effect of climate change on infectious disease as well as cause immunosuppression by altering T-cells and lymphokine production.
Other factors contributing to the problem are exposure to UV light and ozone depletion. Prevention efforts thus need to begin at earlier ages, including limiting sun exposure, using protective sunscreens, and immediate dermatological examination of unusual spots on the skin.
Ozone depletion over the North Pole reached record proportions this spring, heightening risks of UV-B radiation and sunburn as far south as Italy, according to scientists conducting a five-year assessment of Earth's ozone layer.
But nobody was hearing from them." Instead, on matters such as the banning of DDT, ozone depletion, and "global warming," the field has been dominated by "popularizers and activists with other agendas," most of whom "wallow in lavish federal funding ...