An overview of the ozone depletion process

Using this information, a recent risk assessment has estimated that, in the absence of the Montreal Protocol, elevations in UV due to ozone depletion would lead to skin cancer incidences as high as four times the current levels by the end of the next century.

Although less direct than trend detection by surface UV measurements, the credibility of such model-based calculations has been greatly reinforced by the good agreement with direct UV measurements over shorter time scales, as described above.

Thus, higher UVB exposure raises human vitamin D in those deficient in it. This reduced loss of water was attributed to thicker wax layers on leaf surfaces that developed under elevated UV-B. In laboratory analytics a former "essential" use the ozone depleting substances can be replaced with various other solvents.

James Lovelock had recently discovered, during a cruise in the South Atlantic inthat almost all of the CFC compounds manufactured since their invention in were still present in the atmosphere. Other Effects Another observation is an increase in the ozone present in the lower atmosphere due to the decrease in the ozone in the stratosphere.

Short-wavelength UV radiation splits an oxygen O 2 molecule into two oxygen O atoms, which then combine with other oxygen molecules to form ozone.

Early models failed to take PSCs into account and predicted a gradual global depletion, which is why the sudden Antarctic ozone hole was such a surprise to many scientists. There are three types of PSC clouds—nitric acid trihydrate clouds, slowly cooling water-ice clouds, and rapid cooling water-ice nacerous clouds—provide surfaces for chemical reactions whose products will, in the spring lead to ozone destruction.

Plastics generally include flame-retardants and other additives to ensure processibility and performance, and their effect on the photodegradability of the polymer is of practical interest.

Recent studies of peat-forming mosses, which are very important in global carbon storage, are not indicating reduced biomass accumulation under increased UV-B radiation. Dissolved organic material DOM as well as particulate organic material POM significantly influence the penetration of UV-B in natural waters with absorption strongly increasing at shorter wavelengths.

Constant exposure to UV radiation can cause photo allergy, which results in the outbreak of rashes in fair-skinned people. This eventually disturbs and affects the entire ecosystem.

Moreover, the polar vortex formed over Antarctica is very tight and the reaction occurring on the surface of the cloud crystals is far different from when it occurs in atmosphere. The oxygen atom then joins up with an oxygen molecule to regenerate ozone.

These low temperatures form cloud particles.

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The CFCs are so stable that only one process breaks them down: Effects of Ozone Depletion As ozone depletes in the stratosphere, it forms a 'hole' in the layer. ClO is produced by the reaction of Cl with ozone—its observation thus demonstrated that Cl radicals not only were present in the stratosphere but also were actually involved in destroying ozone.

Such measurements are important contributions to the development of a global land-based UV climatology. The lack of sunlight contributes to a decrease in temperature and the polar vortex traps and chills air.

The role of sunlight in ozone depletion is the reason why the Antarctic ozone depletion is greatest during spring. Another factor that may prolong ozone depletion is the drawdown of nitrogen oxides from above the stratosphere due to changing wind patterns. The process continues, and this results in the depletion of the ozone layer.

Ozone depletion

Effects of Ozone Depletion As ozone depletes in the stratosphere, it forms a 'hole' in the layer. The process continues, and this results in the depletion of the ozone layer. Effects of Ozone Depletion As ozone depletes in the stratosphere, it forms a 'hole' in the layer.

the ozone depletion process Q6: What are the principal steps in stratospheric ozone depletion caused by human activities? The initial step in the depletion of stratospheric ozone by human activities is the emission of ozone-depleting. The emission of ozone depleting substances has been damaging the ozone layer.

But through domestic and international action, the ozone layer is healing and should fully recover by about This website addresses stratospheric ozone issues, including the science of ozone depletion, EPA's regulatory approach to protecting the ozone layer, EPA-approved alternatives to ozone-depleting substances.

the ozone depletion process Q6: What are the principal steps in stratospheric ozone depletion caused by human activities? The initial step in the depletion of stratospheric ozone by human activities is the emission of ozone-depleting.

This summary is the last one between the full assessments of and on environmental effects of ozone depletion. The aim is to keep the Parties to the .

An overview of the ozone depletion process
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Ozone Layer Protection | US EPA