The largest decreases in ozone took place in the high latitudes toward the polesand the smallest decreases occurred in the lower latitudes the tropics. Marked decreases in column ozone in the Antarctic spring and early summer compared to the early s and before have been observed using instruments such as the Total Ozone Mapping Spectrometer TOMS.
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. In this process, a single molecule of oxygen breaks down into two oxygen atoms. Reactions that take place on polar stratospheric clouds PSCs play an important role in enhancing ozone depletion.
Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet UV radiation coming from the sun. Since the s the loss of ozone O3 from the stratosphere has led to a small amount of negative radiative forcing of the surface.
A detailed assessment of ocular exposure to UVB was carried out in a study on Chesapeake Bay Watermen, where increases in average annual ocular exposure were associated with increasing risk of cortical opacity.
Effects of Ozone Depletion As ozone depletes in the stratosphere, it forms a 'hole' in the layer. Let us see its major impacts on human beings Skin Cancer: Antarctic ozone hole[ edit ] The discovery of the Antarctic "ozone hole" by British Antarctic Survey scientists FarmanGardiner and Shanklin first reported in a paper in Nature in May  came as a shock to the scientific community, because the observed decline in polar ozone was far larger than anyone had anticipated.
Accelerated aging of skin: However, more cooperation and understanding among all the countries is required to solve the problem completely. It plays an important role in converting atmospheric carbon dioxide into oxygen. This will result in you looking older than what you actually are.
Beginning January 1,only recycled and stockpiled CFCs were available for use in developed countries like the US. Thus, the total amount of ozone is maintained by this continuous process of destruction, and regeneration. Effects on Plants UVB radiation affects the physiological and developmental processes of plants.
Please help improve this article by adding citations to reliable sources. Ozone present in the lower atmosphere is regarded as a pollutant and a greenhouse gas, that can contribute to global warming and climate change. The most severe effects are decreased reproductive capacity and impaired larval development.
Sherwood Rowland of the University of California at Irvine recognized that human-produced chlorofluorocarbons CFCs — molecules containing only carbonfluorineand chlorine atoms—could be a major source of chlorine in the stratosphere.
These potential changes would contribute to biosphere-atmosphere feedbacks that mitigate or amplify the atmospheric concentrations of these gases. Ozone shield or ozone hole were useful "easy-to-understand bridging metaphors".
Ozone depletion affects many species at every stage of their life cycle. The most prominent decrease in ozone has been in the lower stratosphere. Ozone present in the lower atmosphere is regarded as a pollutant and a greenhouse gas, that can contribute to global warming and climate change.
They are important components of a class of refrigerants called chlorofluorocarbons CFCs that were in heavy use in the mid 20th century. Since more ozone loss occurred than could be explained by the supply of reactive chlorine available in the polar regions by known processes at that time, other hypotheses arose.
During the early s, scientists expected that stratospheric ozone levels would continue to rise slowly over subsequent decades. Natural causes of depletion of ozone layer: Ozone layer has been found to be affected by certain natural phenomena such as Sun-spots and stratospheric winds.
But this has been found to cause not more than % depletion of the ozone layer and the effects are also thought to be only temporary. Jul 02, · This quick video discusses the role of the ozone layer and how CFCs can cause ozone depletion.
Teachers: If interested, you can purchase this PowerPoint from. Reduced ozone levels as a result of ozone depletion ozone depletionA chemical destruction of the stratospheric ozone layer beyond natural reactions.
Stratospheric ozone is constantly being created and destroyed through natural cycles.
The ozone layer is a thin covering of ozone in the stratosphere. It protects the surface from the sun's UV radiation. Ozone deterioration occurs when halogen ions from CFCs interact with ozone and turn it into molecular oxygen. The result is an ozone hole that appears over the poles every year.
Ozone depletion describes two related events observed since the late s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.
Nov 19, · Ozone layer depletion, is simply the wearing out (reduction) of the amount of ozone in the stratosphere. Unlike pollution, which has many types and causes, Ozone depletion has been pinned down to one major human activity.Ozone layer deflation