Because of their relative stability, CFCs rise into the stratosphere where they are eventually broken down by ultraviolet (UV) rays from the Sun. The scientists have observed reduction in stratospheric ozone since early 1970’s. The troposphere is closest to the Earth. The free oxygen atom (O), then combines with an oxygen molecule (O2), and forms a molecule of ozone (O3). And More…, Episode 698: Open Space 95: Would SpaceX Have Survived without NASA? This website uses cookies to improve your experience while you navigate through the website. The Montreal Protocol is an international agreement to address the causes of ozone depletion. The chlorine reacts with oxygen which leads to the chemical process of destroying ozone molecules. Ultraviolet radiations (UVR), are high energy electromagnetic waves emitted from the Sun. All the while they are destroying ozone molecules. Well, we're looking for good writers who want to spread the word. Ozone layer depletion ppt 1. Thus, the total amount of ozone is maintained by this continuous process of destruction, and regeneration. In some species of plants, UV radiation can alter the time of flowering, as well as the number of flowers produced by a plant. Chlorofluorocarbons (CFCs) have been identified as the main cause of the destruction to the ozone layer, but there are also compounds containing bromine, other halogen compounds and also nitrogen oxides which cause damage. These cookies do not store any personal information. And More…, Episode 691: Interview: Seth Shostak from the SETI Institute, Creative Commons Attribution 4.0 International License. These cookies will be stored in your browser only with your consent. Our individual efforts can go a long way in saving the Earth’s blanket. Astronomy Cast offers a good episode that describes what could happen if we lose enough of our ozone. However, various factors have led to the depletion and damage of this protective layer., Our Book is out! The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Marine phytoplankton play a fundamental role in both the food chain as well as the oceanic carbon cycle. 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603. Ozone depletion and its causes. Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. See no ads on this site, see our videos early, special bonus material, and much more. Causes: chlorofluorocarbon (CFCs), halons, and other compounds deplete the ozone layer.These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Find out what caused the ozone hole, and how the 1989 Montreal Protocol sought to put an end to ozone depletion. The oxygen atom (O), recombines with the oxygen molecule (O2) to regenerate an ozone (O3) molecule. Both come from the breaking down of chloroflourocarbons(freons) by photons in the atmosphere. Copyright © Help Save Nature &, Inc. At the same time, increase in the level of ozone in the lower atmosphere can enhance the ability of sunlight to synthesize vitamin D, which can be regarded as an important beneficial effect of ozone layer depletion. They have been … As ozone depletes in the stratosphere, it forms a ‘hole’ in the layer. Necessary cookies are absolutely essential for the website to function properly. The first one has been a slow, but steady ozone depletion of 4% per decade of the Earth’s stratosphere(ozone layer). There are many causes for ozone depletion, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. There is a good article about the causes of ozone depletion and the Montreal Protocol at this link. Atmospheric and Climate Sciences, 2016, 6, … More stories at: The atmosphere extends a few hundred kilometres above the Earth. His newest book is called the Biological Universe, and features the search for life in the Milky Way and Beyond. Chad Weber – [email protected], Support Universe Today podcasts with Fraser Cain. This category only includes cookies that ensures basic functionalities and security features of the website. These chemicals are widely known as ODS, an acronym for Ozone-Depleting Substances. The ozone layer refers to a region of Earth's stratosphere that absorbs most of the Sun's UV radiation. The Montreal Protocol is an international agreement to address the causes of ozone depletion. Since the early 1970's, scientists observed reduction in stratospheric ozone and it was found more prominent in Polar Regions. These are often found in vehicle emissions, byproducts of industrial processes, refrigerants, and aerosols. Stratospheric ozone depletion causes a negative radiative forcing, while increases in tropospheric ozone cause a positive radiative forcing (see Figure Q18-1).