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: https://www.universetoday.com/ 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).