PPT-5.6 Depletion of Stratospheric Ozone

the progression of the Ozone hole over the antarctic from 1970 to 1997 Some effects on plant and animal tissue as UV radiation increases decrease in agricultural yields and a decrease in overall forest productivity. Stratospheric ozone: the natural cycle Produced in stratosphere by dissociation of oxygen atoms exposed to short-wave radiation Reaction accounts for most of adsorption of ultraviolet sunlight () as w Q.27 T and early spring in the Antarctic is known as the “ozone hole” (see Q11). e ozone hole rst appeared over Antarc - tica because atmospheric and chemical conditions unique to this DEPLETION. What is Ozone?. Two different layers in the atmosphere:. . Troposphere. Stratosphere. . What is ozone layer?. Ozone layer is a thin, fragile shield that contains relatively high concentrations of ozone.. and verification of the connections between ozone depleting substances and the ozone hole. A.R. (Ravi) Ravishankara. NOAA, ESRL/Chemical Sciences Division. Boulder CO, USA. Co-Chair, SAP. Some . personal . 3. variability over recent decades: Stratospheric intrusions. , Asian pollution, and . climate. Meiyun Lin . Presented at Air Quality Research Subcommittee Meeting, Feb-19-2015 . Acknowledgements: . 9. th. ORM. Geneva, 14 May 2014. SAP Co-chairs. Ayit. é. -Lô. . Ajavon. (Togo). Paul Newman (USA). John Pyle . (UK). A.R. . Ravishankara. (USA). Chapter 4 of the upcoming assessment deals with “Stratospheric ozone changes and climate”.. by . David Gray. Scientific use. Background ozone. ozone present through natural or nonlocal sources. currently ranges from 20-45 ppb in North . America. Rising background ozone could mean non-attainment for much of North America. Ozone produced from the interaction of hydrocarbons and oxides in the presence of sunlight. At ground level, ozone is a pollutant; in the upper atmosphere it protects earth from excess radiation from sun. robock@envsci.rutgers.edu. http://envsci.rutgers.edu/~robock. Alan Robock. Department of Environmental Sciences. Rutgers University, New Brunswick, New Jersey. Desire for improved well-being. Consumption of goods and services. Ozone Depletion(Chapter 25). Ozone Properties. Ozone (O. 3. ). is a triatomic form of oxygen found mostly in the lower half of the atmosphere. Highly reactive strong oxidant. Tropospheric pollutant produced by photochemical reactions. Nitrous . Oxide (N. 2. O). : The Dominant Ozone-Depleting Substance Emitted in the 21. st. . Century, A. . R. . Ravishankara, John S. Daniel, and Robert W. . Portmann, . SCIENCE. , . Vol. . 326, Pages: 123-125, 2009 (OCT 2. Quick recap…. ". The ozone layer. " refers to the ozone within stratosphere. over 90% of the earth's ozone resides. Ozone is an irritating, corrosive, colourless gas with a smell. O. 3 . formed by . climate. change . in the CMIP5 models. Alexey Karpechko &. Elisa Manzini. 22.4.2013. 2. Contributions . from . many . people, . most importantly:. James Anstey,. Seok. -Woo . Son. ,. Paolo Davini,. Roy F. Baumeister. University of Queensland & . Florida State University. What is Self-Control?. Overriding responses, changing oneself. Thoughts, emotions, impulses, performance. What is Self-Control?.