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Saturday, July 18, 2020 | History

2 edition of Stratospheric ozone depletion and chlorofluorocarbons found in the catalog.

Stratospheric ozone depletion and chlorofluorocarbons

United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Protection.

Stratospheric ozone depletion and chlorofluorocarbons

joint hearings before the Subcommittees on Environmental Protection and Hazardous Wastes and Toxic Substances of the Committee on Environment and Public Works, United States Senate, One hundredth Congress, first session ... May 12, 13, and 14, 1987.

by United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Protection.

  • 134 Want to read
  • 31 Currently reading

Published by U.S. G.P.O., For sale by the Supt. of Docs., Congressional Sales Office, U.S. G.P.O. in Washington .
Written in English

    Subjects:
  • Stratosphere -- United States.,
  • Chlorofluorocarbons.,
  • Ozone.

  • Edition Notes

    SeriesS. hrg -- 100-201.
    ContributionsUnited States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Hazardous Wastes and Toxic Substances.
    The Physical Object
    Paginationv, 677 p. :
    Number of Pages677
    ID Numbers
    Open LibraryOL17671148M

    Chlorofluorocarbons, or CFCs, are compounds made up of combinations of the elements chlorine, fluorine and carbon; aerosols, refrigerants and foams contain CFCs. When these CFCs enter the air, they rise up into the atmosphere to meet up with and destroy ozone molecules. First used in , CFCs have since become more common as various other CFC. Chlorofluorocarbons are responsible for the depletion of ozone layer. These are compounds which react with ozone to decompose it and thus deplete the layer. Asked in Air Pollution, Ozone Layer.

    Near the ground, ozone is an air pollutant that causes lung damage and asthma attacks. But 10 to 30 miles above the Earth’s surface ( km), ozone molecules protect life on Earth. They help shield our planet from harmful solar radiation. The ozone layer, in the stratosphere, is where about 90% of the ozone in the Earth system is found.   From World Book CD-ROM. x - Lect 24 - Rolling Motion, Gyroscopes, VERY NON-INTUITIVE - Duration: Lectures by Walter Lewin.

    Timeline of Stratospheric Ozone Depletion & Observations. 10 20 30 40 50 Observations or industry data Future projections. Natural emissions. This timeline highlights the average area of the ozone hole between September 7th and October 13th as observed by NASA spaced-based instruments (see colored bars and scale. @article{osti_, title = {Stratospheric chlorine: Blaming it on nature}, author = {Taube, G}, abstractNote = {Much of the bitter public debate over ozone depletion has centered on the claim that chlorofluorocarbons (CFCs) pale into insignificance alongside natural sources of chlorine in the stratosphere. If so, goes the argument, chlorine could not be depleting ozone as atmospheric.


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Stratospheric ozone depletion and chlorofluorocarbons by United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Protection. Download PDF EPUB FB2

Adapted for the internet from "Chlorofluorocarbons and Ozone Depletion," produced by the American Chemical Society's National Historic Chemical Landmarks program in Top of page. Research resources Further reading. Molina & Rowland paper "Stratospheric sink for chlorofluorocarbons: chlorine atom-catalysed destruction of ozone" Nature.

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.

Suggested Citation:"CAUSES AND EFFECTS OF STRATOSPHERIC OZONE DEPLETION."National Research Council. Protection Against Depletion of Stratospheric Ozone by gton, DC: The National Academies Press.

doi: / Suggested Citation:"INTRODUCTION AND SUMMARY."National Research Council. Protection Against Depletion of Stratospheric Ozone by gton, DC: The National Academies Press.

doi: / Get this from a library. Protection against depletion of stratospheric ozone by chlorofluorocarbons. [Assembly of Mathematical and Physical Sciences (U.S.).

Committee on Impacts of Stratospheric Change.; National Research Council (U.S.). Committee on Alternatives for the Reduction of Chlorofluorocarbon Emissions.]. The role of polar stratospheric clouds (PSCs) in stratospheric ozone depletion in the Antarctic polar vortex is particularly important, as discussed later.

Direct emission of the NO X free radicals into the troposphere, or formation there by the action of lightning, have little effect on the stratosphere, because rainout removes oxygen-bonded N Cited by: 65 rows  This page provides information on compounds recognized as ozone-depleting substances.

@article{osti_, title = {Ozone crisis}, author = {Roan, S.}, abstractNote = {The author presents an account of the depletion of Stratospheric ozone depletion and chlorofluorocarbons book atmosphere's ozone layer since the discovery of the phenomenon 15 years ago.

The book recounts the flight to ban chlorofluorocarbons (CFC's) and describes the science, the people, and the politics involved, up to the March international treaty. Chemists considered the reactions that create and destroy ozone as far back as in the s. However, only in the s did we start to consider the effect humans might have on the ozone particular, scientists identified man-made chlorofluorocarbons (CFCs) as.

The Chemistry of Stratospheric Ozone 3 The Distribution of Ozone in the Stratosphere 7 Anthropogenic Influence on the Stratospheric Ozone Layer 9 Increase in Halogen Source Gases in the Atmosphere 10 Upper Stratospheric Ozone Depletion 13 Polar Stratospheric Ozone Depletion 15 The Antarctic Ozone Hole 15File Size: 6MB.

NASA projection of stratospheric ozone, in Dobson units, if chlorofluorocarbons had not been banned. Animated version. Byin response to a dramatic seasonal depletion of the ozone layer over Antarctica, diplomats in Montreal forged a treaty, the Montreal Protocol, which called for drastic reductions in the production of CFCs.

Ozone Depletion The Ozone Layer Figure 1. The ozone molecule is comprised of three oxygen atoms covalently bonded. “Ozone” by UCAR (Randy Russell) is licensed under CC BY-SA. Ozone (O 3) is a gaseous molecule that occurs in different parts of the atmosphere (Figure 1).It is very reactive chemically and is dangerous to plant and animal life when present in the lower portions of the Author: Matthew R.

Fisher. Stratospheric Ozone Depletion by Chlorofluorocarbons of F. Rowland based on his knowledge of the developments in recent years about the influence of the CFCs on the ozone budget. Thanks to the restrictions that came into effect in the s, the concentrations of some CFCs in the atmosphere have already reached their maximum value; for.

data and found that stratospheric ozone had decreased greatly since the s. Inthe scientists published an article in Nature an-nouncing that stratospheric ozone over Antarctica was reduced 40% in September, the end of the austral winter.

The Antarctic ozone hole, as it came to be known, made depletion of. the ozone layer a real and File Size: KB. The ozone depletion potential of N 2 O under current atmospheric conditions is computed to be ; this value is robust because it is similar to the ozone depletion potentials for chlorofluorocarbons (e.g., CFC ) and hydrochlorofluorocarbons (e.g., HCFC ).

Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. This book describes of international efforts to protect the ozone layer, the greatest success yet achieved in managing human impacts on the global : Hemant Pathak.

Tropospheric ozone Known as the most abundant and frequently measured photochemical oxidants in the troposphere. Harmful to both plants and animals and causes respiratory inflammations such as asthma or emphysema. The Current Information Needs of the Parties.

The genesis of Scientific Assessment of Ozone Depletion: was the 23rd Meeting of the Parties to the Montreal Protocol held during 21–25 November in Bali, Indonesia, at which the scope of the scientific needs of the Parties was defined in their Decision XXIII/13 (4), which stated that: " for the report, the Scientific Assessment.

The spatial extent, degree of ozone depletion, and duration of the hole vary year-to-year, depending in part on how cold the winter and spring are; to give you an idea about the variability, in Septthe hole was one of the deepest in terms of depletion and area, while in Septit was the 2nd smallest in terms of depletion and area.

Stratospheric ozone is most concentrated between 6 and 30 miles above the Earth's surface. Ozone is a form of molecular oxygen existing predominantly in the upper atmosphere. It is continuously formed by oxygen absorbing the sun's short-wave UVC and then broken down by a number of chemicals, such as chlorine from chlorofluorocarbons (CFCs).

Stratospheric ozone depletion and chlorofluorocarbons: joint hearings before the Subcommittees on Environmental Protection and Hazardous Wastes and Toxic Substances of the Committee on Environment and Public Works, United States Senate, One hundredth Congress, first session on the effect of chlorofluorocarbons on stratospheric ozone, health effects of ozone depletion, and .E.

Measuring Ozone Depletion The most common stratospheric ozone measurement unit is the Dobson Unit (DU). The Dobson Unit is named after the atmospheric ozone pioneer G.M.B. Dobson who carried out the earliest studies on ozone in the atmosphere from the s to the s.For two decades, scientists have been warning that chlorofluorocarbons (CFCs) and halons (bromine-containing fluorocarbons) may deplete the stratospheric ozone shield that screens out some of the Sun's harmful ultraviolet rays and thus regulates the amounts which reach the Earth's surface.

CFCs have been used as refrigerants, solvents, foam Cited by: 2.