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Download Reactive Halogen Compounds in the Atmosphere by Peter Fabian, Onkar N. Singh PDF

By Peter Fabian, Onkar N. Singh

Clinical facts essentially exhibits that chlorine and bromine compounds, comparable to CFCs, published into the ambience are chargeable for non-stop and innovative worldwide ozone losses superimposed through dramatic seasonal ozone depletions first saw over Antarctica, now happening over Arctic areas to boot. at the present time substitutes are produced and emitted, a few of that are hugely reactive ingredients. This guide quantity offers with those reactive halogen compounds and their interactions. It presents a overview at the current wisdom in their houses, purposes, resources, sinks in addition to overseas laws.

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The amounts of the long-lived gases that are present in the atmosphere came about from many years of emissions that were 5 – 10 times more than the current emission rates. So the concentrations at present are much higher than the current emissions would suggest. With this overview in mind, we can discuss what is currently known about the individual gases that constitute the reactive chlorine budget. K. 1 Chloromethane (Methyl Chloride, CH3Cl) There are some 5 Tg of methyl chloride in the earth’s atmosphere, making it one of the largest reservoirs of gaseous chlorine.

Dichlorofluoromethane (CHCl2F ; F-21) . . . . Other Chlorinated Gases . . . . . . . . 5 Long-Lived Chlorinated Compounds (CCl2F2 , CCl3F, CCl4 , C2Cl3F3 , C2Cl2F4 , C2ClF5 , CClF3) . . . . . 62 6 New Hydrochlorofluorocarbons . . . . . . . . . . . 64 7 The Reactive Chlorine Budget . . . . . . . . . . . 65 8 Discussion and Observations . . . . . . . . . . . 73 9 References . . . . . . . . . . . . . . . . . 75 . . . . . .

75 . . . . . . . . . . . . . . . . . . 60 61 61 62 1 Introduction Much of what we know about atmospheric chlorine-containing gases has been driven by the idea, proposed more than two decades ago, that chlorine atoms can catalytically destroy stratospheric ozone. The identification of chlorofluorocarbons as one of the principal agents for transporting chlorine to the stratosphere focused attention on emissions from industrial processes and consumer goods as sources of global pollution (Molina and Rowland 1974; WMO 1985, 1988, 1989, 1991, 1995).

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