Present and future trends in the atmospheric burden of ozone-depleting halogens
Article Abstract:
An investigation of halocarbon destruction rates in the stratosphere has made it possible to relate tropospheric halocarbon burdens to the future stratospheric abundance of ozone-depleting halogens. This research was based on the recognition that bromine is 50 times more effective than chlorine in ozone-depleting reactions. The fall in the burden of ozone-depleting chemicals in the lower atmosphere results mainly from the decrease in the atmospheric load of trichloroethane. The ozone-depleting gas CBrClF2 has retarded the decline of effective equivalent chlorine more than any other halocarbon in the recent past.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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A decrease in the growth rates of atmospheric halon concentrations
Article Abstract:
A six-year record of tropospheric halon mixing ratios demonstrates that two ozone-depleting halons, H-1301 and H-1211, are diminishing in concentration. These two gases, which are released into the atmosphere primarily through use in fire extinguishers, tend both to persist for long periods and to transport large quantities of ozone-destroying bromine to the stratosphere. Fortunately, the new tropospheric measurements suggest that the levels of these halons have begun to decrease even before the year 2000 when the Montreal Protocol banning them will take effect.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Atmospheric gas concentrations over the past century measured in air from firn at the South Pole
Article Abstract:
Extraction and analysis of air from the snowpack/firn at the South Pole gives the atmospheric concentration of the biogenic greenhouse gases like methane, carbon dioxide and N2O in the twentieth century. Factors such as the composition of gas mixtures at a particular depth, release of oxygen from the air bubbles trapped in ice, molecular diffusion, and thermal gradients influence the composition of firn air. Calculations of oxygen and carbon dioxide concentrations reveal that the terrestrial biosphere has neither been a source nor sink of CO2 between 1977-1985.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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