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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d95oct12

"Emission Measurements of the Concorde Supersonic Aircraft in the Lower Stratosphere," D.W. Fahey, . .J.C. Wilson (Dept. Eng., Univ. Denver, Denver CO 80208) et al., Science, 270(5233), 70-74, Oct. 6, 1995.

Emission indices of reactive gases and particles were determined from measurements in the exhaust plume of a Concorde cruising at supersonic speed in the stratosphere. Observation of large numbers of submicrometer particles indicates a surprisingly efficient conversion of fuel sulfur to sulfuric acid. A new fleet of supersonic aircraft with similar particle emissions would significantly increase stratospheric aerosol surface areas, and might increase ozone loss above that expected from NOx emissions alone.

Item #d95oct13

"A Global Three-Dimensional Study of the Fate of HCFCs and HFC-134a in the Troposphere," M. Kanakidou (Ctr. Faibles Radioactiv., Lab. mixte CNRS-CEA, Ave. de la Terrasse, 91198, Gif-sur-Yvette Cedex, France), F.J. Dentener, P.J. Crutzen, J. Geophys. Res., 100(D9), 18,781-18,801, Sep. 20, 1995.

Presents the first attempt to use a global, 3-D model of the troposphere to study the degradation and removal of the CFC alternatives HCFC-22, HCFC-123, HCFC-124, HFC-134a, HCFC-141b, and HCFC-142b. Maximum deposition occurs in tropical regions, associated with high oxidation rates and high rainfall. These predicted concentrations and deposition fluxes are orders of magnitude smaller than what is thought to be toxic for humans, flora and fauna.

Item #d95oct14

"Estimating the Global Ozone Characteristics During the Last 30 Years," R.D. Bojkov (Atmos. Environ. Serv., 4905 Dufferin St., Downsview ON M3H 5T4, Can.), V.E. Fioletov, ibid., 100(D8), 16,537-16,551, Aug. 20, 1995.

Summarizes the analysis of all available total ozone data from over 150 past and present Global Ozone Observing System stations, to deduce basic ozone characteristics over the period 1964-1994, both before and during the decades of drastic Antarctic ozone decline. The globally averaged ozone decline is about 5%, and is much stronger during the Antarctic spring and northern winter-spring seasons, where it has accelerated during the last 10 years.

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