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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 #d89oct77

"A Model Study of the Stratospheric Budget of Odd Nitrogen, Including Effects of Solar Cycle Variations," M.R. Legrand (Lab. Glaciologie & Geophys. de l'Environ., BP 96, 38402 Saint Martin d'Hères Cedex, France), F. Stordal et al., Tellus, 41B(4), 413-426, Sep. 1989.

Uses a two-dimensional diabatic circulation model of the stratosphere and the troposphere to study the budget of total odd nitrogen (NOy) and to simulate the response of odd oxygen and nitrogen species to the 11-year solar cycle variations. Results are discussed in terms of influence regions of the various NOy production processes, including surface sources (anthropogenic sources, soil exhalation), lightning, N2O oxidation, galactic cosmic rays and high-latitude input from the thermosphere and mesosphere. Found that the N2O oxidation process is the dominant odd nitrogen source throughout the stratosphere, but NOy produced within the thermosphere and transported through the stratopause at high latitude during winter may affect NOy distribution, particularly during periods of large solar activity.

Item #d89oct78

"Stratospheric HBr Mixing Ratio Obtained from Far Infrared Emission Spectra," J.H. Park (Atmos. Sci. Div., NASA Langley Res. Ctr., Hampton VA 23665), B. Carli, A. Barbis, Geophys. Res. Lett., 16(8), 787-790, Aug. 1989.

Identifies emission features of HBr isotopes in high resolution emission spectra obtained with a balloon-borne Fourier transform spectrometer in the spring of 1979 at 32° N latitude. The volume mixing ratio retrieved from the average spectrum is 2.0 x 10-11, which is assumed to be constant above 28 km, with an uncertainty of 35%. Results confirm recent observational evidence of the existence of stratospheric HBr at levels larger than previously reported.

Item #d89oct79

"Balloon Borne Observations of PSCs, Frost Point, Ozone and Nitric Acid in the North Polar Vortex," J.M. Rosen (Dept. Phys. & Astron., Univ. Wyoming, Laramie WY 82071), S.J. Oltmans, W.F. Evans, ibid., 791-794.

Studied polar stratospheric clouds (PSCs) at Alert, Northwest Territories, during January and February of 1989 with a new balloon borne instrument called a backscattersonde. Type I PSCs were observed at temperatures and pressures generally consistent with present vapor pressure models of HNO3/H2O condensate, but some noticeable inconsistencies exist. Suggests that these apparent problems, as well as some characteristic peculiarities in the PSC profiles, could be explained by the presence of two phases of the HNO3/H2O condensate.

Item #d89oct80

"Examination of Stratospheric Ozone Photochemistry in Light of Recent Data," M. Natarajan (ST Sys. Corp., 28 Research Dr., Hampton VA 23666), L.B. Callis, ibid., 16(5), 473-476, May 1989.

Examines the consistency of stratospheric ozone photochemistry using data from ATMOS and LIMS experiments in a photochemical model. When ATMOS data were used to constrain the levels of odd nitrogen and odd chlorine in the model, it yielded O3 mixing ratios that are in good agreement with observations. The updated model has also been used in conjunction with the LIMS data to simulate the stratospheric photochemistry corresponding to the 1979 time period.

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