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

FROM VOLUME 2, NUMBER 11, NOVEMBER 1989

PROFESSIONAL PUBLICATIONS...
STRATOSPHERIC CHEMISTRY

Item #d89nov35

"Rate of Formation of the ClO Dimer in the Polar Stratosphere: Implications for Ozone Loss," S.P. Sander (Jet Propulsion Lab., Calif. Inst. Tech., Pasadena CA 91109), R.R. Friedl, Y.L. Yung, Science, 245(4922), 1095-1098, Sep. 8, 1989.

Newly acquired data show slower formation rates than previously accepted; one-dimensional model calculations based on them indicate that currently accepted chemical mechanisms can quantitatively account for the observed O3 losses in late spring (17 September to 7 October). However, a qualitative assessment indicates that the existing mechanisms can only account for at most one-half of the measured O3 depletion in the early spring (28 August to 17 September), indicating perhaps additional catalytic cycles that destroy O3.

Item #d89nov36

"The Mixing Ratio of the Stratospheric Hydroxyl Radical from Far Infrared Emission Measurements," B. Carli (Inst. di Ricerca sulle Onde Elettromagnetiche del CNR, Via Panciatichi 64, 50127, Firenze, Italy), M. Carlotti et al., J. Geophys. Res., 94(D8), 11,049-11,058, Aug. 20, 1989.

Far infrared emission spectra were analyzed to retrieve the vertical distribution of the hydroxyl radical (OH). Three different methods of analysis were applied to the same data set, followed by a critical discussion of the error sources. Results were compared with theoretical predictions and results from other experiments.

Item #d89nov37

"Measurements of Stratospheric HOCl: Concentration Profiles, Including Diurnal Variation," K.V. Chance (Harvard-Smithsonian Ctr. Astrophysics, 60 Garden St., Cambridge MA 02138), D.G. Johnson, W.A. Traub, ibid., 11,059-11,069.

Presents daytime and nighttime average profiles of HOCl obtained during a balloon flight, as well as measurements on a 30-minute time scale through the sunset transition at a single altitude (35 km). Profiles were lower than the current predictions from several modeling groups by a factor of about 0.6.

Item #d89nov38

"Stratospheric Ozone Measurements from the 1985 MAP/GLOBUS NOx Campaign," D. Robbins (NASA Johnson Space Ctr., Houston TX 77058), P. Aimedieu et al., ibid., 11,074-11,087.

Measurements from nine experiments are grouped into four sets from four air masses and compared. Agreement between individual experiments and weighted mean profiles is generally within 10% and within absolute accuracies. Results of the campaign are generally consistent with those of four previous intercomparison campaigns.

Item #d89nov39

"Nitric Oxide Profiles Measured in Situ during the Globus '85 Campaign," W.A. Matthews (PEL Lauder, DSIR, Lauder, Central Otago, New Zealand), Y. Kondo et al., J. Atmos. Chem., 8(3), 229-240, Apr. 1989.

Reports on nitric oxide profiles obtained from three flights of chemiluminescent instruments. An average morning to midday NO ratio of 0.7 for the region between 26 and 33 km was obtained. This value is in good agreement with theoretical studies involving the photolysis of N₂O5 and the establishment of the NO2-NO equilibrium.