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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 9, NUMBER 5, MAY 1996

PROFESSIONAL PUBLICATIONS...
OZONE DEPLETION: DISTRIBUTION & TRENDS

Item #d96may50

"Evidence for an Ozone Hole Perturbation at 30° South," V.W.J.H. Kirchhoff (Inst. Nacional de Pesquisas Espaciais (INPE), 12201-970 S, Josè dos Campos, Sao Paulo, Brazil), N.J. Schuch et al., Atmos. Environ., 30(9), 1481-1488, May 1996.

Investigates a relatively strong stratospheric column ozone decrease observed in the south of Brazil in October 1993, a time when low latitude column ozone is usually at a maximum. Satellite (TOMS) data and air trajectory analyses show a distinct link between the feature and the Antarctic ozone hole present at that time.

Item #d96may51

"A New Approach to the Characterization of Long-Term Changes in Total Atmospheric Ozone: Determination and Application of Frequency Distributions," R.A. Reck (Global Clim. Change Prog., Argonne Natl. Lab., 9700 S. Cass Ave., Argonne IL 60439), B.L. Weinberg et al., ibid., 30(14), 2627-2636, July 1996.

This new approach to determining trends, which establishes frequency distributions and then analyzes trends in extreme values, is applied to Nimbus 7 TOMS data for the midwestern U.S. The most probable values for the spring season decreased from 1979-1982 to 1989-1991. The frequency of extremely low ozone values decreased during spring from 1980-1985 to 1986-1991, while the opposite situation prevailed during fall.

Item #d96may52

"The Mid-Latitude Total Ozone Trends in the Northern Hemisphere," S. Chandra (Code 916, NASA-Goddard, Greenbelt MD 20771), C. Varotsos, L.E. Flynn, Geophys. Res. Lett., 23(5), 555-558, Mar. 1, 1996.

Analysis of 13 to 14 years of the Nimbus-7 TOMS data suggest that satellite-derived trends during winter and spring months are influenced by interannual variability associated with dynamic perturbations in the atmosphere. Such perturbations cause a large longitudinal spread in total ozone trends at mid-latitudes. By using the lower stratospheric and tropospheric temperatures as indices of dynamic variability in the trend analysis, the total ozone trends are reduced by 1% to 3% per decade; the corresponding mid-latitude trend for the winter months is - 3.7±2.5% per decade.

Item #d96may53

"Anomalies of Ozone Layer and Stratospheric Angular Momentum," E.A. Zhadin (Central Aerological Observatory, Russia), Russian Meteor. & Hydrol., No. 7, 29-34, 1995.

Calculates variations of stratospheric angular momentum from 1979 to 1992, finding a sharp increase in 1979-1980 and a downward trend in 1980-1992 at lower latitudes. Interpretation of the cause of global ozone loss is complicated by these trends in stratospheric dynamics, possible causes of which are discussed.