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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 #d97jul29

"An Investigation of Dynamical Contributions to Midlatitude Ozone Trends in Winter," L.L. Hood (Lunar & Planetary Lab., Space Sci. Bldg., Univ. Ariz., Tucson AZ 85721; e-mail:, J.P. McCormack et al., J. Geophys. Res., 102(D11), 13,079-13,093, June 20, 1997.

Current two-dimensional stratospheric models that simulate heterogeneous chemical losses on sulfate aerosols predict total ozone trends that are significantly smaller than observed trends. This paper uses an empirical approach based on meteorological data to estimate the contribution to the observed ozone trend made by trends in stratospheric motions and temperatures. Subtracting this estimated component from the observed trend leaves a meridional trend profile that agrees more closely in latitude dependence and amplitude with 2-D model estimates.

Item #d97jul30

"A Three-Dimensional Simulation of the Antarctic Ozone Hole: Impact of Anthropogenic Chlorine on the Lower Stratosphere and Upper Troposphere," G.P. Brasseur, X.X. Tie (NCAR, POB 3000, Boulder CO 80307; e-mail:, et al., J. Geophys. Res., 102(D7), 8909-8930, Apr. 20, 1997.

Presents a new 3-D simulation which reproduces well the formation of the hole. After the breakdown of the polar vortex in December, air with depleted ozone is transported to the middle southern latitudes, resulting in a 2-4% ozone decrease at 50° S in December, and a 1% decrease in the subtropics. The model also shows that the ozone minimum observed in Antarctica several decades ago (preindustrial chlorine levels) was produced by natural dynamical processes.

Item #d97jul31

"The Atmospheric Column Abundance of IO [iodine monoxide]: Implications for Stratospheric Ozone," P.O. Wennberg (Dept. Chem., Harvard Univ., 12 Oxford St., Cambridge MA 02138), J.W. Brault et al., J. Geophys. Res., 102(D7), 8887-8898, Apr. 20, 1997.

Mass solar spectra measured at the Kitt Peak Observatory, together with laboratory data, suggest that iodine chemistry is not responsible for the reductions observed in lower stratospheric ozone during the last several decades.

Item #d97jul32

"On the Origin of Midlatitude Ozone Changes: Data Analysis and Simulations for 1979-1993," L.B. Callis (Atmos. Sci. Div., NASA-Langley Res. Ctr., MS 401B, Hampton VA 23681; e-mail:, M. Natarajan et al., J. Geophys. Res., 102(D1), 1215-1228, Jan. 20, 1997.

Analyzes ozone, temperature and aerosol records, and uses two-dimensional chemical transport simulations to understand the large declines in global (4.5%) and midlatitude (10%) ozone in the mid-1980s and during 1992 and 1993. The latter are primarily due to 1- to 2-year transport and temperature variations. The global decline is attributable to comparable contributions from solar cycle effects including relativistic electron precipitation, volcanic effects, dilution and denitrification associated with Antarctic ozone destruction, and transport and temperature effects. Trace gas effects are a fraction of these other contributions.

Item #d97jul33

"On the Magnitude of Transport out of the Antarctic Polar Vortex," W.M.F. Wauben (Royal Netherlands Meteor. Inst., Box 201, Wilhelminalaan 10, 3730 AE De Bilt, Neth; e-mail:, R. Bintanja et al., J. Geophys. Res., 102(D1), 1229-1238, Jan. 20, 1997.

The degree of isolation of the Antarctic stratospheric vortex in late winter is investigated using a three-dimensional global tracer transport model. During this period of major ozone depletion, the vortex is a fairly well isolated air mass.

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