February 28, 2007
GCRIO Program Overview
Our extensive collection of documents.
Archives of the
Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 10, NUMBER 7, JULY 1997
OZONE DEPLETION: CHEMISTRY AND DYNAMICS
"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: firstname.lastname@example.org), 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.
"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:
email@example.com), 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.
"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
"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: firstname.lastname@example.org), M.
Natarajan et al., J. Geophys. Res., 102(D1), 1215-1228, Jan. 20,
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
"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: email@example.com), 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
Guide to Publishers
Index of Abbreviations