February 28, 2007
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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 1, NUMBER 4, OCTOBER 1988
"Measurements of Atmospheric BrOx Radicals in the Tropical
and Mid-Latitude Atmosphere," O.N. Singh (Dept. Appl. Phys., Benares Hindu
Univ., Varanasi, India), R. Borchers et al., Nature, 334(6183),
593-595, Aug. 18, 1988.
Catalytic decomposition of ozone by bromine radicals (BrOx) is more
efficient than by chlorine radicals (ClOx) and could be enhanced by synergistic
effects of BrOx and ClOx. First vertical profiles of CBrClF2 and CBrF3, two
important source gases of atmospheric BrOx, were measured respectively during
1982-84 and 1980 at 44° N. Comparison with 1987 data shows that the
atmospheric abundances of CBrClF2 and CBrF3, at present about 2 pptv and 1.3
pptv, are growing by 12% per year and 5% per year respectively.
"Toward an Improved Global Network for Determination of Tropospheric
Ozone Climatology and Trends," R.G. Prinn (Dept. Earth, Atmos., Planetary
Sci., Mass. Inst. Tech., Cambridge MA 02139), J. Atmos. Chem., 6,
An examination of typical tropospheric ozone variability on daily, monthly,
annual and interannual timescales and of instrumental precision indicates that
the current ozonesonde network is insufficient to detect a trend in tropospheric
ozone of £ 1% per year at the 2 sigma level, even at stations with records
a decade in length. A trend prediction analysis indicates it is possible to
achieve this by decreasing the time between observations from 3-7 days to one
day or less, doubling the present number of stations, and using differential
absorption lidar ozone instruments which can make far more frequent measurements
of ozone vertical profiles.
Comment and reply on "Further Interpretation of Satellite
Measurements of Antarctic Total Ozone," Geophys. Res. Letters.,
15(2), 196-199, Feb. 1988.
"Observational Assessments of the Hemispheric and Global Climate
Response to Increasing Greenhouse Gases," C.-D. Schönwiese (Inst.
Meteor. Geophys., Univ. Frankfurt/M., FRG), Beitr. Phys. Atmos., 60(1),
48-64, Feb. 1987.
To be able to detect any anthropogenic greenhouse effect as early as
possible in the observational data, the air temperature record (near surface,
land areas) for both hemispheres and the global average, sea surface
temperatures, and globally averaged sea level variations were analysed over the
recent 100-130 years. A multivariate regression model was used which accounts
for CO2, volcanic and solar forcing and tropical Pacific temperatures reflecting
the El Niño events. Concludes there are some signs of trace gas induced
climate change that are consistent with available GCM predictions, but this
interpretation is complicated by several factors such as possible nonlinearity
and time lags.
"Relative Contributions of Different Trace Gases to the Greenhouse
Effect," T.M.L. Wigley (Clim. Res. Unit, Univ. East Anglia, Norwich NR4
7TJ, UK), Clim. Monitor, 16(1), 14-28, Dec. 1986-Feb. 1987.
Updates information on concentrations and radiative effects to quantify the
relative contributions of the various greenhouse gases both in the past and,
based on recent projections, in the future, to the year 2030.
"Surface Ozone Concentrations and Climate: Preliminary Analysis,"
T.D. Davies, P.M. Kelley et al., Clim. Monitor, 16(2), 52-61,
Records of surface ozone concentrations in parts of Europe have increased in
recent decades. There is a close association from year to year between ozone
values and a measure of the circulation character over the U.K. based on the
Lamb weather type classification. Future changes in the circulation, including
those which may result from greenhouse gas concentration changes, could have a
noticeable effect on local to regional-scale ozone levels.
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Index of Abbreviations