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 5, NUMBER 11, NOVEMBER 1992
TREND ANALYSIS: TROPOSPHERIC COMPOSITION
"Changing Sources of Impurities to the Greenland Ice Sheet over the
Last 250 Years," P. Laj (Lab. Glaciol., Domaine Univ., BP 96, 38402 St.
Martin d'Hères Cedex, France), J.M. Palais, H. Sigurdsson, Atmos.
Environ., 26A(14), 2627-2640, Oct. 1992.
Measurements of major ions in nine sections of a central Greenland ice core
show that concentrations of SO42- and NO3- have increased up to three or four
times the 18th-century levels, and large changes have also occurred in species
such as NH4+, excess Cl, and Ca+. Anthropogenic inputs have clearly modified the
behavior of several chemical compounds in the atmosphere.
"Variations in Surface Ozone Trends over Europe," P.S. Low
(Ozone Secretariat, UNEP, POB 47074, Nairobi, Kenya), P.M. Kelly, Geophys.
Res. Lett., 19(11), 1117-1120, June 2, 1992.
Data from remote, rural, suburban and urban stations show no dominant
region-wide trend over 1978-1988, although there is some common behavior on a
subregional scale. The short-term variability evident in this study suggests it
may be misleading to draw conclusions concerning long-term trends from records
of limited duration.
"Model Calculations of Nighttime Atmospheric OH," Y. Lu (Global
Change Res. Ctr., Oregon Graduate Inst., Beaverton OR 97006), M.A.K. Khalil,
Tellus, 44B(2), 106-113, Apr. 1992.
Nighttime OH concentrations may have decreased significantly between ice-age
and preindustrial, and between preindustrial and present times, although daytime
concentrations did not vary much during these transitions.
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