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 11, NUMBER 3, MARCH 1998
TREND ANALYSIS: Trends in Climate System Properties
Global Solar Radiation with Increased Horizontal Visibility in Germany Between 1964 and
1990," B.G. Liepert (Lamont-Doherty Earth Observ., Rte. 9W, Palisades NY 10964;
e-mail: firstname.lastname@example.org), G.J. Kukla,J. Clim., 10(9), 2391-2401,
Global solar radiation at all sky conditions throughout much of the diurnal insolation
cycle declined at all stations except one. Results are believed to be reasonably
representative of rural, industrial and urban environments of Europe.
Two related papers
in Nature, 389(6646), Sep. 4, 1997:
"Abrupt Mid-Twentieth-Century Decline in Antarctic Sea-Ice Extent from Whaling
Records," W.K. de al Mare (Australian Antarctic Div., Dept. Environ., Channel Hwy.,
Kingston, Tasmania 7050, Australia; e-mail: email@example.com), 57-60. A decline in
the extent of Antarctic sea ice is a commonly predicted effect of a warming climate, but
evidence based on available data has been inconclusive. This paper reports an overlooked
data source, whaling records collected from 1931 to 1987, which indicates a decline of 25%
in the area covered by sea ice between the mid 1950s and the early 1970s. This abrupt
change poses a challenge to model simulations of recent climate change, and could imply
changes in Antarctic deep-water formation and in biological productivity, both important
processes affecting atmospheric CO2 concentrations.
"Icy Message from the Antarctic," E. Murphy (Marine Life Sci. Div., British
Antarctic Survey, NERC, Madingly Rd., Cambridge CB3 0ET, UK), J. King, 20-21. Comments on
the previous paper, and how it highlights concern over mechanisms involved in generating
variation and potentially rapid change in the Southern Ocean, an example of the
"unpleasant surprises in the greenhouse" heralded by Broecker (1987).
Changes in Solar Irradiance in Antarctica," G. Stanhill (Inst. Soils & Water,
Agricultural Res. Organization, Bet Dagan 50-250, Israel; e-mail:
firstname.lastname@example.org, S. Cohen,J. Clim., 10(8), 2078-2086, Aug.
Analysis of global irradiance reaching the surface in Antarctica at 12 pyranometer
stations shows a downward trend of 0.28 W m-2 per year.
Increase in H2O2 Concentration at Summit, Greenland," M. Anklin (Observatorium Davos,
Dorfstr. 33, CH-7260 Davos Dorf, Switz.; e-mail: email@example.com), R.C. Bales,J.
Geophys. Res., 102(D15), 19,099-19,104, Aug. 20, 1997.
Data from two shallow cores confirm a previously found 50% increase over the 200 years
preceding 1988. They also show a further increase since 1988, leading to an overall
increase of 60% over the last 150 years.
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