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 8, NUMBER 9, SEPTEMBER 1995
OF GENERAL INTEREST: TREND ANALYSES
"Unusual Twentieth-Century Summer Warmth in a 1,000-Year Temperature
Record from Siberia," K.R. Briffa (Sch. Environ. Sci., Univ. E. Anglia,
Norwich NR4 7TJ, UK), P.D. Jones et al., Nature, 376(6536),
156-159, July 13, 1995.
Presents an unusually long, tree-ring-based reconstruction of mean summer
temperatures which shows that the mean temperature of the twentieth century is
higher than during any similar period since ad 914. There is no evidence for a
globally synchronous Medieval Warm Period.
"The Arctic's Shrinking Sea Ice," O.M. Johannessen (Nansen
Environ. & Remote Sensing Ctr., Edvard Griegsvei 3a, 5037
Solheimsvik/Bergen, Norway), M. Miles, E. Bjørgo, ibid., 126-127.
Microwave remotely-sensed data, for the period 1987-1994, show that the rate
of decrease in the extent of Arctic sea ice has accelerated compared to the
decrease determined from similar data for the period 1978-1987. It is too early
to say whether this represents a long-term trend.
"Precision Global Temperatures from Satellites and Urban Warming
Effects of Non-Satellite Data," J.R. Christy (Atmos. Sci. Prog., Univ.
Alabama, Huntsville AL 35899), J.D. Goodridge, Atmos. Environ., 29(16),
1957-1961, Aug. 1995.
Measurements of temperature over deep layers of the atmosphere have been
made operationally since 1978 by the Microwave Sounding Unit (MSU). Presents
methods of verifying these measurements, using comparisons to radiosonde or
independent satellite data. MSU data are precise and hence ideal for global
studies. Presents examples of how temperatures measured by surface thermometers
are unrepresentative of average trends over broad regions. The global
temperature trend of the lower troposphere measured by the MSU, from January
1979 to March 1994, is -0.06° C per decade.
"A Spatial Resampling Perspective on the Depiction of Global Air
Temperature Anomalies," S.M. Robeson (Dept. Geog., Indiana Univ.,
Bloomington IN 47405), Bull. Amer. Meteor. Soc., 76(7),
1179-1183, July 1995.
Illustrates the general problem of how spatially variable station networks
can influence estimates of climatic change, using the example of the air
temperature anomalies experienced in much of the Northern Hemisphere in 1988.
Results illustrate the importance of free and open exchange of data worldwide.
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