February 28, 2007
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FROM VOLUME 9, NUMBER 4, APRIL 1996
VOLCANIC IMPACTS ON TEMPERATURE
Eruptions and Global Temperatures," R.D. Thompson (Dept. Geog. Univ. of
Reading, Whiteknights, POB 227, Reading, RG6 2AB, UK),
Ambio, 24(5), 320-321, Aug. 1995.
A synopsis of existing literature on the topic, including how volcanic
eruptions are likely to be a confounding factor in detecting greenhouse warming.
Evidence of the Widespread Effects of Explosive Volcanic Eruptions," P.D.
Jones (Clim. Res. Unit, Univ. E. Anglia, Norwich NR4 7TJ, UK), K.R. Briffa, F.H.
Schweingruber, Geophys. Res. Lett., 22(11), 1333-1336, June 1,
Tree-ring evidence from 97 sites over North America and Europe is used to
develop a chronology of widespread cool summers since 1600, and to develop an
index which correlates well with known volcanic eruptions. The index shows great
potential for quantifying the climatic impact and perhaps establishing precise
calendar dates of large explosive eruptions.
Signal in Surface Temperature Observations," A. Robock (Dept. Meteor.,
Univ. Maryland, College Pk. MD 20742), J. Mao, J. Clim., 8(5,
Pt. 1), 1086-1103, May 1995.
Surface temperature records of the past 140 years show that for two years
following major volcanic eruptions, the surface cools by 0.1° - 0.2° C
in the global mean, in each hemisphere. However, in the first winter after major
tropical eruptions and in the second winter after major high-latitude eruptions,
North America and Eurasia warm by several degrees, while northern Africa and
southwestern Asia cool by more than 0.5° C. Also discusses signals from
ENSO events that have coincided with volcanic eruptions.
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