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The locations of ice cores and evidence
for abrupt climate change approximately 5,000 years ago discussed
in the research are shown, along with areas of large-scale ice
retreat. Courtesy of Lonnie Thompson, Ohio State University.
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A) Retreat of the Qori Kalis glacier at
the Quelccaya ice cap from 1963 to 2005. (B) Retreat records
for six other Andean glaciers. (C) The photos document the expansion
of the proglacial lake from 1991 to 2005 as Qori Kalis retreated.
Courtesy of Lonnie Thompson, Ohio State University. |
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(A) Decadal averages of O-18 isotopes from
low-latitude, high-elevation ice fields are combined for the
last 2,000 years. The number of cores contributing to various
parts of the 2,000-year record is shown. (B and C) Also shown
are the composites for four Tibetan (B) and three Andean (C)
cores. (D) These cores are compared to the Northern Hemisphere
meteorological observations (red) back to A.D. 1860 (50) and
a multiproxy history (blue) back to approximately 200 A.D.(51).
Courtesy of Lonnie Thompson, Ohio State University. |
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The plant Distichia muscoides (dating
back 5,138 years B.P., +/- 45 years) collected at the retreating
margin of the Quelccaya ice cap in August, 2002 is compared to
the modern plant. Courtesy of Lonnie Thompson, Ohio State University.
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