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Science 1 December 2000:
Vol. 290. no. 5497, pp. 1747 - 1750
DOI: 10.1126/science.290.5497.1747
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Reports
Tropical Climate at the Last Glacial Maximum Inferred from Glacier Mass-Balance Modeling
Steven W. Hostetler,1
Peter U. Clark2
Model-derived equilibrium line altitudes (ELAs) of
former tropical glaciers support arguments, based on other paleoclimate data, for both the magnitude and spatial pattern of terrestrial cooling
in the tropics at the last glacial maximum (LGM). Relative to the
present, LGM ELAs were maintained by air temperatures that were 3.5°
to 6.6°C lower and precipitation that ranged from 63% wetter in
Hawaii to 25% drier on Mt. Kenya, Africa. Our results imply the need
for a ~3°C cooling of LGM sea surface temperatures in the western
Pacific warm pool. Sensitivity tests suggest that LGM ELAs could have
persisted until 16,000 years before the present in the Peruvian Andes
and on Papua, New Guinea.
1 U.S. Geological Survey, Department of
Geosciences, Oregon State University, Corvallis, OR 97331, USA. E-mail:
steve{at}ucar.edu.
2 Department of Geosciences, Oregon
State University, Corvallis, OR 97331, USA. E-mail:
clarkp{at}ucs.orst.edu
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Early Deglaciation in the Tropical Andes.
- P. U. Clark, G. O. Seltzer, D. T. Rodbell, P. A. Baker, S. C. Fritz, P. M. Tapia, H. D. Rowe, and R. B. Dunbar (2002)
Science
298, 7a-7
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- Early Warming of Tropical South America at the Last Glacial-Interglacial Transition.
- G. O. Seltzer, D. T. Rodbell, P. A. Baker, S. C. Fritz, P. M. Tapia, H. D. Rowe, and R. B. Dunbar (2002)
Science
296, 1685-1686
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