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Climatic Change

, Volume 59, Issue 1–2, pp 137–155 | Cite as

Tropical Glacier and Ice Core Evidence of Climate Change on Annual to Millennial Time Scales

  • Lonnie G. Thompson
  • Ellen Mosley-Thompson
  • M. E. Davis
  • P.-N. Lin
  • K. Henderson
  • T. A. Mashiotta
Article

Abstract

This paper examines the potential of the stable isotopic ratios, 18O/16O (δ 18Oice)and 2H/1H (δ Dice), preserved in mid to low latitude glaciers as a toolfor paleoclimate reconstruction. Ice cores are particularly valuable as they contain additional data, such as dust concentrations, aerosol chemistry, and accumulation rates, that can be combined with the isotopic information to assist with inferences about the regional climate conditions prevailing at the time of deposition. We use a collection of multi-proxy ice core histories to explore the δ 18O-climate relationship over the last 25,000 years that includes both Late Glacial Stage (LGS) and Holocene climate conditions. These results suggest that on centennial to millennial time scales atmospheric temperature is the principal control on the δ 18Oice of the snowfall that sustains these high mountainice fields.Decadally averaged δ 18Oice records from threeAndean and three Tibetan ice cores are composited to produce a low latitude δ 18Oice history for the last millennium. Comparison ofthis ice core composite with the Northern Hemisphere proxy record (1000–2000A.D.) reconstructed by Mann et al. (1999) and measured temperatures(1856–2000) reported by Jones et al. (1999) suggests the ice cores have captured the decadal scale variability in the global temperature trends. These ice cores show a 20th century isotopic enrichment that suggests a large scale warming is underway at low latitudes. The rate of this isotopically inferred warming is amplified at higher elevations over the Tibetan Plateau while amplification in the Andes is latitude dependent with enrichment (warming) increasing equatorward. In concert with this apparent warming, in situobservations reveal that tropical glaciers are currently disappearing. A brief overview of the loss of these tropical data archives over the last 30 years is presented along with evaluation of recent changes in mean δ18Oice composition. The isotopic composition of precipitation should be viewed not only as a powerful proxy indicator of climate change, but also as an additional parameter to aid our understanding of the linkages between changes in the hydrologic cycle and global climate.

Keywords

Stable Isotopic Ratio Proxy Record Paleoclimate Reconstruction Regional Climate Condition Millennial Time Scale 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Lonnie G. Thompson
    • 1
  • Ellen Mosley-Thompson
    • 2
  • M. E. Davis
    • 3
  • P.-N. Lin
    • 4
  • K. Henderson
    • 3
  • T. A. Mashiotta
    • 4
  1. 1.Department of Geological Sciences and Byrd Polar Research Center, Ohio State University, ColumbusU.S.A.
  2. 2.Department of Geography and Byrd Polar Research Center, Ohio State University, ColumbusU.S.A
  3. 3.Department of Geological Sciences and Byrd Polar Research Center, Ohio State University, ColumbusU.S.A
  4. 4.U.S.A

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