A High-Resolution Millennial Record of the South Asian Monsoon from Himalayan Ice Cores

American Association for the Advancement of Science (AAAS) - Tập 289 Số 5486 - Trang 1916-1919 - 2000
Lonnie G. Thompson1,2, Tandong Yao3, Ellen Mosley‐Thompson1,4, M. E. Davis1,2, K.W. Henderson1,2, Ping‐Nan Lin1
1Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210 USA
2Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou, China
3Department of Geological Sciences,
4Department of Geography, The Ohio State University, Columbus, OH 43210, USA

Tóm tắt

A high-resolution ice core record from Dasuopu, Tibet, reveals that this site is sensitive to fluctuations in the intensity of the South Asian Monsoon. Reductions in monsoonal intensity are recorded by dust and chloride concentrations. The deeper, older sections of the Dasuopu cores suggest many other periods of drought in this region, but none have been of greater intensity than the greatest recorded drought, during 1790 to 1796 A.D. of the last millennium. The 20th century increase in anthropogenic activity in India and Nepal, upwind from this site, is recorded by a doubling of chloride concentrations and a fourfold increase in dust. Like other ice cores from the Tibetan Plateau, Dasuopu suggests a large-scale, plateau-wide 20th-century warming trend that appears to be amplified at higher elevations.

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We thank the many scientists engineers technicians and graduate students from the Byrd Polar Research Center and the Lanzhou Institute of Glaciology and Geocryology (China). Special thanks are extended to J. Cole-Dai and R. Edwards for anion chemistry analysis; to B. Koci the ice core driller; to V. Mikhalenko; to our mountain guides B. Vicencio M. Hipotito A. Magno and J. Albimo; and to our Sherpas Lopsang Prasal Mingma and Pasang. This work was supported by the NSF-ESH program The Ohio State University the Ohio State Committee of Science and Technology and the National Natural Science Foundation of China. This is contribution C-1169 of the Byrd Polar Research Center.

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American Association for the Advancement of Science (AAAS)

Tập 289 Số 5486

1916-1919

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