首页|Modern stalagmite oxygen isotopic composition and its implications of climatic change from a high-elevation cave in the eastern Qinghai-Tibet Plateau over the past 50 years

Modern stalagmite oxygen isotopic composition and its implications of climatic change from a high-elevation cave in the eastern Qinghai-Tibet Plateau over the past 50 years

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An oxygen isotope record of a stalagmite from Huanglong Cave in the eastern Qinghai-Tibet Plateau dated with 230Th and 210Pb methods provides variations of the Asian monsoon with an average resolution of 1 year over the past 50 years. This study shows that the δ18O of dripwater in the cave represents the annual mean δ18O of local meteoric recipitation and the stalagmites were deposited in isotopic equilibrium. A comparison of the stalagmite δ18O record with instrumentally meteorological data indicates that shifts of the δ18O are largely controlled by the amount effect of meteoric precipitation conveyed through the southwest monsoon (the indian monsoon) and less affected by emperature.Therefore, the variations of δ18O record reflect the changes in monsoon precipitation on inter-annual time scales under the influence of the southwest monsoon. Like many other stalagmite δ18O records in the Asian monsoon regions, the δ18O record of the stalagmite from Huanglong Cave also reveals a gradually enriched trend during the ast 50 years, I.e. Relatively enriched in 18O. This trend may indicate the decline of the Asian monsoon intensity which is consistent with the decrease of monsoon indices.The weakening of the modern Asian monsoon well matched with the temperature changes in stratosphere, which may illustrate that the weakening of the monsoon mainly results from the owering of solar radiation.

stalagmiteoxygen isotopic compositionAsian monsoonhigh-resolutionQinghai-Tibet Plateau

YANG XunLin、ZHANG PingZhong、CHEN FaHu、HUH Chih-an、LI HongChun、CHENG Hai、Kathleen R. JOHNSON、LIU JingHua、AN ChunLei

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CAEP,Key Laboratory of Westem China's Environmental System of Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730, China

Institute of Earth Sciences, "Academia Sinica", Taipei 115000, China

Department of Earth Sciences, ChengKung University, Tainan 700, China

Department of Geology and Geophysics, University of Minnesota, MN 55455, USA

Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK

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国家自然科学基金国家自然科学基金Doctor Station Foundation, Ministry of Education of China

4047113740421101

2007

科学通报(英文版)
中国科学院

科学通报(英文版)

SCI
ISSN：1001-6538
年,卷(期)：2007.52(9)
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