High resolution stalagmite δ18O records over the past 1000 years from Dongge Cave in Guizhou

Science China Press., Co. Ltd. - 2005
He Yaoqi1, Wang Yongjin1, Kong Xinggong1, Cheng Hai2
1College of Geography Science, Nanjing Normal University, Nanjing, China
2Department of Geology and Geophysics, Minnesota University, Mineapolis, USA

Tóm tắt

Based on MC-ICP-MS U-series dating and stable O-isotope analysis results, a 4–5 years resolution monsoon record over the past 1000 years has been established for two stalagmites from Dongge Cave, Guizhou. The high resolution oxygen isotope record serves as a proxy for variations in rainfall of Asian southwest monsoon over the Yunnan-Guizhou Plateau. A close relation of the δ18O record with the Δ14C record from tree rings largely reflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuous decrease in the δ18O value at AD 1720 indicates an abrupt increase in monsoon rainfall, suggesting that an atmospheric-oceanic couple over the tropical Indian Ocean plays an important role in rapid increase of the Northern Hemisphere temperature over the last century.

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