High resolution stalagmite δ^(18)O records over the past 1000 years from Dongge Cave in Guizhou  

作　　者：HEYaoqi WANGYongjin KONGXinggong CHENGHai 

机构地区：[1]CollegeofGeographyScience,NanjingNormalUniversity,Nanjing210097,China [2]DepartmentofGeologyandGeophysics,MinnesotaUniversity,MineapolisMN55455,USA

出　　处：《Chinese Science Bulletin》2005年第10期1003-1008,共6页

基　　金：This work was supported by the National Outstanding Youth Foundation of China(Grant No.40225007);the 973 Project(Grant No.2004CB20204).

摘　　要：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 estab- lished 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 δ 18O record with the ?14C record from tree rings largely reflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuous decrease in the δ 18O value at AD 1720 indicates an abrupt increase in monsoon rainfall, sug- gesting 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.Based on MC-ICP-MS U-series dating and stable O-isotope analysis results, a4-5 years resolution monsoon record over the past 1000 years has been established for twostalagmites from Dongge Cave, Guizhou. The high resolution oxygen isotope record serves as a proxyfor variations in rainfall of Asian southwest monsoon over the Yunnan-Guizhou Plateau. A closerelation of the delta^(18)O record with the triangle open ^(14)C record from tree rings largelyreflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuousdecrease in the delta^(18)O 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 rolein rapid increase of the Northern Hemisphere temperature over the last century.

关 键 词：贵州 地质研究 溶洞 石笋 氧同位素 

分 类 号：P58[天文地球—岩石学]