Relationships between the Oxygen Isotopes in East Asian Stalagmites and Large-Scale Atmospheric and Oceanic Modes  

作　　者：JING Yuan-Yuan LI Shuanglin WAN Jiang-Hua LUO Fei-Fei 

机构地区：[1]Institute of Atmospheric Physics,Chinese Academy of Sciences [2]College of Atmospheric Sciences,Chengdu University of Information Technology

出　　处：《Atmospheric and Oceanic Science Letters》2014年第6期540-545,共6页大气和海洋科学快报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA11010401);the National Natural Science Foundation of China (Grant No. NSFC41375085)

摘　　要：The stalagmite δ18O record is known to be associated with the climate, but the specifics of the relationship remain unclear. It may not represent variation in air temperature or precipitation, but instead reflect integral changes of monsoon circulation, especially water vapor sources(the so-called "circulation effect"). Since large-scale atmospheric-oceanic modes such as the Atlantic Multidecadal Oscillation(AMO), Pacific Decadal Oscillation(PDO), and North Atlantic Oscillation(NAO) exert significant effects on Asian monsoon, in this paper the authors investigate the relationships of the East Asian stalagmite δ18O record with these modes. The last three centuries form the focus of our study, for which the authors use reconstructed as well as instrumental data. Considering the impacts of human activity, our analysis is conducted with respect to two periods—the pre- and post-industrial periods. The results show significant lead-lag connections: a positive correlation peaks when the PDO leads East Asian stalagmite δ18O by 3 years, which is persistent over the past 300 years; while the relationships of the AMO and NAO with the East Asian stalagmite δ18O record show significant differences in the post-industrial relative to the pre-industrial period. This implies that the East Asian stalagmite δ18O record may primarily reflect the PDO signal.The stalagmite δ18O record is known to be associated with the climate, but the specifics of the relationship remain unclear. It may not represent variation in air temperature or precipitation, but instead reflect integral changes of monsoon circulation, especially water vapor sources（the so-called ＂circulation effect＂）. Since large-scale atmospheric-oceanic modes such as the Atlantic Multidecadal Oscillation（AMO）, Pacific Decadal Oscillation（PDO）, and North Atlantic Oscillation（NAO） exert significant effects on Asian monsoon, in this paper the authors investigate the relationships of the East Asian stalagmite δ18O record with these modes. The last three centuries form the focus of our study, for which the authors use reconstructed as well as instrumental data. Considering the impacts of human activity, our analysis is conducted with respect to two periods—the pre- and post-industrial periods. The results show significant lead-lag connections： a positive correlation peaks when the PDO leads East Asian stalagmite δ18O by 3 years, which is persistent over the past 300 years; while the relationships of the AMO and NAO with the East Asian stalagmite δ18O record show significant differences in the post-industrial relative to the pre-industrial period. This implies that the East Asian stalagmite δ18O record may primarily reflect the PDO signal.

关 键 词：STALAGMITE oxygen isotope large-scale circulation lead-lag correlation East Asian climate 

分 类 号：P732.6[天文地球—海洋科学]