青海湖地区近1ka来气候变化机制  

Mechanism of climate changes in the Qinghai Lake area during the last 1000 years

作　　者：朱正杰[1,2,3] 李航[2] 双燕[2] 任世聪[2] 汪卉[2] 陈敬安[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]外生成矿与矿山环境重庆市重点实验室,重庆地质矿产研究院,重庆400042 [3]煤炭资源与安全开采国家重点实验室重庆研究中心,重庆400042

出　　处：《成都理工大学学报（自然科学版）》2010年第6期632-637,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(40773066);国家重点基础研究发展计划项目(2006CB403201)

摘　　要：对区域性温度和降雨量变化特别是其驱动机制的理解有助于深入了解过去全球气候变化和预测未来。通过对青海湖沉积物中单一种属介形虫壳体胖真星介(Eucypris inflate)氧同位素组成结合已有的年代学数据,探讨了青海湖地区近1ka来的气候变化机制。研究表明青海湖沉积物介形虫壳体δ18O主要反映了湖区干湿变化,而降雨量和干湿指数的负相关变化说明介形虫壳体δ18O可以用来指示湖区降雨量的变化,介形虫壳体δ18O值与太阳活动指标(大气14C和冰芯10Be含量)一致性变化表明青海湖地区降雨量的变化主要是受太阳活动控制的。The knowledge of the regional precipitation and temperature variations and its mechanism is helpful to understand the past global climate changes and predict the future.On the basis of analysis of δ18O values of single ostracod shells Eucypris inflate retrieved from the sediments of Qinghai Lake in China,together with the established dating data,this paper discusses the mechanism of climate changes in the Qinghai Lake area during the past 1000 years.The result suggests that δ18O values of ostracod shells reflect the variations of dry/flood,and the negative correlation between precipitation and the dry/flood index indicates that δ18O values of ostracod shells can be used to deduce precipitation variations.The good agreement between δ18O values of ostracod shells and solar activity index including 14C and 10Be concentrations demonstrates that precipitation variations in the Qinghai Lake area during the past 1000 years are primarily controlled by solar activities.

关 键 词：青海湖 胖真星介 氧同位素组成 太阳活动 降雨量 

分 类 号：P534.63[天文地球—第四纪地质学]