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.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
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)
关键词
青海湖
胖真星介
氧同位素组成
太阳活动
降雨量
Qinghai Lake
Eucypris inflate
oxygen isotope composition
solar activity
precipitation
