查格勒布鲁剖面记录的OIS3a巴丹吉林沙漠季风气候变化  

Monsoonal climate changes from the Chagelebulu section of the Badain Jaran Desert in China during the OIS3a

作　　者：王丰年[1] 李保生[2,3] 蒋树萍 牛东风[2] 温小浩[2] 李志文[5] 郭亿华[6] 司月君[7] 杨志英[1] 刘恩波[1] 

机构地区：[1]惠州学院旅游系,惠州516007 [2]华南师范大学地理科学学院,广州510631 [3]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [4]广州一中,广州510630 [5]东华理工大学地球科学学院,南昌330013 [6]广州地理研究所,广州510070 [7]广西师范学院规划地理科学学院,南宁530001

出　　处：《干旱区资源与环境》2017年第6期97-102,共6页Journal of Arid Land Resources and Environment

基　　金：国家重点基础研究发展计划(973计划)(2013CB955903);惠州学院博士科研启动项目(C513.0203)资助

摘　　要：巴丹吉林沙漠东南缘查格勒布鲁剖面与OIS3a相同时代的CGS3a层段记录了5.5个由沙丘砂或者黄土与湖相构成的沉积旋回。通过对该层段140个样品的Rb,Sr数据分析,结果显示由沙丘砂或黄土至上覆河湖相Rb、Sr含量相应的由低增高,而Rb/Sr的分布则显示出与Rb和Sr含量变化相反的趋势,Rb、Sr含量与平均粒径Mz(φ)的相关系数都达到了0.8以上。研究表明CGS3a层段经历了5次冬季风和6次夏季风交替的气候波动,这些气候事件与GRIP冰芯氧同位素记录的D/O事件能一一对应,Heinrich事件也在其中有很好体现。CGS3a层段所记录的千年尺度气候波动既是对东亚季风环流演变历史的体现,同时也是对全球气候与环境变化的响应。Situated on the southeastern margin of the Badain Jaran Desert in China, The CGS3a segment of the Chagelebulu section contains 5.5 sedimentary cycles which consist of aeolian dune sands or loess alternating with overlying lacustrine facies during the OIS3 a. The analyses of grain - size Mz （φ） and σ, Rb and Sr contents and Rb/Sr ratios for 140 samples showed that the values of Rb and Sr contents and Rb/Sr ratios in lacustrine facies are generally higher than those in dune sands or loess, with correlation coefficients between Rb, Sr and Mz more than 0.8 ; and the graph of Rb and Sr contents and Rb/Sr ratios shows 5.5 oscillations similar to the sedimentary cycles. Thus, the CGS3a segment probably experienced 5.5cold -dry and warm -humid climate cycles in the alternations between the East Asian winter and summer monsoons during the OIS3a. Besides, the warm climate changes in the CGS3a correspond well to the Dansgaard - Oeschger events in the GRIP, and the cold period also corresponds well to the Heinrich Event. The climate changes on millennium - scale in the CGS3a actually record the evolution of the East Asian monsoons, and it is the regional response to the global climate changes during that period.

关 键 词：末次间冰阶 风沙沉积 Rb和Sr 季风气候变化 巴丹吉林沙漠 

分 类 号：P462.4[天文地球—大气科学及气象学]