中晚全新世毛乌素沙地东南部气候变化过程  

Climate Change in the Southeastern Mu Us Sandy Land in Middle and Late Holocene

作　　者：杨帆[1,2] 靳鹤龄[1] 李孝泽[1,3] 耿建伟[1,2] 刘冰[1] 

机构地区：[1]中国科学院西北生态环境资源研究院中国科学院沙漠与沙漠化重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]新疆农垦科学院林园研究所,新疆石河子832000

出　　处：《中国沙漠》2017年第3期431-438,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(41272191;41501220;41671204)

摘　　要：位于中国北方半干旱区的毛乌素沙地对气候变化响应敏感,是研究气候变化的理想区域。通过对毛乌素沙地东南部锦界剖面磁化率、有机质含量、Ca CO3含量的分析,重建了7.5 ka BP以来的气候变化过程。结果显示:中晚全新世毛乌素沙地东南部环境与气候变化可分为3个阶段:7.5~4.6 ka BP,夏季风占主导,气候暖湿,与全新世大暖期对应;4.6~3.3 ka BP,气候突变为干冷并波动频繁;3.3~2.5 ka BP气候以干冷为主。另外,存在5次千年尺度的干旱事件:7.0~6.8 ka BP、6.6~5.7 ka BP、4.6~4.1 ka BP、3.7~3.5 ka BP、3.3~2.5 ka BP。研究区气候变化与全球具有较好的一致性。The Mu Us Sandy Land is located at semi-arid region of North China, and it is sensitive to climate changes. The climate change process in the southeastern Mu Us Sandy Land since 7. 5 kyr BP was recon- structed based on data of magnetic susceptibility, organic matter, CaCO3, 14C and OSL dating. The varia- tions of the indices suggest environment and climate changes in the Mu Us Sandy Land can be classified into 3 stages. In 7.5-4. 6 kyr BP, corresponding to the Holocene Climatic Optimu, the summer monsoon was powerful and the climate is warm and wet. In 4. 6-3.3 kyr BP, with frequently alternations of the climate and an abruptly shift at 4. 6 kyr BP, the weakening summer monsoon dominated this period. The climate was cold and arid. In 3.3-2.5 kyr BP, the cold and dry climate was dominated. Additionally, five millenni- al-scale dry events were recorded at 7.0 - 6.8 kyr BP, 6.6 - 5.7 kyr BP, 4.6 - 4. 1 kyr BP, 3.7 - 3.5 kyr BP and 3.3-2.5 kyr BP. In short, the regional climate change is correlated with the global climate change.

关 键 词：毛乌素沙地 磁化率 有机质 CACO3 气候变化 全新世 

分 类 号：P531[天文地球—古生物学与地层学]