中晚全新世毛乌素沙地东南部气候变化过程

发布时间：2019-02-15 10:15

【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。
[Abstract]:Maowusu sandy land located in the semiarid region of northern China is sensitive to climate change and is an ideal region to study climate change. Based on the analysis of magnetic susceptibility, organic matter content and Ca CO3 content in the Jinjie section of southeastern Maowusu Sandy Land, the climatic change process since 7.5 ka BP was reconstructed. The results show that the environment and climate change of southeastern Maowusu sandy land in the Middle-Late Holocene can be divided into three stages: 7.54.6 ka BP, summer monsoon dominates, and the climate is warm and wet, corresponding to the Holocene warm period; The climate of 4. 6C 3. 3 ka BP, changed to dry cold and fluctuated frequently, and 3. 3% 2. 5 ka BP climate was mainly dry and cold. In addition, there were 5 millennial drought events: 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. Climate change in the study area is in good agreement with the global climate change.
【作者单位】：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;中国科学院大学;新疆农垦科学院林园研究所;
【基金】：国家自然科学基金项目(41272191,41501220,41671204)
【分类号】：P532

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