古尔班通古特沙漠及周边区域全新世环境演变研究进展  

Research progress of Holocene environmental evolution in theGurbantunggut Desert and its surrounding areas

作　　者：徐宇杰 刘冰 孙爱军 汪克奇 李冬雪 赵晖 XU Yujie;LIU Bing;SUN Aijun;WANG Keqi;LI Dongxue;ZHAO Hui(Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Western China’s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,Gansu,China)

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]兰州大学资源环境学院/西部环境教育部重点实验室,甘肃兰州730000

出　　处：《干旱区地理》2023年第4期550-562,共13页Arid Land Geography

基　　金：国家重点研发计划项目(2018YFA0606400);国家自然科学基金(41977393)资助。

摘　　要：古尔班通古特沙漠作为中国最大的固定、半固定沙漠,是中国境内受西风环流影响最为明显的沙漠之一,其全新世环境演变过程及其对全球气候变化的响应和反馈,对理解该区现代地表过程与未来环境演变趋势具有重要的科学意义。古尔班通古特沙漠及周边区域全新世环境演变研究的结果明显不同,存在中晚全新世和中全新世降水/湿度变化最优期的分歧,成因机制存在季风深入内陆和西风总体控制的争议。以目前区域已发表的多载体记录为基础,通过降维和集成分析重建了该区全新世气候/湿度变化背景,梳理区域风沙沉积地层年代学时空分布,集成了该区全新世风沙活动历史,进而探讨区域风沙活动与湿度变化的耦合关系。结果表明该区早中全新世(12~6 ka)气候干旱,风沙活动强烈;中晚全新世以来湿度逐渐增加、风沙活动逐渐减弱。通过区域及半球尺度的对比分析,发现该区环境演变过程主要受西风环流的控制。The Gurbantunggut Desert(GGD),the largest fixed and semi-fixed desert in northwestern China,is the region most obviously affected by westerly circulation in China.Holocene environmental evolution and its response to global climate change have important scientific significance in understanding the modern surface process and future environmental evolution trends in the GGD.The previously studies on the Holocene environmental evolution of the GGD and its surrounding areas are controversial:some studies have concluded that optimal periods of precipitation/humidity happened in the Middle-Late Holocene,while others concluded that the optimal periods occurred in the Middle Holocene and that the genetic mechanism is in dispute between the monsoon intruding inland and the overall control by the westerly.This study reconstructs the Holocene climate/humidity variation using dimensionality reduction and integrated analysis based on the multiarchive records published in the study area,and synthesizes the Holocene aeolian sand activity history by sorting out the chronological distribution of the regional aeolian sedimentary stratigraphy.The coupling relationship between regional aeolian activity and humidity change is also examined.The results show that the early Middle Holocene(12-6 ka)in this area was arid,with considerable aeolian activity;the humidity gradually increased and the aeolian activity gradually weakened from the Middle to the Late Holocene.According to the comparative analysis on the regional and hemispheric scales,it is concluded that the environmental evolution process in the GGD is mainly controlled by the westerly circulation.

关 键 词：全新世 湿度变化 风沙活动 成因机制 古尔班通古特沙漠 

分 类 号：P534.632[天文地球—第四纪地质学] P931.3[天文地球—古生物学与地层学]