临汾盆地黄土沉积记录的末次冰消期以来东亚夏季风变化  

Variations of the East Asian Summer Monsoon since the Last Deglaciation recorded by loess deposits in the Linfen Basin

作　　者：陈杰 尹佳男 田庆春 Chen Jie;Yin Jianan;Tian Qingchun(School of Geography,South China Normal University,Guangzhou 510631,Guangdong,China;School of Geographical Sciences,Shanxi Normal University,Taiyuan 030000,Shanxi,China;Institute of Early Chinese Civilization,Shanxi Normal University,Taiyuan 030000,Shanxi,China)

机构地区：[1]华南师范大学地理科学学院,广东广州510631 [2]山西师范大学地理科学学院,山西太原030000 [3]山西师范大学中华早期文明研究院,山西太原030000

出　　处：《地理科学》2025年第2期415-424,共10页Scientia Geographica Sinica

基　　金：国家自然科学基金青年项目(42201168);教育部人文社会科学研究项目(23YJAZH135);广东省基础与应用基础研究基金项目(2021A1515110246);广州市科技计划项目(202201010425);山西省文物局科研课题项目(22-8-14-1400-119)资助。

摘　　要：选择临汾盆地陶寺遗址附近中梁黄土剖面为研究对象,通过分析磁化率、元素含量等的变化,结合AMS14C测年,重建该区域末次冰消期以来东亚夏季风(EASM)演化过程。认识如下:(1)中梁剖面磁化率和地球化学元素变化记录了自16 ka B.P.以来一系列短尺度气候波动事件,如新仙女木事件(YD)和10.2 ka B.P.、9.2 kaB.P.、4.2 ka B.P.降温事件,但8.2 ka B.P.降温事件在该区的记录并不明显,表明末次冰消期以来该地区的气候变化具有全球特征,但同时也受区域气候变化的影响;(2)东亚夏季风EASM在(16.6—6.0) ka B.P.持续增强,(7.6—6.0) ka B.P.达到最盛,6 ka B.P.以后呈现波动减弱的趋势;(3)东亚夏季风EASM在早全新世对太阳辐射有一定的滞后性,全新世中期与太阳辐射变化基本一致,表明东亚夏季风总体上受太阳辐射驱动,同时也受到北高纬冰盖的调控;冰盖以及冰川融水注入大西洋引起的北大西洋径向环流(AMOC)的减弱一定程度上抑制了东亚夏季风的强度,导致出现如新仙女木事件和9.2 ka B.P.东亚夏季风明显减弱事件。As an important part of global climate systems,the East Asian Summer Monsoon(EASM)and its variations are the focus of academic research.The associated precipitation is closely related to socio-economic development of East Asia,affecting on the production and life of billions of populations.It is thus important to investigate the variability of the EASM on various time-scales and to explore its underlying forcing mechanisms.However,monsoon precipitation over China exhibits large spatial differences,based on reconstructions from various types of paleoclimatic archives and proxies.An enhanced EASM is characterized by increased rainfall in northern China and by reduced rainfall in southern China,with this relationship occurring on different time scales during the Holocene.Moreover,the stability of the EASM during Holocene and the timing of the Holocene climatic optimum throughout its dominated regions remains controversial.These pending questions fundamentally limit our further understanding of the evolution of human-environment interactions and the prediction of long-term trends of regional and global climate in the context of global warming.The Linfen Basin is situated on the southeastern margin of the Chinese Loess Plateau,belonging to a transitional zone between semi-arid and semi-humid region and being sensitive to EASM variation.In this study,we chose Zhong Liang(ZL)loess section in the Linfen Basin as research object to reconstruct the variation of the EASM since the Last Deglaciation,by using paleomagnetic dating providing age control and utilizing magnetic susceptibility and elemental composition proxies reconstructing the variability of the EASM since the Last Deglaciation.The results show that a series of short-term climate fluctuation events have been recorded by magnetic susceptibility and elemental composition of ZL section since the Last Deglaciation,such as the Younger Dryas(YD),10.2 ka B.P.,9.2 ka B.P.and 4.2 ka B.P.cooling event.However,the 8.2 ka B.P.cooling event was not evident in this region.The

关 键 词：临汾盆地 黄土沉积 东亚夏季风 全新世 末次冰消期 

分 类 号：P532[天文地球—古生物学与地层学]