中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Global Cooling-Driven Summer Monsoon Weakening in South China Across the Eocene-Oligocene Transition

文献类型:期刊论文

AuthorJiao, Wenjun1; Wan, Shiming1,2; Li, Yong-Xiang3; Zhao, Debo1; Liu, Chang4; Jin, Hualong1; Li, Mengjun1; Yu, Zhaojie1; Zhang, Jin1; Pei, Wenqiang1
SourceJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Issued Date2023-11-01
Volume128Issue:11Pages:20
KeywordEast Asian monsoon South China Sea environmental magnetism global cooling Eocene-Oligocene transition International Ocean Discovery Program (IODP) gSite U1501
ISSN2169-9313
DOI10.1029/2023JB027265
Corresponding AuthorWan, Shiming(wanshiming@ms.qdio.ac.cn)
English AbstractRecent research has suggested that East Asia has experienced a prevailing monsoon climate since the Eocene. However, there is little knowledge about the development of the East Asian monsoon system before the Miocene, particularly in southern China, due to a lack of well-dated continuous sediment records. Here, we present new magnetic proxy records from International Ocean Discovery Program Site U1501 in the northern South China Sea. We conducted rock magnetic experiments, made scanning electron microscopy observations and performed diffuse reflectance spectrum analysis on the late Eocene-early Oligocene core sediments. The magnetic signal of the sediments is dominated by detrital magnetite and titanomagnetite formed during the silicate weathering and erosion processes, which were used to infer the evolution of summer monsoon precipitation in southern China. Our results along with geochemical and clay mineral data from Site U1501 strongly indicate that the East Asian summer monsoon generally weakened across the Eocene-Oligocene transition. This change was linked to coeval global cooling rather than tectonic processes. Prior to the Eocene-Oligocene transition, the summer monsoon intensified, likely due to the latest Eocene warming event caused by the enhancement of the Atlantic Meridional Overturning Circulation, which may have preconditioned the Earth system for the greenhouse-to-icehouse transition.
WOS KeywordEAST-ASIAN MONSOON ; TIBETAN PLATEAU ; MAGNETIC-SUSCEPTIBILITY ; ENVIRONMENTAL-CHANGES ; SEA IMPLICATIONS ; CLIMATE ; EVOLUTION ; TEMPERATURE ; RECORDS ; UPLIFT
Funding ProjectWe acknowledge the International Ocean Discovery Program and the scientific party and technicians of IODP Expedition 368 for recovering the samples. We are grateful to Dr. Qingsong Liu, Zhong Yi and Han Peng for their assistance in DRS measurements and dat ; International Ocean Discovery Program[42125602] ; International Ocean Discovery Program[42006050] ; International Ocean Discovery Program[42076052] ; International Ocean Discovery Program[4212500229] ; National Natural Science Foundation of China[XDB40010100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[2022YFF0800503] ; National Key Research and Development Program of China[2017ASTCP-ES01] ; Taishan and Aoshan Talents Program
WOS Research AreaGeochemistry & Geophysics
Language英语
WOS IDWOS:001099683800001
PublisherAMER GEOPHYSICAL UNION