气候变化领域集成服务门户(CCPortal): Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene

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DOI	10.1073/pnas.2214558120
	Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
	Jin, Chun-Sheng; Xu, Deke; Li, Mingsong; Hu, Pengxiang; Jiang, Zhaoxia; Liu, Jianxing; Miao, Yunfa; Wu, Fuli; Liang, Wentian; Zhang, Qiang; Su, Bai; Liu, Qingsong; Zhang, Ran; Sun, Jimin
发表日期	2023
ISSN	0027-8424
EISSN	1091-6490
卷号	120 期号:15
英文摘要	The modern pattern of the Asian monsoon is thought to have formed around the Oligocene/Miocene transition and is generally attributed to Himalaya-Tibetan Plateau (H-TP) uplift. However, the timing of the ancient Asian monsoon over the TP and its response to astronomical forcing and TP uplift remains poorly known because of the paucity of well-dated high-resolution geological records from the TP interior. Here, we present a precession-scale cyclostratigraphic sedimentary section of 27.32 to 23.24 million years ago (Ma) during the late Oligocene epoch from the Nima Basin to show that the South Asian monsoon (SAM) had already advanced to the central TP (32 degrees N) at least by 27.3 Ma, which is indicated by cyclic arid-humid fluctuations based on environmental magnetism proxies. A shift of lithology and astronomically orbital periods and amplified amplitude of proxy measurements as well as a hydroclimate transition around 25.8 Ma suggest that the SAM intensified at similar to 25.8 Ma and that the TP reached a paleoelevation threshold for enhancing the coupling between the uplifted plateau and the SAM. Orbital short eccentricity-paced precipitation variability is argued to be mainly driven by orbital eccentricity-modulated low-latitude summer insolation rather than glacial-interglacial Antarctic ice sheet fluctuations. The monsoon data from the TP interior provide key evidence to link the greatly enhanced tropical SAM at 25.8 Ma with TP uplift rather than global climate change and suggest that SAM's northward expansion to the boreal subtropics was dominated by a combination of tectonic and astronomical forcing at multiple timescales in the late Oligocene epoch.
关键词	South Asian monsoon cyclostratigraphy late Oligocene Tibetan Plateau Nima Basin
英文关键词	MARINE-SEDIMENTS; EURASIAN CLIMATE; GLOBAL MONSOON; PLATEAU; EVOLUTION; UPLIFT; DYNAMICS; RECORD; MIDDLE; CONVERGENCE
WOS研究方向	Multidisciplinary Sciences
WOS记录号	WOS:001038916900004
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283456
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; Peking University; Australian National University; Ocean University of China; Ministry of Natural Resources of the People's Republic of China; Chinese Academy of Sciences; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Northwest University Xi'an; Southern University of Science & Technology; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Jin, Chun-Sheng,Xu, Deke,Li, Mingsong,et al. Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene[J]. 中国科学院青藏高原研究所,2023,120(15).
APA	Jin, Chun-Sheng.,Xu, Deke.,Li, Mingsong.,Hu, Pengxiang.,Jiang, Zhaoxia.,...&Sun, Jimin.(2023).Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,120(15).
MLA	Jin, Chun-Sheng,et al."Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 120.15(2023).