globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2021.07.023
论文题名:
Paleogeography control of Indian monsoon intensification and expansion at 41 Ma
作者: Fang X.; Yan M.; Zhang W.; Nie J.; Han W.; Wu F.; Song C.; Zhang T.; Zan J.; Yang Y.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Asia paleogeography ; Driven factors and forcings ; Eocene paleoenvironment ; Indian tropical monsoon ; Subtropical monsoon onset
英文关键词: Expansion ; Tropics ; Asia paleogeography ; Asian monsoon ; Driven factor and forcing ; East Asia ; Eocene paleoenvironment ; Indian monsoon ; Indian tropical monsoon ; Paleogeography ; Subtropical monsoon onset ; Tibetan Plateau ; Atmospheric thermodynamics
英文摘要: As a crucial part of the Asian monsoon stretching from tropical India to temperate East Asia, the Indian monsoon (IM) contributes predominant precipitation over Asian continent. However, our understanding of IM's onset, development and the underlying driving mechanisms is limited. Increasing evidence indicates that the IM began in the Eocene or even the Paleocene and was unexceptionally linked to the early rise of the Tibetan Plateau (TP). These were challenged by the heterogeneous and diachronous uplift of the TP and all the reported records were confined to tropical zone under tropical monsoon driven by the Intertropical Convergence Zone (ITCZ) that is irrelevant to the TP. Therefore, reliable paleoclimatic records from the extra-tropical IM region is crucial to reveal how the tropical IM expanded to subtropical and temperate zones and what driving factors might be related to it. Here we present robust Eocene paleoenvironmental records from central Yunnan (~26°N) in subtropical East Asia. The multiproxy results of two sites demonstrate a consistent sudden switch from a dry environment in the early Eocene to a seasonally wet one at 41 Ma, suggesting a jump of the tropical IM to the southern subtropical zone at 41 Ma. The full collision of India with Asia, and the resulting changes in paleogeography at 41 Ma (closure of the Neotethys sea, retreat of the Paratethys seas, fast northward movement of the southern margin of the TP and rise of the central TP), aided by synchronous Antarctic cooling, might have worked together to drive the IM enhancement and northward expansion. © 2021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170241
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research (TPESRE), Chinese Academy of Sciences, Beijing, 100101, China; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Key Laboratory of Western China's Environments of Ministry of Education, Lanzhou University, Lanzhou, 730000, China; Shandong Provincial Key Laboratory of Water and Soil Conservation & Environmental Protection, School of Resource and Environmental Sciences, Linyi University, Linyi, 276000, China; School of Earth Sciences & Key Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, Lanzhou, 730000, China

Recommended Citation:
Fang X.,Yan M.,Zhang W.,et al. Paleogeography control of Indian monsoon intensification and expansion at 41 Ma[J]. Science Bulletin,2021-01-01
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