Late Miocene weakening of the South Asian Monsoon: Insights from the Siwalik of Nepal

doi:10.1016/j.palaeo.2025.112789

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	Late Miocene weakening of the South Asian Monsoon: Insights from the Siwalik of Nepal
	Adhikari, Purushottam 1; Srivastava, Gaurav 2,3; Farnsworth, Alexander ; Bhatia, Harshita 2,3; Sadanand 2,3; Poudel, Sujata ; Spicer, Robert A.; Rai, Lalit K.; Tao, Su9 ; Valdes, Paul J.; Paudayal, Khum N.
	2025
Source Publication	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
Volume	664 Issue:x Pages:-
Abstract	The South Asian Monsoon (SAM) is the strong summer monsoon within the Asian Monsoon System, driven by the thermal gradient between the warmer Asian landmass and the cooler Indian Ocean. High-resolution marine proxies indicate a decline in SAM strength after approximately 10 million years ago (Ma); however, terrestrial evidence has been limited. We present high-resolution and well-dated leaf assemblages from the Lower and Middle Siwalik of central Nepal, supported by paleoclimate modelling, which suggest a weakening of the SAM between 10.24 and 8.5 Ma. This decline is linked to a reduction in moisture supply, possibly due to a weakening of the Somali Jet. Our study highlights the potential of leaf physiognomy to reconstruct monsoon strength.
Keyword	Leaf flora Neogene Somali Jet Summer monsoon
Subject Area	Physical Geography ; Geology ; Paleontology
DOI	10.1016/j.palaeo.2025.112789
Indexed By	SCI
Language	英语
WOS ID	WOS:001428360300001
Citation statistics
Document Type	期刊论文
Identifier	https://ir.xtbg.ac.cn/handle/353005/14612
Collection	古生态研究组
Affiliation	1.[Adhikari, Purushottam; Poudel, Sujata; Paudayal, Khum N.] Tribhuvan Univ, Cent Dept Geol, Kathmandu, Nepal 2.Tribhuvan Univ, Dept Geol, Birendra Multiple Campus, Chitwan, Nepal 3.Birbal Sahni Inst Palaeosci, 53 Univ Rd, Lucknow 226007, India 4.Acad Sci & Innovat Res AcSIR, Ghaziabad 201002, India 5.Farnsworth, Alexander; Valdes, Paul J.] Univ Bristol, Sch Geog Sci, Bristol BS8 1SS, England 6.Farnsworth, Alexander; Valdes, Paul J.] Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing 100101, Peoples R China 7.Spicer, Robert A.] Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China 8.Spicer, Robert A.] Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, England 9.Rai, Lalit K.] Tribhuvan Univ, Dept Geol, Cent Campus Technol, Dharan, Nepal 10.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China
Recommended Citation GB/T 7714	Adhikari, Purushottam,Srivastava, Gaurav,Farnsworth, Alexander,et al. Late Miocene weakening of the South Asian Monsoon: Insights from the Siwalik of Nepal[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2025,664(x):-.
APA	Adhikari, Purushottam.,Srivastava, Gaurav.,Farnsworth, Alexander.,Bhatia, Harshita.,Sadanand.,...&Paudayal, Khum N..(2025).Late Miocene weakening of the South Asian Monsoon: Insights from the Siwalik of Nepal.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,664(x),-.
MLA	Adhikari, Purushottam,et al."Late Miocene weakening of the South Asian Monsoon: Insights from the Siwalik of Nepal".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 664.x(2025):-.

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