气候变化领域集成服务门户(CCPortal): Leaf physiognomy records the Miocene intensification of the South Asia Monsoon

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DOI	10.1016/j.gloplacha.2020.103365
	Leaf physiognomy records the Miocene intensification of the South Asia Monsoon
	Bhatia H.; Srivastava G.; Spicer R.A.; Farnsworth A.; Spicer T.E.V.; Mehrotra R.C.; Paudayal K.N.; Valdes P.
发表日期	2021
ISSN	9218181
卷号	196
英文摘要	Our understanding regarding the onset and development of the modern South Asia monsoon (SAM) is still incomplete due to its complex nature and differing views about its relationship with major orographic features such as the Himalaya and Tibetan Plateau. Climate data derived from some terrestrial and marine sediments from the Neogene suggests the onset and intensification of the SAM to a near-modern state occurred during the Miocene, while modelling and other terrestrial proxies point to a much earlier origin for the proto-East Asia monsoon (EAM) and proto-SAM. Angiosperm leaves, particularly dicot leaves, provide a good indication of prevailing climatic conditions as a result of key adaptations in their leaf structure. Here we use Climate Leaf Analysis Multivariate Program (CLAMP) in conjunction with general circulation models to decode the Lower (~13–11 Ma) and Middle (9.5–6.8 Ma) Siwalik climate signal inherent in the physiognomy of fossil leaves. The reconstructed climate data indicates that the Middle Siwalik was warmer and wetter than the Lower Siwalik, particularly in the cooler part the year. The leaf physiognomy of Lower and Middle Siwalik assemblages is indistinguishable to that of the modern leaf assemblages, which are influenced by today's SAM climate. This shows that the SAM was already well established as an independent domain during the late middle Miocene (~13–11 Ma) and has remained nearly the same from the perspective of leaf adaptations since then. A quantitative monsoon intensity index indicates an intensified monsoon during the late Miocene (9.5–6.8 Ma), a finding replicated by climate modelling. © 2020 Elsevier B.V.
英文关键词	CLAMP; Dicot leaves; Nepal; Siwalik
语种	英语
scopus关键词	Global and Planetary Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158358
作者单位	Birbal Sahni Institute of Palaeosciences; 53 University Road; Lucknow; 226 007; India; School of Environment; Earth and Ecosystem Sciences; The Open University; Milton Keynes; MK7 6AA; United Kingdom; School of Geographical Sciences; University of Bristol; University Road; Clifton; Bristol; BS8 1SS; United Kingdom; CAS Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Mengla; 666303; China; Central Department of Geology; Tribhuvan University; Kirtipur; Kathmandu; Nepal
推荐引用方式 GB/T 7714	Bhatia H.,Srivastava G.,Spicer R.A.,et al. Leaf physiognomy records the Miocene intensification of the South Asia Monsoon[J],2021,196.
APA	Bhatia H..,Srivastava G..,Spicer R.A..,Farnsworth A..,Spicer T.E.V..,...&Valdes P..(2021).Leaf physiognomy records the Miocene intensification of the South Asia Monsoon.,196.
MLA	Bhatia H.,et al."Leaf physiognomy records the Miocene intensification of the South Asia Monsoon".196(2021).