| Leaf physiognomy records the Miocene intensification of the South Asia Monsoon | |
| Bhatia, Harshita; Srivastava, Gaurav; Spicer, R. A.; Farnsworth, Alex2; Spicer, T. E. V.; Mehrotra, R. C.; Paudayal, Khum N.; Valdes, Paul2 | |
| 2021 | |
| Source Publication | GLOBAL AND PLANETARY CHANGE
 |
| ISSN | 0921-8181 |
| Volume | 196Pages:- |
| Abstract | 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 (similar to 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 (similar to 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. |
| Keyword | MAGNETIC-POLARITY STRATIGRAPHY UPPER SIWALIK SUBGROUP SURAI-KHOLA-SIWALIKS ENVIRONMENTAL-CHANGE TIBETAN PLATEAU CLIMATE-CHANGE HIMALAYA NEPAL EOCENE EVOLUTION |
| Subject Area | Geography, Physical ; Geosciences, Multidisciplinary |
| DOI | 10.1016/j.gloplacha.2020.103365 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000607221200002 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/11930 |
| Collection | 其他 |
| Affiliation | 1.[Bhatia, Harshita; Srivastava, Gaurav; Mehrotra, R. C.] Birbal Sahni Inst Palaeosci, 53 Univ Rd, Lucknow 226007, Uttar Pradesh, India 2.Spicer, R. A.] Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, Bucks, England 3.Univ Bristol, Sch Geog Sci, Univ Rd, Bristol BS8 1SS, Avon, England 4.Spicer, R. A.; Spicer, T. E. V.] Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Mengla 666303, Peoples R China 5.Paudayal, Khum N.] Tribhuvan Univ, Cent Dept Geol, Kathmandu, Nepal |
| Recommended Citation GB/T 7714 | Bhatia, Harshita,Srivastava, Gaurav,Spicer, R. A.,et al. Leaf physiognomy records the Miocene intensification of the South Asia Monsoon[J]. GLOBAL AND PLANETARY CHANGE,2021,196:-. |
| APA | Bhatia, Harshita.,Srivastava, Gaurav.,Spicer, R. A..,Farnsworth, Alex.,Spicer, T. E. V..,...&Valdes, Paul.(2021).Leaf physiognomy records the Miocene intensification of the South Asia Monsoon.GLOBAL AND PLANETARY CHANGE,196,-. |
| MLA | Bhatia, Harshita,et al."Leaf physiognomy records the Miocene intensification of the South Asia Monsoon".GLOBAL AND PLANETARY CHANGE 196(2021):-. |
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