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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 PublicationGLOBAL AND PLANETARY CHANGE
ISSN0921-8181
Volume196Pages:-
AbstractOur 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.
KeywordMAGNETIC-POLARITY STRATIGRAPHY UPPER SIWALIK SUBGROUP SURAI-KHOLA-SIWALIKS ENVIRONMENTAL-CHANGE TIBETAN PLATEAU CLIMATE-CHANGE HIMALAYA NEPAL EOCENE EVOLUTION
Subject AreaGeography, Physical ; Geosciences, Multidisciplinary
DOI10.1016/j.gloplacha.2020.103365
Indexed BySCI
Language英语
WOS IDWOS:000607221200002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11930
Collection其他
Affiliation1.[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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