气候变化领域集成服务门户(CCPortal): Paleogene monsoons across India and South China: Drivers of biotic change

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DOI	10.1016/j.gr.2017.06.006
	Paleogene monsoons across India and South China: Drivers of biotic change
	Spicer, Robert; Yang, Jian; Herman, Alexei; Kodrul, Tatiana; Aleksandrova, Galina; Maslova, Natalia; Spicer, Teresa; Ding, Lin; Xu, Qiang; Shukla, Anumeha; Srivastava, Gaurav; Mehrotra, Rakesh; Liu, Xiao-Yan; Jin, Jian-Hua
通讯作者	Liu, XY ; Jin, JH (通讯作者)
发表日期	2017
ISSN	1342-937X
EISSN	1878-0571
起始页码	350
结束页码	363
卷号	49
英文摘要	Monsoonal climates at low latitudes (<32 degrees N) are an inevitable consequence of seasonal migrations of the Inter-tropical Convergence Zone (ITCZ), but the character of these monsoons depends on continental configuration, oro-graphic expression and the strength of Hadley circulation. To explore the evolution of monsoon systems across southern Asia we compare climate signatures archived in ten Paleogene floras from northern India, Tibet and southern China, occupying low palaeolatitudes at a time of extreme global warmth and elevated CO2. Fossil leaf form reveals that under such 'hothouse' conditions megathermal early Eocene to earliest Miocene forests were exposed to strong monsoonal climates typical of those experienced today arising from annual migrations of the ITCZ, possibly enhanced by a lower equator-to-pole temperature gradient. Throughout the Paleogene an elevated Tibetan highland produced no discernable modification of this ITCZ monsoon, although rainfall seasonality similar to that of the modern South Asia Monsoon (SAM) is observed in northern India as early as the beginning of the Eocene, despite its near-equatorial palaeoposition. In South China rainfall seasonality increased progressively achieving modem monsoon-like wet season/dry season precipitation ratios by the early Oligocene. Despite evidencing weak rainfall seasonality overall, fossil leaves from South China have exhibited monsoon-adapted morphologies, comparable to those seen in today's Indonesia-Australia Monsoon, for at least 45 million years. Together, the Indian and South China fossil leaf assemblages show that the evolution of megathermal ecosystems across southern Asia has been influenced profoundly by monsoonal climates for at least the last 56 million years. The Paleogene ITCZ-driven monsoon system strongly impacted India as it transited the Equator likely eliminating Gondwanan taxa not able to adapt to seasonal precipitation extremes. Furthermore, powerful seasonally-reversing winds, and associated surface ocean currents, are likely to have facilitated two-way biotic transfer between India and Eurasia long before closure of the Tethys Ocean. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	PALEOEQUATORIAL RAIN-FOREST ASIA CONTINENTAL COLLISION VASTAN LIGNITE MINE SHALE LOWER EOCENE OLIGOCENE SEDIMENTS TIBET IMPLICATIONS NORTHWEST INDIA BASIN EVOLUTION LEGUME FRUITS FISH OTOLITHS
英文关键词	Plant evolution; ITCZ; Eocene; Oligocene; Climate; Tibet
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000414383200018
来源期刊	GONDWANA RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259088
推荐引用方式 GB/T 7714	Spicer, Robert,Yang, Jian,Herman, Alexei,et al. Paleogene monsoons across India and South China: Drivers of biotic change[J]. 中国科学院青藏高原研究所,2017,49.
APA	Spicer, Robert.,Yang, Jian.,Herman, Alexei.,Kodrul, Tatiana.,Aleksandrova, Galina.,...&Jin, Jian-Hua.(2017).Paleogene monsoons across India and South China: Drivers of biotic change.GONDWANA RESEARCH,49.
MLA	Spicer, Robert,et al."Paleogene monsoons across India and South China: Drivers of biotic change".GONDWANA RESEARCH 49(2017).