A similar to 50 ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas

doi:10.1016/j.quascirev.2015.02.002

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	A similar to 50 ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas
	Ghosh, Ruby ; Bera, Subir 2; Sarkar, Anindya 4; Paruya, Dipak Kumar 2; Yao, Yi-Feng ; Li, Cheng-Sen
刊名	QUATERNARY SCIENCE REVIEWS
	2015
卷号	114 页码:100-115
关键词	Monsoon variation Plant community similar to 50 ka Darjeeling foothill Eastern Himalayas
ISSN号	0277-3791
DOI	10.1016/j.quascirev.2015.02.002
文献子类	Article
英文摘要	Pollen, phytoliths and delta C-13 signatures of soil organic matter from two fluvial sedimentary sequences of the Darjeeling foothill region, eastern Himalayas are used to portray palaeoclimatic oscillations and their impact on regional plant communities over the last similar to 50 ka. Quantitative palaeoclimate estimation using coexistence approach on pollen data and other proxies indicate significant oscillations in precipitation during the late part of MIS 3 (46.4-25.9 ka), early and middle part of MIS 2 (25.9-15.6 ka), and 5.4 to 3.5 ka. Middle to late MIS 3 (ca 46.4-31 ka.) was characterized by a comparatively low monsoonal activity and slightly higher temperature than that during ca 31 ka onwards. Simultaneous expansion of deciduous trees and chloridoid grasses also imply a drier and warmer phase. Between 31 and 22.3 ka (late MIS 3 to mid-MIS 2), higher precipitation and a slightly cooler temperature led to an increase in evergreen elements over deciduous taxa and wet-loving panicoid grasses over dry-loving chloridoid grasses than earlier. After ca 22.3 ka, shrinking of forest cover, expansion of C4 chloridoid grasses, Asteraceae and Cheno-ams in the vegetation with lowering of temperature and precipitation characterized the onset of the LGM which continued till 18.3 ka. End of the LGM is manifested by a restoration in the forest cover and in the temperature and precipitation regime. Later, during 5.4 to 4.3 ka, a strong monsoonal activity supported a dense moist evergreen forest cover that subsequently declined during 4.3 to 3.5 ka. A further increase in deciduous elements and non-arboreals might be a consequence of reduced precipitation and higher temperature during this phase. A comparison between monsoonal rainfall, MAT and palaeoatmospheric CO2 with floral dynamics since last similar to 50 ka indicates that these fluctuations in plant succession were mainly driven by monsoonal variations. (C) 2015 Elsevier Ltd. All rights reserved.
学科主题	Geography, Physical ; Geosciences, Multidisciplinary
电子版国际标准刊号	1873-457X
出版地	OXFORD
WOS关键词	LATE QUATERNARY ; CLIMATE-CHANGE ; ENVIRONMENTAL-CHANGES ; SUMMER-MONSOON ; STABLE-ISOTOPE ; INDIAN MONSOON ; ATMOSPHERIC CO2 ; WESTERN INDIA ; GANGA PLAINS ; LATE MIOCENE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000353090000008
资助机构	China National Key Basic Research Program [2014CB954201] ; National Natural Science Foundation of China [41271222] ; China Scholarship Council [201204910043]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/25567]
专题	系统与进化植物学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing, Peoples R China 2.Birbal Sahni Inst Paleobot, Lucknow 226007, Uttar Pradesh, India 3.Indian Inst Technol, Dept Geol & Geophys, Kharagpur 721302, W Bengal, India 4.Univ Calcutta, Ctr Adv Study, Dept Bot, Palaeobot Palynol Lab, Kolkata 700019, India
推荐引用方式 GB/T 7714	Ghosh, Ruby,Bera, Subir,Sarkar, Anindya,et al. A similar to 50 ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas[J]. QUATERNARY SCIENCE REVIEWS,2015,114:100-115.
APA	Ghosh, Ruby,Bera, Subir,Sarkar, Anindya,Paruya, Dipak Kumar,Yao, Yi-Feng,&Li, Cheng-Sen.(2015).A similar to 50 ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas.QUATERNARY SCIENCE REVIEWS,114,100-115.
MLA	Ghosh, Ruby,et al."A similar to 50 ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas".QUATERNARY SCIENCE REVIEWS 114(2015):100-115.