干旱区生态环境知识资源中心(Arid): Millennial-scale vegetation and climatic changes from an Early to Mid-Holocene lacustrine archive in Central Ganga Plains using multiple biotic proxies

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DOI	10.1016/j.quascirev.2020.106474
	Millennial-scale vegetation and climatic changes from an Early to Mid-Holocene lacustrine archive in Central Ganga Plains using multiple biotic proxies
	Misra, Pavani; Farooqui, Anjum; Sinha, Rajiv; Khanolkar, Sonal; Tandon, Sampat K.
通讯作者	Sinha, R
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2020
卷号	243
英文摘要	The Indo-Gangetic floodplains have many abandoned meander cut-offs and oxbow lakes that can serve as potential archives for high-resolution paleoclimatic reconstruction. Previously, a few of these lakes have been investigated for understanding the regional Holocene climatic history, but these studies are generally limited by a lack of high chrono-stratigraphic resolution. To develop an understanding of the role of local and/or regional climate forcings, an oxbow lake (Baraila Tal) in the Central Ganga Plains has been studied using multiple biotic proxies such as pollen, phytoliths, diatoms, and sponge spicules. Millennial-scale climatic fluctuations and vegetation history for the Early to Mid-Holocene period have been reconstructed using 17 AMS radiocarbon dates from two trenches, 3-4 m deep. Five major biotic zones have been delineated between 13.2 and 4.8 kyr BP. Zone I (similar to 13-12 kyr BP) shows small patches of dry tropical woody flora along with tall C4 grass indicating a moderately dry climate. The presence of low-temperature herbs indicates an active NE monsoon but the paucity of arboreals indicates a weakened Indian Summer Monsoon (ISM). The high percentages of Phacotus lenticularis cysts in Zone II (12-9 kyr BP) indicate the presence of stagnant, lime-rich inland waters under relatively colder climatic conditions. The appearance of evergreen forest groves around 11.5 kyr BP indicates an increase in humidity, and lake deepening was inferred between 10.9 and 10.3 kyr BP. Sediment accumulation rate shows a sudden drop at similar to 10.3 kyr BP indicating a complete cut-off of the oxbow lake from the fluvial channel. Zone III (9-8 kyr BP) records millennial-scale drying with a complete absence of aquatic pollen between 8.9 and 7.7 kyr BP. The expansion of short C4 grass in Zone IV (8-7 kyr BP) further indicates drier conditions. Zone V (7-similar to 5 kyr BP) shows very high percentages of sponge spicules that flourish in clear waters, and represents a strengthened ISM and a subsequent lake expansion. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Holocene climate Lake sediments Ganga Plains Biotic proxies Palynology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000564800900001
WOS关键词	PHACOTUS-LENTICULARIS CHLOROPHYTA ; HOLOCENE ENVIRONMENTAL-CHANGES ; LATE PLEISTOCENE-HOLOCENE ; INDIAN-SUMMER MONSOON ; QUATERNARY VEGETATION ; LAKE-SEDIMENTS ; KARELA JHEEL ; THAR DESERT ; ARABIAN SEA ; RECORD
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325948
作者单位	[Misra, Pavani; Sinha, Rajiv; Khanolkar, Sonal] Indian Inst Technol Kanpur, Dept Earth Sci, Kanpur 208016, Uttar Pradesh, India; [Farooqui, Anjum] Birbal Sahni Inst Palaeosci, 53 Univ Rd, Lucknow 226001, Uttar Pradesh, India; [Tandon, Sampat K.] Indian Inst Sci Educ & Res Bhopal, Dept Earth & Environm Sci, Bhopal 462066, India
推荐引用方式 GB/T 7714	Misra, Pavani,Farooqui, Anjum,Sinha, Rajiv,et al. Millennial-scale vegetation and climatic changes from an Early to Mid-Holocene lacustrine archive in Central Ganga Plains using multiple biotic proxies[J],2020,243.
APA	Misra, Pavani,Farooqui, Anjum,Sinha, Rajiv,Khanolkar, Sonal,&Tandon, Sampat K..(2020).Millennial-scale vegetation and climatic changes from an Early to Mid-Holocene lacustrine archive in Central Ganga Plains using multiple biotic proxies.QUATERNARY SCIENCE REVIEWS,243.
MLA	Misra, Pavani,et al."Millennial-scale vegetation and climatic changes from an Early to Mid-Holocene lacustrine archive in Central Ganga Plains using multiple biotic proxies".QUATERNARY SCIENCE REVIEWS 243(2020).