气候变化领域集成服务门户(CCPortal): 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 P.; Farooqui A.; Sinha R.; Khanolkar S.; Tandon S.K.
发表日期	2020
ISSN	0277-3791
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 (∼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 ∼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 –∼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. © 2020 Elsevier Ltd
英文关键词	Biotic proxies; Ganga Plains; Holocene climate; Lake sediments; Palynology
语种	英语
scopus关键词	Atmospheric thermodynamics; Expansion; Lime; Rivers; Stratigraphy; Temperature; Vegetation; Climatic conditions; Climatic fluctuations; Evergreen forests; Indian summer monsoon; Paleoclimatic reconstruction; Radiocarbon dates; Sediment accumulation; Vegetation history; Lakes; C4 plant; chronostratigraphy; climate forcing; climate variation; diatom; floodplain; grass; Holocene; lacustrine deposit; meander; monsoon; oxbow lake; paleoclimate; phytolith; pollen; proxy climate record; reconstruction; sponge; vegetation dynamics; vegetation history; Central Department; Gangetic Plain; Bacillariophyta; Phacotus lenticularis
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151363
作者单位	Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow, 226001, India; Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, Bhopal, 462066, India
推荐引用方式 GB/T 7714	Misra P.,Farooqui A.,Sinha R.,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 P.,Farooqui A.,Sinha R.,Khanolkar S.,&Tandon S.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 P.,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).