气候变化领域集成服务门户(CCPortal): Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills; East Antarctica

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DOI	10.1016/j.palaeo.2018.10.029
	Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills; East Antarctica
	Mahesh B.S.; Warrier A.K.; Mohan R.; Tiwari M.
发表日期	2019
ISSN	0031-0182
起始页码	398
结束页码	406
卷号	514
英文摘要	The Antarctic continental margin is marked with ice-free areas which are host to numerous freshwater lakes. These lacustrine systems are rich in sedimentary deposits which archive in them the regional and general climatic variations. These lakes respond to the seasonal variations in climate over glacial-interglacial timescales and can be inferred from the sedimentary proxies. In this study, a 79-cm-long radiocarbon dated sediment core retrieved from a peri-glacial lake is analysed for elementary (Corg%, Norg%), isotopic (δ13COM, δ15NOM) and particle size (sand, silt, clay). The radiocarbon dated sections (0–65 cm) extends up to 43 kyr BP. The time-series of sedimentary organic matter (OM) proxies (Corg ~ 3.5 ± 3%, C/Natomic ratio ~ 11 ± 3 and δ13COM ~ −14 ± 4‰) indicate that the OM in this lake sedimentary record is an admixture of terrestrial and lacustrine biomass. Distinctly higher (lower) values during the Holocene (LGM) suggests presence of terrestrial and aquatic (aquatic) biomass indicating ice-free (ice-cover) and warm (cold) Holocene (glacial) conditions which would result in an increased (decreased) lake-productivity and fluvial (wind) input of sand and clay (silt). Higher sand content (~30, ~24 and ~15 kyr BP), silt content (~24 kyr BP), Corg and Norg (~24 kyr BP) within the Last Glacial Stage (LGS) indicates intermittent warming period in coherence with the Antarctic Isotope Maximum (AIM). The transition in values (Corg, Norg, C/N ratio, δ13COM, sand content) starting at 16.6 kyr BP closely following Antarctic deglaciation to reach Holocene optimum values at 11.3 kyr BP documents the influence of Antarctic climate on regional areas. © 2018 Elsevier B.V.
英文关键词	Antarctic Isotope Maximum; C/N ratio; Carbon and nitrogen isotopes; Glacial-interglacial variations; Organic matter; Particle size variation
语种	英语
scopus关键词	carbon isotope; climate variation; continental margin; deglaciation; glacial-interglacial cycle; Holocene; lacustrine environment; Last Glacial; nitrogen isotope; organic matter; particle size; Quaternary; radiocarbon dating; sediment core; terrestrial environment; Antarctica; East Antarctica; Schirmacher Oasis
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151143
作者单位	National Centre for Antarctic and Ocean Research, Earth System Science Organization (ESSO), Ministry of Earth Sciences, Govt. of India, Headland Sada, Vasco, Goa 403804, India; Centre for Climate Studies/Department of Civil Engineering (MIT), Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
推荐引用方式 GB/T 7714	Mahesh B.S.,Warrier A.K.,Mohan R.,et al. Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills; East Antarctica[J],2019,514.
APA	Mahesh B.S.,Warrier A.K.,Mohan R.,&Tiwari M..(2019).Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills; East Antarctica.Palaeogeography, Palaeoclimatology, Palaeoecology,514.
MLA	Mahesh B.S.,et al."Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills; East Antarctica".Palaeogeography, Palaeoclimatology, Palaeoecology 514(2019).