干旱区生态环境知识资源中心(Arid): Evolutionary inferences from the sedimentary deposits of Lake LH73, Larsemann Hills, East Antarctica

Arid

DOI	10.1016/j.catena.2021.105341
	Evolutionary inferences from the sedimentary deposits of Lake LH73, Larsemann Hills, East Antarctica
	Mahesh, Badanal Siddaiah; Warrier, Anish Kumar; Nair, Abhilash; Fernandes, Revellino; Mohan, Rahul
通讯作者	Mahesh, BS (corresponding author), Natl Ctr Polar & Ocean Res NCPOR, Antarctic Sci, Minist Earth Sci, Vasco Da Gama 403804, Goa, India.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	203
英文摘要	Lakes from the coastal oasis of Larsemann Hills respond to changes in regional climate. They are mainly influenced by the ice-sheet dynamics and regional eustatic variation based on their proximity to either of them or both. The sedimentary sequences of the ice-free regions of Antarctica offer unique climate records (lake sediment deposits). Here, we present the evolution of a lake reconstructed from its sedimentary sequence. A 60 cm long radiocarbon-dated sediment core spanning the last 11.8 kyr from Lake LH73 located in Broknes Peninsula of Larsemann Hills is studied for grain size fractions, magnetic susceptibility, and diatom abundance. Based on the diatom and grain fraction data, it is inferred that the lake persisted as a proglacial lake during the early-Holocene (11.8 to 7.2 ky BP) dammed by ice-sheet towards the south. The lake level was at least 3 m higher than the present level (4 m) as inferred from the diatom transfer function owing to the presence of ice dam. The retreat of the ice-sheet and the collapse of the ice dam between 7.2 and 7 ky BP resulted in the lake transitioning to an isolated lake with the lake level attaining current level (4 m). As a consequence, the catchment area increased and the lake received meltwater from the snowbanks hence largely modulating the sedimentary process. The absence of glacial clay from 5 ky BP suggests that the lake was cut-off from the glacial input. The appearance of diatom at similar to 8.6 ky BP indicates the establishment of optimal condition for productivity in the lake ecosystem. Stauroforma inermis and Plannothidium quadripunctatum (Psammothidium abundans) dominates between 7 ky BP till present (11.8 to 7 ky BP), responding to lake level variation. Ice-sheet retrieval and ablation led to transition of proglacial-to-isolated lake leading to shallowing of the lake as reflected in diatom assemblage changes.
英文关键词	Grain size Diatoms Magnetic susceptibility Ecological modeling Lake level Holocene Larsemann Hills East Antarctica
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000654354000040
WOS关键词	GRAIN-SIZE DISTRIBUTION ; FRESH-WATER ; RAUER-ISLANDS ; SALINE LAKES ; PRYDZ BAY ; LACUSTRINE SEDIMENTS ; SCHIRMACHER OASIS ; CLIMATE-CHANGE ; DIATOM FLORA ; HOLOCENE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349806
作者单位	[Mahesh, Badanal Siddaiah; Nair, Abhilash; Mohan, Rahul] Natl Ctr Polar & Ocean Res NCPOR, Antarctic Sci, Minist Earth Sci, Vasco Da Gama 403804, Goa, India; [Warrier, Anish Kumar] Manipal Acad Higher Educ, Ctr Climate Studies, Dept Civil Engn, Manipal Inst Technol, Manipal 576104, Karnataka, India; [Fernandes, Revellino] Goa Univ, Dept Earth Sci, Taleigao Plateau 403206, Goa, India
推荐引用方式 GB/T 7714	Mahesh, Badanal Siddaiah,Warrier, Anish Kumar,Nair, Abhilash,et al. Evolutionary inferences from the sedimentary deposits of Lake LH73, Larsemann Hills, East Antarctica[J],2021,203.
APA	Mahesh, Badanal Siddaiah,Warrier, Anish Kumar,Nair, Abhilash,Fernandes, Revellino,&Mohan, Rahul.(2021).Evolutionary inferences from the sedimentary deposits of Lake LH73, Larsemann Hills, East Antarctica.CATENA,203.
MLA	Mahesh, Badanal Siddaiah,et al."Evolutionary inferences from the sedimentary deposits of Lake LH73, Larsemann Hills, East Antarctica".CATENA 203(2021).