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DOI	10.1016/j.palaeo.2021.110505
	Glacial-Holocene climate-driven shifts in lacustrine and terrestrial environments: Rock magnetic and geochemical evidence from East Antarctic Mochou Lake
	Noronha-D'Mello, Cheryl A.; Nair, A.; Mahesh, B. S.; Warrier, A. K.; Mohan, Rahul; Kurian, Siby
通讯作者	Noronha-D'Mello, CA (corresponding author), Govt India, Natl Ctr Polar & Ocean Res, Minist Earth Sci MoES, Vasco Da Gama 403804, Goa, India.
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2021
卷号	576
英文摘要	Geomorphic reconstructions of the East Antarctic Ice Sheet history across Antarctica suggest diachronous and varying retreat patterns with changing climate. However, little is known of how terrestrial environments responded to these climate changes because the continental ice sheet covered most Antarctic coastal oases during the Last Glacial Maximum (LGM), eliminating terrestrial records. In this study, the environmental history spanning the last 25,400 years was reconstructed using geochronology, lithology, rock magnetism and geochemistry to understand the effect of glacial-deglacial climate variations on surface processes and Mochou Lake ecology. During the last glacial period (25.4 to 18.8 cal. kyr BP), intensified winds and the freeze-thaw action of ice actively weathered the high elevation western catchment that was a dominant sediment source to the lake. The glacial environmental conditions induced a persistent perennial lake ice-cover resulting in anoxia, low sedimentation, primary production and weak brackish conditions. Progressively, as deglacial conditions augmented around 18.8 cal. kyr BP, increased catchment meltwater flow enhanced sediment transport and also transformed the lake into a freshwater basin, although perennial ice-cover still prevailed. Further, the biotic development of the lake began later in the Mid-Holocene as compared to other lakes in the region, wherein the seasonal lake ice cycle and/or ice moat developed. Weak chemical weathering and pedogenesis also commenced in the catchment in response to the warming climate trend. This delayed response to the Holocene warming was possibly due to the local cooling effect of the Dalk Glacier's discharge that also led to sea-ice persistence in the Prydz Bay. This study also provides further evidence that parts of the Larsemann Hills remained free of erosive grounded ice during the LGM and subsequent deglaciation. The Mirror Peninsula, specifically, escaped ice overriding despite being enclosed by the Dalk Glacier, Lake Nella ice lobe and Amery Ice Shelf.
英文关键词	Deglaciation Lake sedimentation Sediment provenance Weathering Paleoecology Paleolimnology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000668458200010
WOS关键词	FRESH-WATER LAKE ; LARSEMANN HILLS ; SCHIRMACHER OASIS ; PRYDZ BAY ; SEDIMENT CORE ; GRAIN-SIZE ; ICE-SHEET ; PALEOLIMNOLOGICAL CHANGES ; ELEMENT GEOCHEMISTRY ; LIVINGSTON ISLAND
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364281
作者单位	[Noronha-D'Mello, Cheryl A.; Nair, A.; Mahesh, B. S.; Mohan, Rahul] Govt India, Natl Ctr Polar & Ocean Res, Minist Earth Sci MoES, Vasco Da Gama 403804, Goa, India; [Warrier, A. K.] Manipal Acad Higher Educ, Ctr Climate Studies, Manipal Inst Technol, Dept Civil Engn, Manipal 576104, Karnataka, India; [Kurian, Siby] CSIR, Natl Inst Oceanog, Panaji 403004, Goa, India
推荐引用方式 GB/T 7714	Noronha-D'Mello, Cheryl A.,Nair, A.,Mahesh, B. S.,et al. Glacial-Holocene climate-driven shifts in lacustrine and terrestrial environments: Rock magnetic and geochemical evidence from East Antarctic Mochou Lake[J],2021,576.
APA	Noronha-D'Mello, Cheryl A.,Nair, A.,Mahesh, B. S.,Warrier, A. K.,Mohan, Rahul,&Kurian, Siby.(2021).Glacial-Holocene climate-driven shifts in lacustrine and terrestrial environments: Rock magnetic and geochemical evidence from East Antarctic Mochou Lake.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,576.
MLA	Noronha-D'Mello, Cheryl A.,et al."Glacial-Holocene climate-driven shifts in lacustrine and terrestrial environments: Rock magnetic and geochemical evidence from East Antarctic Mochou Lake".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 576(2021).