气候变化领域集成服务门户(CCPortal): Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula): Regional and global implications

CCPortal

DOI	10.1016/j.quascirev.2020.106248
	Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula): Regional and global implications
	Palacios D.; Ruiz-Fernández J.; Oliva M.; Andrés N.; Fernández-Fernández J.M.; Schimmelpfennig I.; Leanni L.; González-Díaz B.; ASTER Team
发表日期	2020
ISSN	0277-3791
卷号	234
英文摘要	The timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available information about neoglacial advances in the South Shetland Islands (SSI) as well as in the broader geographical context of the AP region and Antarctic continent. In order to shed light on the contrasting chronologies existing for neoglacial advances in these regions, we focused on a case study where a detailed picture of the Holocene deglaciation was already available. Lake sediments revealed that Byers Peninsula, west of Livingston Island (SSI), was fully deglaciated during the Holocene Thermal Maximum. To complement this approach, we identified glacially polished bedrock surfaces, erratic boulders and a moraine ridge near the present front of the glacier in the SE corner. We applied cosmogenic ray exposure (CRE) dating using in situ 36Cl for basalt rocks and 10Be for granitic rocks in: (i) 8 samples from glacial erratic and ice-rafted boulders, (ii) 2 samples from moraine boulders, (iii) 2 samples from polished bedrock surfaces, and (iv) 1 sample from an erratic boulder deposited on one of these surfaces. The CRE dates indicate that the onset of deglaciation started around 9.9 ± 1.2 ka, with two phases of glacier expansion during the Mid-Late Holocene forming moraines at ∼4.1 ± 0.5 and ∼1.0 ± 0.2 ka, respectively. The main neoglacial advances in the AP and the SSI were mostly synchronous and coincided with cold periods, as shown by other records (e.g. glacio-isostatic marine terraces, marine and lake sediments). In addition, these periods of glacial expansion show a similar timing to those recorded in the Arctic. These results suggest that Neoglaciation was driven by global climate forcing in both polar areas despite temporal variations at regional and local scale. © 2020
英文关键词	Antarctic peninsula; Byers peninsula; Neoglaciation; Surface exposure dating
语种	英语
scopus关键词	Expansion; Glacial geology; Lakes; Timing circuits; Antarctic Peninsula; Byers peninsula; Holocene thermal maximums; Moraine boulders; Neoglaciation; South Shetland Islands; Surface exposure dating; Temporal variation; Landforms; bedrock; climate forcing; deglaciation; glacier dynamics; global climate; Holocene; landform; moraine; Neoglacial; reconstruction; Antarctic Peninsula; Antarctica; Arctic; Byers Peninsula; Livingston Island; South Shetland Islands; West Antarctica
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/151527
作者单位	Department of Geography, Complutense University of Madrid, Spain; Department of Geography, University of Oviedo, Spain; Department of Geography, Universitat de Barcelona, Spain; Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGEAix-en-Provence, France; Consortium: Georges Aumaître, Didier Bourlès, Karim Keddadouche, France
推荐引用方式 GB/T 7714	Palacios D.,Ruiz-Fernández J.,Oliva M.,et al. Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula): Regional and global implications[J],2020,234.
APA	Palacios D..,Ruiz-Fernández J..,Oliva M..,Andrés N..,Fernández-Fernández J.M..,...&ASTER Team.(2020).Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula): Regional and global implications.Quaternary Science Reviews,234.
MLA	Palacios D.,et al."Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula): Regional and global implications".Quaternary Science Reviews 234(2020).