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DOI	10.5194/tc-15-1173-2021
	Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands
	Ruth Thomas E.; Gacitúa G.; Pedro J.B.; Constance Faith King A.; Markle B.; Potocki M.; Elisabeth Moser D.
发表日期	2021
ISSN	19940416
起始页码	1173
结束页码	1186
卷号	15 期号:2
英文摘要	The sub-Antarctic is one of the most data-sparse regions on earth. A number of glaciated Antarctic and sub-Antarctic islands have the potential to provide unique ice core records of past climate, atmospheric circulation, and sea ice. However, very little is known about the glaciology of these remote islands or their vulnerability to warming atmospheric temperature. Here we present melt histories and density profiles from shallow ice (firn) cores (14 to 24 m) drilled on three sub-Antarctic islands and two Antarctic coastal domes. Additionally, complementary ground-penetrating radar (GPR) data were collected to further characterize each site and assess the spatial distribution of the observed melt layers. This study includes the first ever firn cores from Bouvet Island (54-2501900 S, 03-2302700 E) in the South Atlantic, from Peter I Island (68-5100500 S, 90-3003500 W) in the Bellingshausen Sea, and from Young Island (66-3104400 S, 162-3302100 E) in the Ross Sea sector s Balleny island chain. Despite their sub-Antarctic location, surface melt is low at most sites (melt layers account for 10% of total core), with undisturbed ice layers in the upper 40 m, suggesting minimal impact of meltwater percolation. The exception is Young Island, where melt layers account for 47% of the firn core. Surface snow densities range from 0.47 to 0.52 kgm-3, with close-off depths ranging from 21 to 51 m. Based on the measured density, we estimate that the bottom ages of a 100m ice core drilled on Peter 1 Island would reach 1856 CE and 1874 CE at Young Island. © 2021 BMJ Publishing Group. All rights reserved.
英文关键词	air temperature; atmospheric circulation; glaciology; ice core; meltwater; paleoclimate; satellite data; snow cover; spatial distribution; Subantarctic Intermediate Water; subantarctic region; vulnerability; Antarctica; Bellingshausen Sea; Bouvet Island; Peter I Island; Ross Sea; Southern Ocean; West Antarctica
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202418
作者单位	British Antarctic Survey, Ice Dynamics and Paleoclimate, Cambridge, CB3 0ET, United Kingdom; Centro de Investigación Gaia Antártica, Universidad de Magallanes, Punta Arenas, Chile; Australian Antarctic Division, Kingston, 7050, Australia; Australian Antarctic Programme Partnership, Hobart, Tasmania, 7001, Australia; California Institute of Technology, Pasadena, CA 91125, United States; Climate Change Institute, University of Maine, Orono, ME 04469, United States; School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, United States; Institut für Geologie und Paläontologie, University of Münster, Münster, 48149, Germany
推荐引用方式 GB/T 7714	Ruth Thomas E.,Gacitúa G.,Pedro J.B.,et al. Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands[J],2021,15(2).
APA	Ruth Thomas E..,Gacitúa G..,Pedro J.B..,Constance Faith King A..,Markle B..,...&Elisabeth Moser D..(2021).Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands.Cryosphere,15(2).
MLA	Ruth Thomas E.,et al."Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands".Cryosphere 15.2(2021).