globalchange  > 气候变化与战略
DOI: 10.5194/tc-15-1173-2021
论文题名:
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands
作者: Ruth Thomas E.; Gacitúa G.; Pedro J.B.; Constance Faith King A.; Markle B.; Potocki M.; Elisabeth Moser D.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期:2
起始页码: 1173
结束页码: 1186
语种: 英语
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
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.
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164796
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Ruth Thomas E.,Gacitúa G.,Pedro J.B.,et al. Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands[J]. Cryosphere,2021-01-01,15(2)
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