Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands
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Published:2021-03-03
Issue:2
Volume:15
Page:1173-1186
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Thomas Elizabeth RuthORCID, Gacitúa Guisella, Pedro Joel B.ORCID, Faith King Amy ConstanceORCID, Markle Bradley, Potocki Mariusz, Moser Dorothea Elisabeth
Abstract
Abstract. 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∘25′19′′ S, 03∘23′27′′ E) in the South
Atlantic, from Peter I Island (68∘51′05′′ S, 90∘30′35′′ W) in the
Bellingshausen Sea, and from Young Island (66∘31′44′′ S, 162∘33′21′′ 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 kg m−3, with close-off depths ranging from 21 to 51 m. Based on the measured density, we estimate that the bottom ages of a 100 m ice core drilled on Peter 1 Island would reach ∼ 1856
CE and ∼ 1874 CE at Young Island.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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