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Modern to glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations

Citation

Goodwin, ID and Roberts, JL and Etheridge, DM and Hellstrom, J and Moy, AD and Ribo, M and Smith, AM, Modern to glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jokulhlaup observations, Geological Society Special Publication, 461 Article SP461.16. ISSN 0305-8719 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 The Author(s)

DOI: doi:10.1144/SP461.16

Abstract

Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, together with subsurface transects of the ice margin obtained using groundpenetrating radar, reveal several lakes and lake-like depressions and the drainage pathways of two jökulhlaup events. Oxygen isotope typing of the meltwater during the most recent (2014) jökulhlaup event, combined with ice margin stratigraphy, enable the identification of ice tunnel melt pathways that exploit the 30–90° dipping basal ice layering. The presence of subglacial meltwater beneath Law Dome during the Holocene to Glacial periods is confirmed by the dendritic drainage pattern in the subglacial morphology and extensive layers of basal regelation ice and subglacial carbonate precipitate deposits found within the Løken Moraines sediments. These subglacial carbonates, including ooid layers, formed from the mixing of glacial meltwater and seawater at 72 ka BP. The combined evidence indicates that the ocean discharge of subglacial meltwater may be variable and/or is periodically blocked by basal freezing events near the ice sheet terminus.

Item Details

Item Type:Refereed Article
Keywords:subglacial meltwater, Law Dome, East Antarctica, jökulhlaup
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
Author:Roberts, JL (Dr Jason Roberts)
Author:Moy, AD (Dr Andrew Moy)
ID Code:118721
Year Published:2017
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-07-18
Last Modified:2018-04-20
Downloads:0

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