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Borehole imagery of meteoric and marine ice layers in the Amery Ice Shelf, East Antarctica

Citation

Craven, M and Carsey, F and Behar, A and Matthews, J and Brand, RJ and Elcheikh, A and Hall, S and Treverrow, A, Borehole imagery of meteoric and marine ice layers in the Amery Ice Shelf, East Antarctica, Journal of Glaciology, 51, (172) pp. 75-84. ISSN 0022-1430 (2005) [Refereed Article]

DOI: doi:10.3189/172756505781829511

Abstract

A real-time video camera probe was deployed in a hot-water drilled borehole through the Amery Ice Shelf, East Antarctica, where a total ice thickness of 480 m included at least 200 m of basal marine ice. Down-looking and side-looking digital video footage showed a striking transition from white bubbly meteoric ice above to dark marine ice below, but the transition was neither microscopically sharp nor flat, indicating the uneven nature (at centimetre scale) of the ice-shelf base upstream where the marine ice first started to accrete. Marine ice features were imaged including platelet structures, cell inclusions, entrained particles, and the interface with sea water at the base. The cells are assumed to be entrained sea water, and were present throughout the lower 100-150m of the marine ice column, becoming larger and more prevalent as the lower surface was approached until, near the base, they became channels large enough that the camera field of view could not contain them. Platelets in the marine ice at depth appeared to be as large as 1-2 cm in diameter. Particles were visible in the borehole meltwater; probably marine and mineral particles liberated by the drill, but their distribution varied with depth.

Item Details

Item Type:Refereed Article
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:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Craven, M (Mr Mike Craven)
Author:Brand, RJ (Mr Russell Brand)
Author:Elcheikh, A (Mr Alan Elcheikh)
Author:Treverrow, A (Dr Adam Treverrow)
ID Code:71443
Year Published:2005
Web of Science® Times Cited:23
Deposited By:Research Division
Deposited On:2011-07-19
Last Modified:2011-07-19
Downloads:0

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