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Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica

Citation

Post, AL and Galton-Fenzi, BK and Riddle, MJ and Herraiz-Borreguero, L and O'Brien, PE and Hemer, MA and McMinn, A and Rasch, D and Craven, M, Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica, Continental Shelf Research, 74 pp. 77-87. ISSN 0278-4343 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier Ltd.

DOI: doi:10.1016/j.csr.2013.10.010

Abstract

The surface sedimentary record from six cores collected from beneath the Amery Ice Shelf, East Antarctica, provides a unique view of the sedimentary and oceanographic processes in this sub-ice shelf setting. The composition and age of the surface sediments indicate spatial variations in ice shelf cavity–ocean interaction, which are consistent with patterns of ocean inflow and outflow modelled and observed beneath the ice shelf. Sediments within 100 km of the ice shelf front (site AM01) show the greatest open ocean influence with a young surface age and the highest total diatom abundance, compared to older ages and lower diatom abundances at sites deeper in the cavity (AM03–AM06). The variable marine influence between sites determines the nature of benthic communities. Seabed imagery indicates the existence of sessile suspension feeders in areas of strong marine inflow (site AM01b), while grazers, deposit feeders and a few suspension feeders occur at sites more distal from the shelf calving front where the food supply is lower (sites AM03 and AM04). Understanding the sedimentary and oceanographic processes within the sub-ice shelf environment allows better constraint of interpretations of down core sediment records, an improved understanding of the nature of biological communities in sub-ice shelf environments, and a baseline for determining the sensitivity of the system to any future changes in ocean dynamics.

Item Details

Item Type:Refereed Article
Keywords:Antarctic, ice shelf, diatom, Prydz Bay
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine Geoscience
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Galton-Fenzi, BK (Dr Ben Galton-Fenzi)
Author:Herraiz-Borreguero, L (Dr Laura Herraiz Borreguero)
Author:McMinn, A (Professor Andrew McMinn)
Author:Craven, M (Mr Mike Craven)
ID Code:88928
Year Published:2014
Web of Science® Times Cited:9
Deposited By:IMAS Research and Education Centre
Deposited On:2014-02-20
Last Modified:2017-10-30
Downloads:0

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