eCite Digital Repository

Seawater softening of suture zones inhibits fracture propagation in Antarctic ice shelves

Citation

Kulessa, b and Booth, AD and O'Leary, M and McGrath, D and King, EC and Luckman, AJ and Holland, PR and Jansen, D and Bevan, SL and Thompson, SS and Hubbard, B, Seawater softening of suture zones inhibits fracture propagation in Antarctic ice shelves, Nature Communications, 10, (1) Article 5491. ISSN 2041-1723 (2019) [Refereed Article]


Preview
PDF
6Mb
  

Copyright Statement

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41467-019-13539-x

Abstract

Suture zones are abundant on Antarctic ice shelves and widely observed to impede fracture propagation, greatly enhancing ice-shelf stability. Using seismic and radar observations on the Larsen C Ice Shelf of the Antarctic Peninsula, we confirm that such zones are highly heterogeneous, consisting of multiple meteoric and marine ice bodies of diverse provenance fused together. Here we demonstrate that fracture detainment is predominantly controlled by enhanced seawater content in suture zones, rather than by enhanced temperature as previously thought. We show that interstitial seawater can reduce fracture-driving stress by orders of magnitude, promoting both viscous relaxation and the development of micro cracks, the incidence of which scales inversely with stress intensity. We show how simple analysis of viscous buckles in ice-penetrating radar data can quantify the seawater content of suture zones and their modification of the ice-shelf’s stress regime. By limiting fracture, enhancing stability and restraining continental ice discharge into the ocean, suture zones act as vital regulators of Antarctic mass balance.

Item Details

Item Type:Refereed Article
Keywords:ice shelf stability, Antarctica
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Gravimetrics
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)
UTAS Author:Thompson, SS (Dr Sarah Thompson)
ID Code:140801
Year Published:2019
Web of Science® Times Cited:4
Deposited By:Australian Antarctic Program Partnership
Deposited On:2020-09-09
Last Modified:2020-10-19
Downloads:1 View Download Statistics

Repository Staff Only: item control page