Multi-year monitoring of rift propagation on the Amery Ice Shelf, East Antarctica

• Published in: Geophysical Research Letters
• Main Authors: Fricker, HA, Young, NW, Coleman, R, Bassis, JN, Minster, JB
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union 2005
• Subjects: Earth Sciences; Physical Geography and Environmental Geoscience; Glaciology; East Antarctica; Amery; Amery Ice Shelf; Antarc*; Antarctica; Ice Shelf
• Online Access: https://doi.org/10.1029/2004GL021036; http://ecite.utas.edu.au/32999

We use satellite imagery from four sensors (Multi-angle Imaging SpectroRadiometer (MISR), Enhanced Thematic Mapper (ETM), and RADARSAT and ERS Synthetic Aperture Radar (SAR) to monitor the lengths of two rifts on the Amery Ice Shelf, from 1996 to 2004. We find that the rifts have each been propagating at a steady annual rate for the past 5 years. Superimposed on this steady rate is a seasonal signal, where propagation rates are significantly higher in the summer period (i.e., September-April) than in the winter period (i.e., April-September). Possible causes of this summer-winter effect are changing properties of the ice mlange, which fills the rifts, and seasonal changes in ocean circulation beneath the ice shelf. Copyright 2005 by the American Geophysical Union.