Preprints
https://doi.org/10.5194/egusphere-2025-849
https://doi.org/10.5194/egusphere-2025-849
18 Mar 2025
 | 18 Mar 2025

Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica

Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis

Abstract. The detection of grounding line (GL) positions in Antarctica is crucial for investigating the stability and health of ice sheets and glaciers. In reality the GL position is not fixed and will migrate upstream or downstream in response to varying tidal states on an hourly to daily timescale, or in response to longer-term ice dynamic change. However, the magnitude of short and long-term GL migration is not well characterised in many parts of Antarctica. In this study, we employ the Differential Range Offset Tracking method to measure the tidal GL migration on the Amery Ice Shelf in East Antarctica. We delineate 32 GL positions for the year 2021, covering 1,172 km of coastline. The results show that GL migration in this region is not solely dictated by tide amplitude but is also significantly influenced by ice velocity and subglacial bed topography, providing new insights into the GL dynamics of the region. We also observe significant long-term GL retreat in the eastern part of the Amery Ice Shelf relative to the MEaSUREs Antarctic GL derived from 2000 SAR imagery, with the maximum retreat reaching up to 10 km. Our findings underscore the need for continuous, high-resolution GL monitoring around the whole Antarctic coastline, to improve predictive models of ice sheet responses to climate changes and their subsequent impact on global sea-level rise.

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Journal article(s) based on this preprint

22 Sep 2025
Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica
Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis
The Cryosphere, 19, 3971–3989, https://doi.org/10.5194/tc-19-3971-2025,https://doi.org/10.5194/tc-19-3971-2025, 2025
Short summary
Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-849', Anonymous Referee #1, 18 Apr 2025
    • AC1: 'Reply on RC1', Yikai Zhu, 19 Jun 2025
  • RC2: 'Comment on egusphere-2025-849', Anonymous Referee #2, 21 May 2025
    • AC2: 'Reply on RC2', Yikai Zhu, 19 Jun 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-849', Anonymous Referee #1, 18 Apr 2025
    • AC1: 'Reply on RC1', Yikai Zhu, 19 Jun 2025
  • RC2: 'Comment on egusphere-2025-849', Anonymous Referee #2, 21 May 2025
    • AC2: 'Reply on RC2', Yikai Zhu, 19 Jun 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (24 Jun 2025) by Benjamin Smith
AR by Yikai Zhu on behalf of the Authors (25 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (15 Jul 2025) by Benjamin Smith
AR by Yikai Zhu on behalf of the Authors (24 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (08 Aug 2025) by Benjamin Smith
AR by Yikai Zhu on behalf of the Authors (11 Aug 2025)  Author's response   Manuscript 

Journal article(s) based on this preprint

22 Sep 2025
Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica
Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis
The Cryosphere, 19, 3971–3989, https://doi.org/10.5194/tc-19-3971-2025,https://doi.org/10.5194/tc-19-3971-2025, 2025
Short summary
Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis

Data sets

Additonal code and data for grounding line analysis presented in this article "Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica" Yikai Zhu et al. https://zenodo.org/doi/10.5281/zenodo.14912749

Yikai Zhu, Anna E. Hogg, Andrew Hooper, and Benjamin J. Wallis

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Short summary

This study investigates the long- and short-term changes in the grounding line of the Amery Ice Shelf in East Antarctica, using satellite observations and a method called Differential Range Offset Tracking (DROT). Our findings show how the grounding line behaves in response to tides and other environmental factors, with implications for understanding ice shelf stability. 

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