Preprints
https://doi.org/10.5194/egusphere-2022-1128
https://doi.org/10.5194/egusphere-2022-1128
01 Nov 2022
 | 01 Nov 2022

Widespread slowdown in thinning rates of West Antarctic Ice Shelves

Fernando Paolo, Alex Gardner, Chad Greene, Johan Nilsson, Michael Schodlok, Nicole Schlegel, and Helen Fricker

Abstract. Antarctica’s floating ice shelves modulate discharge of grounded ice into the ocean by providing backstress. Ice shelf thinning and grounding line retreat have reduced this backstress, driving rapid drawdown of key unstable areas of the Antarctic Ice Sheet. If ice shelf loss continues, it may initiate irreversible glacier retreat through the marine ice sheet instability, leading to significant sea level rise. We analyze 26 years (1992–2017) of changes in satellite-derived Antarctic ice shelf thickness, flow and basal melt rates to construct a time-dependent dataset and investigate temporal variability. We found an overall pattern of thinning around Antarctica, with a thinning slowdown starting around 2008 widespread across the Amundsen, Bellingshausen and Wilkes sectors. We attribute this slowdown partly to modulation in external ocean forcing, likely altered in West Antarctica by negative feedbacks between ice shelf thinning rates and grounded ice flow, and sub-ice-shelf cavity geometry and basal melting. Our satellite-derived ice-shelf thickness and basal melt dataset uses a novel data fusion approach, state-of-the-art satellite-derived velocities, and a new surface mass balance modeling. We test the resolution capability of these data with an ice-ocean modeling experiment.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.

Journal article(s) based on this preprint

23 Aug 2023
| Highlight paper
Widespread slowdown in thinning rates of West Antarctic ice shelves
Fernando S. Paolo, Alex S. Gardner, Chad A. Greene, Johan Nilsson, Michael P. Schodlok, Nicole-Jeanne Schlegel, and Helen A. Fricker
The Cryosphere, 17, 3409–3433, https://doi.org/10.5194/tc-17-3409-2023,https://doi.org/10.5194/tc-17-3409-2023, 2023
Short summary Co-editor-in-chief
Fernando Paolo, Alex Gardner, Chad Greene, Johan Nilsson, Michael Schodlok, Nicole Schlegel, and Helen Fricker

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1128', Anonymous Referee #1, 09 Jan 2023
    • AC1: 'Reply on RC1', Fernando Paolo, 11 Mar 2023
  • RC2: 'Comment on egusphere-2022-1128', Anonymous Referee #2, 11 Feb 2023
    • AC2: 'Reply on RC2', Fernando Paolo, 11 Mar 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1128', Anonymous Referee #1, 09 Jan 2023
    • AC1: 'Reply on RC1', Fernando Paolo, 11 Mar 2023
  • RC2: 'Comment on egusphere-2022-1128', Anonymous Referee #2, 11 Feb 2023
    • AC2: 'Reply on RC2', Fernando Paolo, 11 Mar 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to revisions (further review by editor and referees) (26 Mar 2023) by Nicolas Jourdain
AR by Fernando Paolo on behalf of the Authors (09 Apr 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (18 Apr 2023) by Nicolas Jourdain
RR by Anonymous Referee #1 (03 May 2023)
RR by Anonymous Referee #2 (25 May 2023)
ED: Publish subject to minor revisions (review by editor) (26 May 2023) by Nicolas Jourdain
AR by Fernando Paolo on behalf of the Authors (16 Jun 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (21 Jun 2023) by Nicolas Jourdain
AR by Fernando Paolo on behalf of the Authors (07 Jul 2023)

Journal article(s) based on this preprint

23 Aug 2023
| Highlight paper
Widespread slowdown in thinning rates of West Antarctic ice shelves
Fernando S. Paolo, Alex S. Gardner, Chad A. Greene, Johan Nilsson, Michael P. Schodlok, Nicole-Jeanne Schlegel, and Helen A. Fricker
The Cryosphere, 17, 3409–3433, https://doi.org/10.5194/tc-17-3409-2023,https://doi.org/10.5194/tc-17-3409-2023, 2023
Short summary Co-editor-in-chief
Fernando Paolo, Alex Gardner, Chad Greene, Johan Nilsson, Michael Schodlok, Nicole Schlegel, and Helen Fricker
Fernando Paolo, Alex Gardner, Chad Greene, Johan Nilsson, Michael Schodlok, Nicole Schlegel, and Helen Fricker

Viewed

Total article views: 1,033 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
615 401 17 1,033 10 10
  • HTML: 615
  • PDF: 401
  • XML: 17
  • Total: 1,033
  • BibTeX: 10
  • EndNote: 10
Views and downloads (calculated since 01 Nov 2022)
Cumulative views and downloads (calculated since 01 Nov 2022)

Viewed (geographical distribution)

Total article views: 1,078 (including HTML, PDF, and XML) Thereof 1,078 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 18 Sep 2024
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

This paper presents changes in thickness, flow and basal melt of Antarctic ice shelves over the past 26 years at relatively high resolution. An analysis based on an ocean model investigates the ice-ocean feedbacks. Overall, this is very useful for a large Antarctic research community.
Short summary
We report on a slowdown in the rate of thinning and melting of West Antarctic ice shelves. We present the most comprehensive assessment of the Antarctic ice shelves to date, where we analyze at continental scale the changes in thickness, flow and basal melt over the past 26 years. We also present a novel firn and surface mass balance model for Antarctica, and a time-dependent data set of ice-shelf thickness and basal melt rates at unprecedented resolution.