Articles | Volume 18, issue 3
https://doi.org/10.5194/tc-18-1333-2024
https://doi.org/10.5194/tc-18-1333-2024
Research article
 | Highlight paper
 | 
22 Mar 2024
Research article | Highlight paper |  | 22 Mar 2024

Extreme melting at Greenland's largest floating ice tongue

Ole Zeising, Niklas Neckel, Nils Dörr, Veit Helm, Daniel Steinhage, Ralph Timmermann, and Angelika Humbert

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Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1320', Anonymous Referee #1, 31 Aug 2023
    • AC1: 'Reply on RC1', Ole Zeising, 15 Sep 2023
  • RC2: 'Comment on egusphere-2023-1320', Christoph Mayer, 04 Sep 2023
    • AC2: 'Reply on RC2', Ole Zeising, 15 Sep 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) (18 Sep 2023) by Joseph MacGregor
AR by Ole Zeising on behalf of the Authors (09 Dec 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (18 Dec 2023) by Joseph MacGregor
RR by Christoph Mayer (10 Jan 2024)
RR by Anonymous Referee #1 (12 Jan 2024)
ED: Publish subject to technical corrections (12 Jan 2024) by Joseph MacGregor
AR by Ole Zeising on behalf of the Authors (25 Jan 2024)  Author's response   Manuscript 

Post-review adjustments

AA: Author's adjustment | EA: Editor approval
AA by Ole Zeising on behalf of the Authors (15 Mar 2024)   Author's adjustment   Manuscript
EA: Adjustments approved (15 Mar 2024) by Joseph MacGregor
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Co-editor-in-chief
This study addresses an important question regarding the stability of ice shelves, a question that is highly relevant for Greenland and Antarctica. Using a unique combination of observations, the authors document extensive thinning and extremely high basal melt rates at the floating tongue Nioghalvfjerdsbræ, North Greenland, an important and fast-changing part of the Greenland Ice Sheet. The increase in melt rates are suggested to be caused by an increase in surface melt that is funneling surface water under the ice shelf.
Short summary
The 79° North Glacier in Greenland has experienced significant changes over the last decades. Due to extreme melt rates, the ice has thinned significantly in the vicinity of the grounding line, where a large subglacial channel has formed since 2010. We attribute these changes to warm ocean currents and increased subglacial discharge from surface melt. However, basal melting has decreased since 2018, indicating colder water inflow into the cavity below the glacier.