Preprints
https://doi.org/10.5194/tc-2023-144
https://doi.org/10.5194/tc-2023-144
29 Sep 2023
 | 29 Sep 2023
Status: a revised version of this preprint is currently under review for the journal TC.

A 3D glacier-dynamics line-plume model to estimate the frontal ablation of Hansbreen, Svalbard

José M. Muñoz-Hermosilla, Jaime Otero, Eva De Andrés, Kaian Shahateet, Francisco Navarro, and Iván Pérez-Doña

Abstract. Frontal ablation is responsible for a large fraction of the mass loss from tidewater glaciers. The main contributors to frontal ablation are iceberg calving and submarine melting, with calving being the largest. However, submarine melting, in addition to its direct contribution to mass loss, also promotes calving through the changes induced in the stress field at the glacier terminus, so both processes should be jointly analysed. Among the factors influencing submarine melting, the formation of a buoyant plume due to the emergence of fresh subglacial water at the glacier grounding line plays a key role. In this study we used Elmer/Ice to develop a 3D glacier dynamics model including calving and subglacial hydrology, coupled with a line-plume model to calculate the calving front position at every time-step. We applied this model to the Hansbreen–Hansbukta glacier–fjord system in Southern Spitsbergen, Svalbard, where a large set of data are available for both glacier and fjord, from September 2008 to March 2011. We found that our 3D model reproduced the expected seasonal cycle of advance-retreat. Besides, the modelled front positions were in good agreement with the observed front positions at the central part of the calving front, with longitudinal differences, on average, below 15 meters for the period from December 2009 to March 2011. But there were regions of the front presenting major differences, specially the eastern margin.

José M. Muñoz-Hermosilla, Jaime Otero, Eva De Andrés, Kaian Shahateet, Francisco Navarro, and Iván Pérez-Doña

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2023-144', Anonymous Referee #1, 01 Dec 2023
    • AC1: 'Reply on RC1', José M. Muñoz-Hermosilla, 15 Dec 2023
  • RC2: 'Comment on tc-2023-144', Anonymous Referee #2, 07 Dec 2023
    • AC2: 'Reply on RC2', José M. Muñoz-Hermosilla, 03 Jan 2024
José M. Muñoz-Hermosilla, Jaime Otero, Eva De Andrés, Kaian Shahateet, Francisco Navarro, and Iván Pérez-Doña
José M. Muñoz-Hermosilla, Jaime Otero, Eva De Andrés, Kaian Shahateet, Francisco Navarro, and Iván Pérez-Doña

Viewed

Total article views: 401 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
307 80 14 401 9 8
  • HTML: 307
  • PDF: 80
  • XML: 14
  • Total: 401
  • BibTeX: 9
  • EndNote: 8
Views and downloads (calculated since 29 Sep 2023)
Cumulative views and downloads (calculated since 29 Sep 2023)

Viewed (geographical distribution)

Total article views: 398 (including HTML, PDF, and XML) Thereof 398 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 25 Feb 2024
Download
Short summary
A large fraction of the mass loss from marine-terminating glaciers is attributed to frontal ablation. In this study, we used a 3D ice-flow model of a real glacier that includes the effects of calving and submarine melting. Over a 30-month simulation, we found that the model reproduced the seasonal cycle for this glacier. Besides, the front positions were in good agreement with observations in the central part of the front, with longitudinal differences, on average, below 15 metres.