Preprints
https://doi.org/10.5194/cp-2016-116
https://doi.org/10.5194/cp-2016-116
30 Nov 2016
 | 30 Nov 2016
Status: this preprint has been retracted.Please read the editorial note.

Constraints on glacier flow from temperature-depth profiles in the ice. Application to EPICA Dome C.

Ignacio Hermoso de Mendoza, Jean-Claude Mareschal, and Hugo Beltrami

Abstract. A one-dimensional (1-D) ice flow and heat conduction model is used to calculate the temperature and heat flux profiles in the ice and to constrain the parameters characterizing the ice flow and the thermal boundary conditions at the Dome C drilling site in East Antarctica. We use the reconstructions of ice accumulation, glacier height and air surface temperature histories as boundary conditions to calculate the ice temperature profile. The temperature profile also depends on a set of poorly known parameters, the ice velocity profile and magnitude, basal heat flux, and air-ice surfaces temperature coupling. We use Monte Carlo methods to search the parameters' space of the model, compare the model output with the temperature data, and find probability distributions for the unknown parameters. We could not determine the sliding ratio because it has no effect on the thermal profile, but we could constrain the flux function parameter p that determines the velocity profile. We determined the basal heat flux qb = 49.0  ± 2.7 (2σ)m W m−2, almost equal to the apparent value. We found an ice surface velocity of vsur = 2.6 ± 1.9 (2σ)m y−1 and an air-ice temperature coupling of 0.8 ± 1.0(2σ)K. Our study confirms that the heat flux is low and does not destabilize the ice sheet in east Antarctica.

This preprint has been retracted.

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.
Ignacio Hermoso de Mendoza, Jean-Claude Mareschal, and Hugo Beltrami

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Ignacio Hermoso de Mendoza, Jean-Claude Mareschal, and Hugo Beltrami
Ignacio Hermoso de Mendoza, Jean-Claude Mareschal, and Hugo Beltrami

Viewed

Total article views: 1,246 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
776 325 145 1,246 78 112
  • HTML: 776
  • PDF: 325
  • XML: 145
  • Total: 1,246
  • BibTeX: 78
  • EndNote: 112
Views and downloads (calculated since 30 Nov 2016)
Cumulative views and downloads (calculated since 30 Nov 2016)

Viewed (geographical distribution)

Total article views: 1,231 (including HTML, PDF, and XML) Thereof 1,224 with geography defined and 7 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 20 May 2024
Download

This preprint has been retracted. Please read the editorial note.

Short summary
We simulated ice flow and heat conduction at the Dome C site in Antarctica with a 1D numerical model, using as inputs past conditions at the site over the past 800Ky. Several model parameters (basal heat flux, flux function parameter, ice surface velocity and air-ice temperature offset) are set as free parameters whose values yield different temperature profiles that we can compare to that at Dome C. Using this criteria, we estimate these free parameters through Montecarlo methods.