Surface velocity and mass balance of Livingston Island ice cap, Antarctica

Osmanoglu, Batuhan and Navarro Valero, Francisco Jose and Hock, Regine and Braun, M. and Corcuera Labrado, Maria Isabel (2014). Surface velocity and mass balance of Livingston Island ice cap, Antarctica. "The Cryosphere", v. 8 (n. 5); pp. 1807-1823. ISSN 1994-0416. https://doi.org/10.5194/tc-8-1807-2014.

Description

Title: Surface velocity and mass balance of Livingston Island ice cap, Antarctica
Author/s:
  • Osmanoglu, Batuhan
  • Navarro Valero, Francisco Jose
  • Hock, Regine
  • Braun, M.
  • Corcuera Labrado, Maria Isabel
Item Type: Article
Título de Revista/Publicación: The Cryosphere
Date: October 2014
ISSN: 1994-0416
Volume: 8
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Matemática Aplicada a las Tecnologías de la Información y las Comunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (3MB) | Preview

Abstract

The mass budget of the ice caps surrounding the Antarctica Peninsula and, in particular, the partitioning of its main components are poorly known. Here we approximate frontal ablation (i.e. the sum of mass losses by calving and submarine melt) and surface mass balance of the ice cap of Livingston Island, the second largest island in the South Shetland Islands archipelago, and analyse variations in surface velocity for the period 2007–2011. Velocities are obtained from feature tracking using 25 PALSAR-1 images, and used in conjunction with estimates of glacier ice thicknesses inferred from principles of glacier dynamics and ground-penetrating radar observations to estimate frontal ablation rates by a flux-gate approach. Glacier-wide surface mass-balance rates are approximated from in situ observations on two glaciers of the ice cap. Within the limitations of the large uncertainties mostly due to unknown ice thicknesses at the flux gates, we find that frontal ablation (−509 ± 263 Mt yr−1, equivalent to −0.73 ± 0.38 m w.e. yr−1 over the ice cap area of 697 km2) and surface ablation (−0.73 ± 0.10 m w.e. yr−1) contribute similar shares to total ablation (−1.46 ± 0.39 m w.e. yr−1). Total mass change (δM = −0.67 ± 0.40 m w.e. yr−1) is negative despite a slightly positive surface mass balance (0.06 ± 0.14 m w.e. yr−1). We find large interannual and, for some basins, pronounced seasonal variations in surface velocities at the flux gates, with higher velocities in summer than in winter. Associated variations in frontal ablation (of ~237 Mt yr−1; −0.34 m w.e. yr−1) highlight the importance of taking into account the seasonality in ice velocities when computing frontal ablation with a flux-gate approach.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainCTM2011-28980UnspecifiedUnspecifiedUnspecified

More information

Item ID: 37451
DC Identifier: http://oa.upm.es/37451/
OAI Identifier: oai:oa.upm.es:37451
DOI: 10.5194/tc-8-1807-2014
Official URL: http://www.the-cryosphere.net/8/1807/2014/tc-8-1807-2014.html
Deposited by: Memoria Investigacion
Deposited on: 05 Oct 2015 16:52
Last Modified: 05 Oct 2015 16:52
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM