Surface velocity and ice discharge of the ice cap on King George Island, Antarctica

Osmanoğlu, B. and Braun, M. and Hock, R. and Navarro Valero, Francisco Jose (2013). Surface velocity and ice discharge of the ice cap on King George Island, Antarctica. "Annals of Glaciology", v. 54 (n. 63); pp. 111-119. ISSN 0260-3055. https://doi.org/10.3189/2013AoG63A517.

Description

Title: Surface velocity and ice discharge of the ice cap on King George Island, Antarctica
Author/s:
  • Osmanoğlu, B.
  • Braun, M.
  • Hock, R.
  • Navarro Valero, Francisco Jose
Item Type: Article
Título de Revista/Publicación: Annals of Glaciology
Date: July 2013
ISSN: 0260-3055
Volume: 54
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Matemática Aplicada a las Tecnologías de la Información [hasta 2014]
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 (754kB)

Abstract

Glaciers on King George Island, Antarctica, have shown retreat and surface lowering in recent decades, concurrent with increasing air temperatures. A large portion of the glacier perimeter is ocean-terminating, suggesting possible large mass losses due to calving and submarine melting. Here we estimate the ice discharge into the ocean for the King George Island ice cap. L-band synthetic aperture radar images covering the time-span January 2008 to January 2011 over King George Island are processed using an intensity-tracking algorithm to obtain surface velocity measurements. Pixel offsets from 40 pairs of radar images are analysed and inverted to estimate a weighted average surface velocity field. Ice thicknesses are derived from simple principles of ice flow mechanics using the computed surface velocity fields and in situ thickness data. The maximum ice surface speeds reach mayor que 225 m/yr, and the total ice discharge for the analysed flux gates of King George Island is estimated to be 0.720+/-0.428 Gt/yr, corresponding to a specific mass loss of 0.64+/-0.38 m w.e./yr over the area of the entire ice cap (1127 km2).

More information

Item ID: 29196
DC Identifier: http://oa.upm.es/29196/
OAI Identifier: oai:oa.upm.es:29196
DOI: 10.3189/2013AoG63A517
Official URL: http://www.ingentaconnect.com/content/igsoc/agl/2013/00000054/00000063/art00013?token=00521c426f8ed0c3ae807e2a46762c6b795d36666725532e6e2f2a673f7b2f267738703375686f49b8
Deposited by: Memoria Investigacion
Deposited on: 15 Jun 2014 08:30
Last Modified: 22 Sep 2014 11:44
  • 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