Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Geometry and recent evolution of Hurd Peninsula glaciers, Livingston Island, Antarctica
Año:2012
Áreas de investigación
  • Geofísica
Datos
Descripción
We present a set of results obtained from georadar surveys carried out since 1999/2000 campaign, using radars of low (20-25 MHz) and high (200 MHz) frequencies on Johnsons and Hurd glaciers (Livingston Island, Antarctica). The radar records, together with other dynamical and geomorphological evidences, suggest that these glaciers have a polythermal structure, contrary to the usual assumption that glaciers on Livingston Island are temperate. The estimated ice volume of the Johnsons-Hurd ice cap is 0.968 ± 0.026 km³, for an area of 10.34 ± 0.03 km², with a mean ice thickness of 93.6 ± 2.5 m and a maximum of ca. 200 m. The subglacial topography was obtained combining the ice thicknesses data with the surface topography. The latter was measured using total station and differential GPS during 1999/2000 and 2000/2001, in a collaborative project with a research group of the Universitat de Barcelona. By comparing our data with the 1956 topography, constructed from aerial photographs taken by the British Antarctic Survey, we estimate that during the period 1956-2000 the volume of Johnsons-Hurd has decreased by 10.0 ± 4.5 %, which is equivalent to a sustained average annual mass balance of -0.23 ± 0.10 m w.e. By combining ice calving estimates with surface mass balance measurements, we observe that, in spite of sustained regional warming, the volume loss during the last decade has slowed down to values of -0.09 and -0.15 m w.e. for Johnsons and Hurd glaciers, respectively.
Internacional
No
Nombre congreso
7ª Asamblea Hispano Portuguesa de Geodesia y Geofisica
Tipo de participación
960
Lugar del congreso
San Sebastián
Revisores
Si
ISBN o ISSN
DOI
Fecha inicio congreso
25/06/2012
Fecha fin congreso
28/06/2012
Desde la página
299
Hasta la página
299
Título de las actas
7ª Asamblea Hispano Portuguesa de Geodesia y Geofisica
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Javier Jesus Lapazaran Izargain (UPM)
  • Autor: Francisco Jose Navarro Valero (UPM)
  • Autor: Jaime Otero Garcia (UPM)
  • Autor: Francisco Machío (Universidad Pontificia de Salamanca)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Simulación Numérica en Ciencias e Ingeniería
  • Departamento: Matemática Aplicada a las Tecnologías de la Información
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)