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Preprints
https://doi.org/10.5194/essd-2020-111
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-111
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Aug 2020

20 Aug 2020

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A revised version of this preprint is currently under review for the journal ESSD.

First ice thickness measurements in Tierra del Fuego at Glacier Schiaparelli, Chile

Guisella Gacitúa1, Christoph Schneider2, Jorge Arigony3, Inti González1,4, Ricardo Jaña5, and Gino Casassa1 Guisella Gacitúa et al.
  • 1Centro de Investigación Gaia Antártica, Universidad de Magallanes, Punta Arenas, Chile
  • 2Geography Department, Humboldt-Universität zu Berlin, Germany
  • 3Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil
  • 4CEQUA, Punta Arenas, Chile
  • 5Instituto Antártico Chileno, Chile, Punta Arenas, Chile

Abstract. Cordillera Darwin in Tierra del Fuego (Chile) remains one of the least studied glaciated regions in the world. However, this region being one of very few terrestrial sites at this latitude in the Southern Hemisphere has the potential to provide key information on the effect of climate variability and climate change on the cryosphere at sub-polar mid-latitudes of the Southern Hemisphere. Glacier Schiaparelli is located at the northern side of the Cordillera Darwin draining the north side of Monte Sarmiento (2187 m asl). Despite being one of the largest glaciers in the Cordillera Darwin no previous in situ observation of its ice thickness had been made neither at this glacier nor at any other location in the Cordillera Darwin. Ice thickness is one of the fundamental parameters to understand glaciers dynamics, constrain ice dynamical modelling and predict glacier evolution. In April 2016 we performed the first successful ice thickness measurements using terrestrial ground- penetrating radar in the ablation area of Glacier Schiaparelli (Gacitúa et al., 2020), https://doi.org/10.1594/PANGAEA.919331. The measurements were made along a transect line perpendicular to the ice flow. Results show a valley shaped bedrock with a maximum ice thickness of 324 m within a distinct glacier trough. The bedrock is located below current sea level for 51 % of the transect measurements with a minimum of −158 m which illustrates that the local topography is subject to considerable glacier-related over-deepening.

Guisella Gacitúa et al.

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Ice thickness observations in Glacier Schiaparelli, Cordillera Darwin, Chile. Guisella Gacitúa, Christoph Schneider, and Gino Casassa https://doi.org/10.1594/PANGAEA.919331

Guisella Gacitúa et al.

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Short summary
We performed the first successful ice thickness measurements using terrestrial ground-penetrating radar in the ablation area of Glacier Schiaparelli (Cordillera Darwin, Tierra del Fuego, Chile). Data are fundamental to understand glaciers dynamics, constrain ice dynamical modelling and predict glacier evolution. Results show a valley shaped bedrock below current sea level, thus further retreat of Glacier Schiaparelli will probably lead to an enlarged and strongly over-deeped proglacial lake.
We performed the first successful ice thickness measurements using terrestrial...
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