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Ice thickness measurements and volume estimates for Znosko glacier (Antarctica) using Glabtop model
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  • Cinthya Bello,
  • Wilson Suarez,
  • Rolando Cruz,
  • Nestor Fabian Brondi Rueda
Cinthya Bello
La Molina National Agrarian University

Corresponding Author:cinthyabch@gmail.com

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Wilson Suarez
Servicio Nacional de Meteorología de Hidrología del Perú,Universidad Nacional Agraria La Molina
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Rolando Cruz
National Water Authority of Peru
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Nestor Fabian Brondi Rueda
Instituto Geografico Nacional del Perú
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Around the world there is a consensus of the importance of knowladge the ice thickness distribution and total ice volume for estimating future glacier change for both glaciological and hydrological application, especially the Polar Regions for being important regulators of the global climate system and response rapidly to climate change. This work aimed to estimate the ice thickness distribution and total ice volume of Znosko glacier (King George Island, Antarctic Peninsula) using Glacier Bed Topography (Glabtop) model and ground data. Ground penetrating radar (GPR) measurements were collected in two field campaigns. GPR measurements were used to validate, calibrate (shape factor) and improve the accuracy of the ice thickness distribution model. The ice thickness (GPR) distribution is not uniform over the glacier, which varies from 0 to 155 m. The total stored ice volumen of Znosko glacier in 2020 is estimated to be 0.11 km3. Additionally, the model bounded areas in the bedrock topography below sea level, as a sign of future lake formation. Sensitivity analysis reveal that Glabtop model with a shape factor (f) = 0.5 gave best results when compared with ground penetrating radar (GPR) data measured on Znosko glacier and has an uncertainty range of ± 20.5%.