First surface velocity maps for glaciers of Monte Tronador, North Patagonian Andes, derived from sequential Pléiades satellite images

• Published in: Journal of Glaciology
• Main Authors: Ruiz, Lucas Ernesto, Berthier, E., Masiokas, Mariano Hugo, Pitte, Pedro Miguel, Villalba, Ricardo
• Format: Article in Journal/Newspaper
• Language: English
• Published: International Glaciological Society
• Subjects: Glacier Flow; Ice Dynamics; Ice Velocity; Remote Sensing; Subglacial Processes; https://purl.org/becyt/ford/1.5; https://purl.org/becyt/ford/1; Argentino; Argentina; Tronador; Ventisquero; Journal of Glaciology
• Online Access: http://hdl.handle.net/11336/38221

We apply cross-correlation to Pléiades satellite images to generate accurate, highresolution monthly surface velocity maps of Monte Tronador glaciers between March and June 2012. Measured surface displacements cover periods as short as 19 days, with a precision of 0.58 m (11 m a–1). These glaciers follow a radial flow pattern, with maximum surface speeds of 390 m a–1 associated with steep icefalls. The lower reaches of the debris-covered tongues of Verde and Casa Pangue glaciers are almost stagnant, whereas Ventisquero Negro, another debris-covered glacier, shows acceleration at the front due to calving into a proglacial lake. Low-elevation debris-covered glacier tongues show increasing velocities at the beginning of the accumulation season, whereas higherelevation, clean-ice tongues reduce their speed during this period. This contrasting behavior is probably in response to an increase in water input to the subglacial system from winter rainfall events at low elevations and a decrease in meltwater production at higher elevations. These sequential velocity maps can help to identify the controls on glacier surface velocity, aid in the delimitation of ice divides and could also contribute to more realistic calibration of ice-flux–mass-balance models in this glacierized area. Fil: Ruiz, Lucas Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina Fil: Berthier, E. Universite de Toulouse; Francia Fil: Masiokas, Mariano Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias ...