INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
Five years of ice loss monitoring in a debris-covered glacier at the Aconcagua Region of Argentina using semi-continuous GPS geodesy
LENZANO, M. G.; LENZANO, L; TROMBOTTO, D; BARON, J
SERVICIO NACIONAL GEOLOGIA MINERVA
Lugar: Santiago de Chile; Año: 2016 vol. 43
ABSTRACTWe report onice-mass changes at Horcones Inferior Glacier (HIG), a major debris-coveredglacier located in the southern sector of Cerro Aconcagua, Argentina. We usedGPS capabilities to measure elevation, displacement, and surface velocity theglacier during the ablation season from 2009 to 2014. Our results, based on sixsemi-continuous GPS stations along the main axis in the terminal sector of theglacier, show surface movements from 0.4 cmd-1 to 2.7 cmd-1in NE directions, respectively. Concurrently, a 0.8 cmd-1 mean reductionin elevation was recorded over the GPS sites during the 2009-2014 period. GPSprofiles also show a velocity increase ranging from 1.1 cmd-1 in2012 to 1.8 cmd-1 in 2013. Changing surface velocity at HIG may berelated to the presence of thick debris cover in combination with fasterdegradation of the glacier due to thickness loss after the 2003 surge, and theresponse to the climate. Keywords: GPS, debris-covered glacier, change detection, Cerro Aconcagua.