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Artículo

New evidence of glacier surges in the Central Andes of Argentina and Chile

Falaschi, DanielIcon ; Bolch, Tobias; Lenzano, María GabrielaIcon ; Tadono, Takeo; Lo Vecchio Repetto, AndrésIcon ; Lenzano, Luis EduardoIcon
Fecha de publicación: 12/2018
Editorial: SAGE Publications
Revista: Progress In Physical Geography
ISSN: 0309-1333
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente

Resumen

In contrast to the large surge-type glacier clusters widely known for several mountain ranges around the world, the presence of surging glaciers in the Andes has been historically seen as marginal. The improved availability of satellite imagery during the last years facilitates investigating of glaciers in more detail even in remote areas. The purpose of the study was therefore to revisit existing information about surge-type glaciers for the Central Andes of Argentina and Chile (32° 40′–34° 20′ S), to identify and characterize possible further surge-type glaciers, providing new insights into the mass balance and evolution of the velocity of selected glaciers during the surge phase. Based on the analysis of 1962–2015 satellite imagery, historical aerial images, differencing of digital elevation models and a literature survey, we identified 21 surge-type glaciers in the study area. Eleven surge events and six possible surge-type glaciers were identified and described for the first time. The estimation of annual elevation changes of these glaciers for the 2000–2011 period, which encompasses the latest surge events in the region, showed heterogeneous behavior with strongly negative to positive surface elevation change patterns (−1.1 to +1.0 m yr−1). Additionally, we calculated maximum surface velocities of 3±1.9 m d−1 and 3.1±1.1 m d−1 for two of the glaciers during the latest identifiable surge events of 1985–1987 and 2003–2007. Within this glacier cluster, highly variable advance rates (0.01–1 km yr−1) and dissimilar surface velocities at the surge peak (3–35 m d−1) were observed. In comparison with other clusters worldwide, surge-type glaciers in the Central Andes are on average smaller and show minor absolute advances. Generally low velocities and the heterogeneous duration of the surge cycles are common between them and glaciers in the Karakorum, a region with similar climatic characteristics and many known surge-type glaciers. As a definitive assertion concerning the underlying surge mechanism of surges in the Central Andes could not be drawn based on the remote sensing data, this opens more detailed research avenues for surge-type glaciers in the region.
Palabras clave: CENTRAL ANDES , GLACIER ELEVATION CHANGE , GLACIER MASS BALANCE , GLACIER SURFACE VELOCITY , SURGE-TYPE GLACIER
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/86966
URL: https://journals.sagepub.com/doi/10.1177/0309133318803014
DOI: http://dx.doi.org/10.1177/0309133318803014
Colecciones
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Citación
Falaschi, Daniel; Bolch, Tobias; Lenzano, María Gabriela; Tadono, Takeo; Lo Vecchio Repetto, Andrés; et al.; New evidence of glacier surges in the Central Andes of Argentina and Chile; SAGE Publications; Progress In Physical Geography; 42; 6; 12-2018; 792-825
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