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| DOI | 10.1017/JOG.2016.73 | ||||
| Año | 2016 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
For the Andes Cordillera, where observed mass-balance records are sparse, long-term glacier velocity measurements potentially represent a useful tool for assessing glacier health. Utilising manual and automatic feature-tracking techniques applied to Corona, Landsat and ASTER satellite imagery, this paper presents surface velocity fluctuations for Glaciar Universidad between 1967 and 1969, and 1985 and 2015, the longest such time series available for the Andes Cordillera, outside Patagonia. This time series reveals an increase in the surface velocities of the main glacier trunk between 1967 and 1987 (similar to 90%) followed by a deceleration between 1987 and 2015 (similar to 80%), with ice velocities observed between 2014 and 2015 possibly representing a 48 a low. In response to the surface velocity fluctuations, the glacier front advanced between 1985 and 1992 (cumulative change of 137 +/- 14 m), and again to a lesser magnitude during the 1996-98 and 2004-08 periods. Although having exhibited possible surge behaviour during the 1940s, the synchrony of the glacier changes presented for Glaciar Universidad with those reported for nearby glaciers, suggests that this glacier is responding to climatic trends. If the above scenario is true, the results indicate a general pattern of increasingly negative glacier mass-balance conditions since the late 1980s.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Wilson, Ryan | Hombre |
Centro de Estudios Científicos - Chile
Aberystwyth Univ - Reino Unido Aberystwyth University - Reino Unido |
| 2 | Mernild, Sebastian H. | Hombre |
Universidad de Magallanes - Chile
Sogn Og Fjordane Univ Coll - Noruega Fjordane University College - Noruega |
| 3 | Malmros, Jeppe K. | Hombre |
Univ Copenhagen - Dinamarca
Københavns Universitet - Dinamarca |
| 4 | BRAVO-URZUA, CLAUDIO IGNACIO | Hombre |
Centro de Estudios Científicos - Chile
|
| 5 | CARRION-OLIVAREZ, DANIELA ALEJANDRA | Mujer |
Centro de Estudios Científicos - Chile
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| Fuente |
|---|
| CONICYT |
| National Natural Science Foundation of China |
| Universidad de Chile |
| Fondo Nacional de Desarrollo Científico y Tecnológico |
| Comisión Nacional de Investigación Científica y Tecnológica |
| Centro de Estudios Científicos |
| Comisión Nacional de Investigación CientÃfica y Tecnológica |
| National Aeronautics and Space Administration |
| Fondo Nacional de Desarrollo CientÃfico y Tecnológico |
| CECs |
| Natural Environment Research Council |
| Research Councils UK |
| Natural Environment Research Council (NERC) |
| U.S. Geological Survey |
| Research Councils UK (RCUK) |
| National Science Foundation of Chile |
| Tecnol?gica de Chile |
| Chilean Government through the Centers of Excellence Base Financing Program of Comision Nacional de Investigacion y Tecnologica de Chile (CONICYT) |
| National Science Foundation of Chile (FONDECYT) |
| Centro de Estudios Cient?ficos |
| Agradecimiento |
|---|
| We thank the anonymous reviewers for their valuable critique of this article. The authors gratefully acknowledge the U.S. Geological Survey (Landsat imagery) and NASA Land Processes Distributed Active Archive centre (ASTER imagery) for free data access. We also thank Centro de Estudios Cientificos (CECs) for the surveying of dGPS points during field campaigns conducted in 2009 and 2010. This work was primarily supported by CECs, which is funded by the Chilean Government through the Centers of Excellence Base Financing Program of Comision Nacional de Investigacion y Tecnologica de Chile (CONICYT). Additional funding for this publication was also made available from: (1) the National Science Foundation of Chile (FONDECYT) under Grant Agreement #1140172; and (2) the Research Councils UK (RCUK), Natural Environment Research Council (NERC) and CONICYT under project code NE/N020693/1. RW outlined the study, analysed the data and wrote the manuscript, with revisions from SHM, and JKM provided the frontal fluctuations data. CB and DC assisted with data collection and analysis. We would also like to thank Monica Pinto (University of Chile) whose work on Glaciar Universidad provided inspiration for this study. |
| We thank the anonymous reviewers for their valuable critique of this article. The authors gratefully acknowledge the U.S. Geological Survey (Landsat imagery) and NASA Land Processes Distributed Active Archive centre (ASTER imagery) for free data access. We also thank Centro de Estudios Científicos (CECs) for the surveying of dGPS points during field campaigns conducted in 2009 and 2010. This work was primarily supported by CECs, which is funded by the Chilean Government through the Centers of Excellence Base Financing Program of Comisión Nacional de Investigación y Tecnológica de Chile (CONICYT). Additional funding for this publication was also made available from: (1) the National Science Foundation of Chile (FONDECYT) under Grant Agreement #1140172; and (2) the Research Councils UK (RCUK), Natural Environment Research Council (NERC) and CONICYT under project code NE/N020693/1. RW outlined the study, analysed the data and wrote the manuscript, with revisions from SHM, and JKM provided the frontal fluctuations data. CB and DC assisted with data collection and analysis. We would also like to thank Monica Pinto (University of Chile) whose work on Glaciar Universidad provided inspiration for this study. |