Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.)

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dc.contributor.authorBodin, X.
dc.contributor.authorRojas, F.
dc.contributor.authorBrenning, A.
dc.date.accessioned2025-01-21T00:05:48Z
dc.date.available2025-01-21T00:05:48Z
dc.date.issued2010
dc.description.abstractIn the context of a general retreat of glaciers in the dry Andes, this study focuses on the state and recent evolution of debris-covered glaciers and permafrost-related landforms, especially rock glaciers, in the semiarid to semihumid Laguna Negra catchment, a part of the Andes of central Chile at 33.5 degrees S, that is a key contributor of drinking water for the city of Santiago. We conducted catchment-scale geomorphological mapping, diachronic analysis of 1955 and 1996 orthophotographs and digital elevation models (DEMs), and the analysis of ground temperatures and their sensitivity to climate variation. Rock glaciers dominate spatially and in terms of water storage over glaciers (area ratio: 1.7:1; ratio of water equivalents: 1.5:1). An intense downwasting has affected both debris-covered and exposed glacier components in the Punta Negra subcatchment, a process that is associated with the growth of numerous thermokarst depressions. The altitudinal transect of ground temperature suggest that permafrost is widespread above similar to 4000 m asl, although it can also occur at lower elevations on sheltered footslopes and within rock glaciers. The sensitivity analysis indicates that the near-surface ground thermal regime at high altitudes is strongly influenced by the snow cover disappearance date, which may therefore constitute an important control on the effect of climatic warming. (C) 2010 Elsevier B.V. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.geomorph.2010.02.016
dc.identifier.eissn1872-695X
dc.identifier.issn0169-555X
dc.identifier.urihttps://doi.org/10.1016/j.geomorph.2010.02.016
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95563
dc.identifier.wosidWOS:000277904600020
dc.issue.numero3-4
dc.language.isoen
dc.pagina.final464
dc.pagina.inicio453
dc.revistaGeomorphology
dc.rightsacceso restringido
dc.subjectRock glacier
dc.subjectDebris-covered glacier
dc.subjectThermokarst
dc.subjectDownwasting
dc.subjectMountain permafrost
dc.subjectGround temperature monitoring
dc.subject.ods15 Life on Land
dc.subject.ods14 Life Below Water
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa14 Vida submarina
dc.subject.odspa13 Acción por el clima
dc.titleStatus and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.)
dc.typeartículo
dc.volumen118
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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