Volume changes on Pio XI glacier, Patagonia: 1975-1995
Author
dc.contributor.author
Rivera Ibáñez, Sergio
Author
dc.contributor.author
Casassa, Gino
Admission date
dc.date.accessioned
2018-12-17T12:41:19Z
Available date
dc.date.available
2018-12-17T12:41:19Z
Publication date
dc.date.issued
1999
Cita de ítem
dc.identifier.citation
Global and Planetary Change 22 (1999) 233–244
Identifier
dc.identifier.issn
09218181
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/153297
Abstract
dc.description.abstract
Pio XI glacier, with an area of 1263 km 2 and a length of 65.7 km, is the largest of the Southern Patagonia Icefield (SPD. During the period 1945-1995 it experienced a net advance of ca. 10 km., a unique behavior considering thai virtually all neighboring glaciers are retreating. Two maps at 1:50,000 scale, produced from 1975 and 1995 aerial photography, are used to compute volume changes for this glacier. This is done by digitizing the maps and creating digital terrain models at 200-m resolution. Volume changes for a reduced sample area, in combination with the hypsometric curve of the glacier, are analyzed in terms of the recent advance experienced by the glacier. The sample area (4.5% of the glacier area) for the volume change analysis shows an average thickening on the glacier for the period 1975-1995 of 44.1 m. which represents 2.2 m a -1. The corresponding volume change was 2.52 km -3, with a larger thickening in the lower part of the ablation area. The hypsometric curve of the g