Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphomelric analysis of glacial cirques

José M. Araos (Corresponding Author), Jacobus P. Le Roux, Michael R. Kaplan, Matteo Spagnolo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and forty-three glacial cirques were studied with reference to 14 morphometric attributes which were analyzed using statistical analysis and GIS methodologies. The cirques were classified into two types using cluster analysis complimented with a composite map based on the attributes, the latter technique that is applied to glacial cirque analysis for the first time. Type 1 cirques are associated with glacial processes isolated from the Southern Patagonian Ice Field (SPIF), developed under locally cold and dry climatic conditions. Type 2 glacial cirques are associated with older, more extensive glacial processes controlled by regional-scale climate variables and the presence of the Pleistocene Ice Sheet. The results show that the development of most of the glacial cirques has been controlled mainly by their aspect, exposure to solar radiation, Southern Hemisphere Westerly winds, and cirque floor slope. Finally, we concluded that our analyses show the evolution of cirques in the Sierra Baguales Mountain Range was not uniform. Cirque glaciers that developed to the west, close to the Southern Patagonian Ice field, have been more dynamic, and therefore their cirques experienced more erosion than those located to the east.
Original languageEnglish
Pages (from-to)357-378
Number of pages21
JournalAndean Geology
Volume45
Issue number3
Early online date31 May 2018
DOIs
Publication statusPublished - Sep 2018

Fingerprint

cirque
Ice
glaciation
ice field
Landforms
Glaciers
Cluster analysis
Solar radiation
Geographic information systems
Erosion
Statistical methods
westerly
landform
Southern Hemisphere
ice sheet
cluster analysis
solar radiation
glacier
statistical analysis
GIS

Keywords

  • Cirque
  • Sierra Baguales Mountain Range
  • glacial geomorphology
  • alpine glaciation
  • Southern Patagonia

Cite this

Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphomelric analysis of glacial cirques. / Araos, José M. (Corresponding Author); Le Roux, Jacobus P.; Kaplan, Michael R.; Spagnolo, Matteo.

In: Andean Geology, Vol. 45, No. 3, 09.2018, p. 357-378.

Research output: Contribution to journalArticle

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abstract = "The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and forty-three glacial cirques were studied with reference to 14 morphometric attributes which were analyzed using statistical analysis and GIS methodologies. The cirques were classified into two types using cluster analysis complimented with a composite map based on the attributes, the latter technique that is applied to glacial cirque analysis for the first time. Type 1 cirques are associated with glacial processes isolated from the Southern Patagonian Ice Field (SPIF), developed under locally cold and dry climatic conditions. Type 2 glacial cirques are associated with older, more extensive glacial processes controlled by regional-scale climate variables and the presence of the Pleistocene Ice Sheet. The results show that the development of most of the glacial cirques has been controlled mainly by their aspect, exposure to solar radiation, Southern Hemisphere Westerly winds, and cirque floor slope. Finally, we concluded that our analyses show the evolution of cirques in the Sierra Baguales Mountain Range was not uniform. Cirque glaciers that developed to the west, close to the Southern Patagonian Ice field, have been more dynamic, and therefore their cirques experienced more erosion than those located to the east.",
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note = "We are grateful for grants from the “Becas de Doctorado en Chile” Scholarships Program and “Gastos Operacionales para Proyecto de Tesis Doctoral” of CONICYT. Juan MacLean and his family kindly allowed access to the farms Las Cumbres and Baguales and Juan Pablo Riquez allowed access to the farm Verdadera Argentina. Juan Carlos Aravena and Rodrigo Villa-Martinez of the Universidad de Magallanes, Jos{\'e} Luis Oyarzun, and Juan Jos{\'e} San Martin provided much-appreciated logistical support. Ricardo Arce, Mauricio Gonzales, and Carly Peltier lent invaluable assistance in field activities. Kaplan is supported by NSF BCS 1263474, and in part by the Climate Center of LDEO and NASA GISS, and Le Roux by Project CONICYT/FONDAP/15090013.This is LDEO contribution XXXX.",
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