Recent Retreat Glaciar Nef, Chilean Patagonia, Dated by Lichenometry and Dendrochronology
TLDR
In this paper, the authors present the results of a lichenometric and dendrochronological study of the recent retreat history of Glaciar Nef, an eastern outlet glacier of the Hielo Patag6nico Norte.Abstract:
This paper presents the results of a lichenometric and dendrochronological study of the recent retreat history of Glaciar Nef, an eastern outlet glacier of the Hielo Patag6nico Norte. A 600-yr tree regeneration time, based on maximum tree age in the ancient forest, suggests that the forest-clad lateral moraines in the valley, southeast of the 19th century terminal moraine system, were formed some time before A.D. 1370. Dating estimates suggest that retreat from a 19th century maximum began around 1863, a decade or two earlier than the date established for other glaciers in the region, with glacier thinning near the ice front averaging 1.11 m yr- between 1863-1881. After 1884, retreat seems to have slowed, with glacier thinning averaging 0.09 m yr-~. Lichen and tree dating suggests that the glacier had retreated approximately 500 m by 1938; this estimate is supported by an aerial photograph showing a proglacial lake just beginning to form in 1944. Recent glacier movements around the Hielo Patagonico Norte are discussed and it is concluded that the general trend of glacier retreat around the icefield, beginning in the 1860s to 1870s, is consistent with Northern Hemisphere trends.read more
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Glacier fluctuations in extratropical South America during the past 1000 years
Mariano Masiokas,Andrés Rivera,Andrés Rivera,Lydia E. Espizua,Ricardo Villalba,Silvia Marcela Delgado,Juan Carlos Aravena +6 more
TL;DR: In this paper, the authors presented an updated, extensive review of glacier fluctuations during the past 1000 years in the extratropical Andes of South America between ca. 17° and 55°S.
Journal ArticleDOI
Late Pleistocene and Holocene palaeoclimate and glacier fluctuations in Patagonia
TL;DR: The evidence for Late Pleistocene and Holocene palaeoclimate and glacier fluctuations of the two major icefields in Patagonia, the Hielo Patagonico Norte (47°00′S, 73°39′W) and the hielo Pico Sur (between 48°50′S and 51°30′S) is presented in this article.
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Glacier fluctuations during the past 2000 years
Olga Solomina,Raymond S. Bradley,Vincent Jomelli,Áslaug Geirsdóttir,Darrell S. Kaufman,Johannes Koch,Nicholas P. McKay,Mariano Masiokas,Gifford H. Miller,Atle Nesje,Atle Nesje,Kurt Nicolussi,Lewis A. Owen,Aaron E. Putnam,Aaron E. Putnam,Heinz Wanner,Gregory C. Wiles,Bao Yang +17 more
TL;DR: A global compilation of glacier advances and retreats for the past two millennia grouped by 17 regions (excluding Antarctica) highlights the nature of glacier fluctuations during the late Holocene as mentioned in this paper.
Journal ArticleDOI
The evolution of the Patagonian Ice Sheet from 35 ka to the Present Day (PATICE)
Bethan J. Davies,Christopher M. Darvill,Harold Lovell,Jacob M. Bendle,Julian A. Dowdeswell,Derek Fabel,Juan-Luis García,Alessa Geiger,Alessa Geiger,Neil F. Glasser,Delia M. Gheorghiu,Stephan Harrison,Andrew S. Hein,Michael R. Kaplan,Julian R.V. Martin,Monika Mendelova,Adrian Palmer,Mauri Pelto,Ángel Rodés,Esteban A. Sagredo,Rachel Smedley,John L. Smellie,Varyl R. Thorndycraft +22 more
TL;DR: Patagonian glacial geomorphology and recalibrated chronological data were used to generate new empirical reconstructions of the Patagonian Ice Sheet (PIS) and subsequent ice masses and ice-dammed palaeolakes as mentioned in this paper.
Journal ArticleDOI
The chronology of the last glacial maximum and deglacial events in central Argentine Patagonia
Andrew S. Hein,Nicholas R. J. Hulton,Tibor J. Dunai,David E. Sugden,Michael R. Kaplan,Sheng Xu +5 more
TL;DR: In this article, the authors provide a direct chronology for the age of the Rio Blanco moraine system by utilizing cosmogenic-nuclide surface exposure ages, which indicates the last glacial maximum (LGM) maximum extent occurred by 27-25-ka and subsequent advances occurred at 23-22-ka, 20-18-k, and ca. 18-17-k.
References
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