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Glacier mass balance interpreted from biological analysis of firn cores in the Chilean lake district

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Title: Glacier mass balance interpreted from biological analysis of firn cores in the Chilean lake district
Authors: santibañez, P. Browse this author
Kohshima, S. Browse this author
Scheihing, R. Browse this author
Jaramillo, J. Browse this author
Shiraiwa, Takayuki Browse this author →KAKEN DB
Matoba, Sumito Browse this author →KAKEN DB
Kanda, D. Browse this author
Labarca, P. Browse this author
Casassa, G. Browse this author
Issue Date: Jul-2008
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 54
Issue: 186
Start Page: 452
End Page: 462
Publisher DOI: 10.3189/002214308785837101
Abstract: The first analyses of biological components in glaciers of the Chilean lake district are presented based on microalgae biovolume, pollen and other microorganisms detected in shallow ( 10 m) firn/ice cores. Three cores were retrieved, two at Volca´n Mocho-Choshuenco (398550 S, 728020W; summit at 2422ma.s.l; east glacier at 2000ma.s.l.), and one at the summit of Volca´n Osorno (418060 S, 728300W; 2652ma.s.l.). Microalgae, protozoa and pollen quantified in the samples obtained from the two summit cores show clear fluctuations interpreted as seasonal signs. In contrast, dD and many chemical species from the summit cores show strong dampening at depth, probably due to water percolation. The limited information provided by isotopic and chemical analyses is used to support the seasonal interpretation of biological parameters from the summit cores, with microorganism maxima inferred to occur in summer and pollen maxima in spring. A good comparison is found between massbalance estimations from the Volca´n Mocho-Choshuenco summit core and values obtained near that site by means of the stake method. It is concluded that biological analyses of firn/ice cores provide reliable estimations of annual and seasonal markers from these temperate glaciers.
Rights: © 2008 International Glaciological Society
Type: article
URI: http://hdl.handle.net/2115/50876
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 白岩 孝行

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