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Characteristics of a crater glacier at Ushkovsky volcano, Kamchatka, Russia, as revealed by the physical properties of ice cores and borehole thermometry

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Title: Characteristics of a crater glacier at Ushkovsky volcano, Kamchatka, Russia, as revealed by the physical properties of ice cores and borehole thermometry
Authors: Shiraiwa, Takayuki Browse this author →KAKEN DB
Murav'yev, Yaroslav D. Browse this author
Kameda, Takao Browse this author →KAKEN DB
Nishio, Fumihiko Browse this author →KAKEN DB
Toyama, Yoko Browse this author
Takahashi, Akiyoshi Browse this author
Ovsyannikov, Alexander A. Browse this author
Salamatin, Andrey N. Browse this author
Yamagata, Kotaro Browse this author →KAKEN DB
Issue Date: Jul-2001
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 47
Issue: 158
Start Page: 423
End Page: 432
Publisher DOI: 10.3189/172756501781832061
Abstract: A glacier at the summit of Ushkovskyvolcano, Kamchatka peninsula, Russia, was studied in order to obtain information about the physical characteristics of a glacier that fills a volcanic crater. The glacier has a gentle surface and a concave basal profile with a maximum measured depth of 240 m at site K2. The annual accumulation rate was 0.54 m a-1 w.e., and the 10 m depth temperature was -15.8°C. A 211.70 m long ice core drilled at K2 indicates that (1) the site is categorized as a percolation zone, (2) the stress field in the glacier changes at 180 m depth from vertical and longitudinal compression with transversal extension, which is divergent flow, to a shear-dominated stress field, and (3) the frequent occurrence of ash layers can be a good tool for dating the ice core. The borehole temperature profiles were considered to be non-stationary, but the linear profile made it possible to estimate the basal temperature and the geothermal heat flux at K2. Assuming constant surface and the basal boundary-conditions, we constructed two depth-age relationships at K2. These predicted that the bottom ages of the ice core were about 511 or 603 years.
Rights: © 2001 International Glaciological Society
Type: article
URI: http://hdl.handle.net/2115/50877
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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