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Diurnal variations in vertical strain observed in a temperate valley glacier
| Title: | Diurnal variations in vertical strain observed in a temperate valley glacier |
| Authors: | Sugiyama, Shin1 Browse this author →KAKEN DB | | Gudmundsson, G. Hilmar Browse this author |
| Authors(alt): | 杉山, 慎1 |
| Issue Date: | 30-Jan-2003 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical Research Letters |
| Volume: | 30 |
| Issue: | 2 |
| Publisher DOI: | 10.1029/2002GL016160 |
| Abstract: | During a period of diurnal fluctuations in glacial flows speed, vertical strain was measured with sub-daily temporal resolution on Unteraargletscher, Switzerland. Mean vertical strain in boreholes up to 300-m deep out of 400-m-thick ice was found to fluctuate diurnally. Vertical strain rates were extensile in the daytime and compressive at night, with a magnitude of up to 10-3 day-1. Horizontal surface strain was observed to fluctuate in a manner consistent with the vertical deformation. Diurnal surface flow speed variations correlated well with basal water pressures suggesting a basal control on temporal flow variations. Nevertheless, the strain rate measurements indicated that changes in surface flow speed is affected by internal ice deformation and not a direct measure of local basal motion. Basal conditions in the surrounding neighborhood and their temporal variations take important role in short-term glacial flow fluctuations. |
| Description: | An edited version of this paper was published by AGU.
Copyright 2003, American Geophysical Union, Geophysical Research Letters, 30-2 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/4854 |
| 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)
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Submitter: 杉山 慎
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