Document Type
Article
Publication Title
Geophysical Research Letters
Rights and Access Note
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s).
Publication Date
6-23-2010
Publication Number
L12501
Volume Number
37
Abstract/ Summary
Large calving events at Greenland's largest outlet glaciers are associated with glacial earthquakes and near instantaneous increases in glacier flow speed. At some glaciers and ice streams, flow is also modulated in a regular way by ocean tidal forcing at the terminus. At Helheim Glacier, analysis of geodetic data shows decimeter-level periodic position variations in response to tidal forcing. However, we also observe transient increases of more than 100% in the glacier's responsiveness to such tidal forcing following glacial-earthquake calving events. The timing and amplitude of the changes correlate strongly with the step-like increases in glacier speed and longitudinal strain rate associated with glacial earthquakes. The enhanced response to the ocean tides may be explained by a temporary disruption of the subglacial drainage system and a concomitant reduction of the friction at the ice-bedrock interface, and suggests a new means by which geodetic data may be used to infer glacier properties. Citation: de Juan, J., et al. (2010), Sudden increase in tidal response linked to calving and acceleration at a large Greenland outlet glacier, Geophys. Res. Lett., 37, L12501, doi: 10.1029/2010GL043289.
Repository Citation
de Juan, Julia; Elósegui, Pedro; Nettles, Meredith; Larsen, Tine B.; Davis, James L.; Hamilton, Gordon S.; Stearns, Leigh A.; Andersen, Morten L.; Ekström, Göran; Ahlstrøm, Andreas P.; Stenseng, Lars; Khan, S. Abbas; and Forsberg, Rene, "Sudden Increase in Tidal Response Linked to Calving and Acceleration at a Large Greenland Outlet Glacier" (2010). Earth Science Faculty Scholarship. 92.
https://digitalcommons.library.umaine.edu/ers_facpub/92
Citation/Publisher Attribution
De Juan, J, Elosegui, P, Nettles, M, Larsen, TB, Davis, JL, Hamilton, GS, Stearns, LA, et al., 2010, Sudden Increase in Tidal Response Linked to Calving and Acceleration at a Large Greenland Outlet Glacier: Geophysical Research Letters, v. 37, L12501. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Publisher Statement
© Copyright 2010 American Geophysical Union
DOI
10.1029/2010GL043289
Version
publisher's version of the published document
Rights Statement
