Automated monitoring of subglacial hydrological processes with ground-penetrating radar (GPR) at high temporal resolution: scope and potential pitfalls

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dc.contributor.author Booth, A. D.
dc.contributor.author Hobbs, A.
dc.contributor.author Hubbard, Alun L.
dc.contributor.author Kulessa, B.
dc.date.accessioned 2011-06-09T11:36:29Z
dc.date.available 2011-06-09T11:36:29Z
dc.date.issued 2008-12-18
dc.identifier.citation Booth , A D , Hobbs , A , Hubbard , A L & Kulessa , B 2008 , ' Automated monitoring of subglacial hydrological processes with ground-penetrating radar (GPR) at high temporal resolution: scope and potential pitfalls ' Geophysical Research Letters , vol 35 , no. 24 . , 10.1029/2008GL035855 en
dc.identifier.issn 1944-8007
dc.identifier.other PURE: 166656
dc.identifier.other dspace: 2160/7032
dc.identifier.uri http://hdl.handle.net/2160/7032
dc.description Kulessa, B., A.D. Booth, A. Hobbs, and A.L. Hubbard. (2008). Automated monitoring of subglacial hydrological processes with ground-penetrating radar (GPR) at high temporal resolution: scope and potential pitfalls. Geophysical Research Letters 35 (24), L24502. en
dc.description.abstract We demonstrate that automated GPR techniques can monitor, at repeat timescales of minutes, hydrological processes beneath glaciers experiencing perennial surface melting. At Grubengletscher, Swiss Alps, melt penetrates into porous near-surface ice during the day, modifying the transmitted radar energy and thus the amplitudes of the targeted subglacial reflections. Normalising these reflections by early-time radar arrivals, integrated over a suitable time window, minimises such artefacts. In mid afternoon peak surface ablation, a diagnostic pulse in englacial reflectivity, sharp increases in subglacial reflectivity and glacier surface uplift precede the onset of transient glacier acceleration. Sliding terminates as the glacier surface lowers and the magnitude of subglacial reflectivity decreases. We infer a prominent episode of basal sliding as subglacial water pressure rises rapidly in response to englacially-routed melt delivery, jacking the glacier off its bed and modifying the observed reflectivity. Quantification of such processes is pertinent for any measurement and interpretation of basal reflection strength or bed reflection power from a GPR dataset. Citation: Kulessa, B., A. D. Booth, A. Hobbs, and A. L. Hubbard (2008), Automated monitoring of subglacial hydrological processes with ground-penetrating radar ( GPR) at high temporal resolution: scope and potential pitfalls. en
dc.language.iso eng
dc.relation.ispartof Geophysical Research Letters en
dc.title Automated monitoring of subglacial hydrological processes with ground-penetrating radar (GPR) at high temporal resolution: scope and potential pitfalls en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2008GL035855
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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