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Record #164641:

Mapping thermal and hydrological conditions beneath a polythermal glacier with radio-echo sounding / Luke Copland, Martin J. Sharp.

Title: Mapping thermal and hydrological conditions beneath a polythermal glacier with radio-echo sounding / Luke Copland, Martin J. Sharp.
Author(s): Copland, Luke.
Sharp, Martin J.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(157) (2001)
Abstract: Uses high-resolution radio-echo sounding to study hydrological and thermal regimes of polythermal glacier in Canadian high Arctic. Analyses the presence/absence of an internal reflecting horizon and the spatial variability in bed reflection power (BRP) to identify distribution of warm- and cold-based ice. Finds distribution of BRPr (BRP corrected for variations in ice thickness) not attributable to dependence of attenuation on englacial temperature. Relates BRPr instead to basal conditions, with cold basal ice in the accumulation area and warm basal ice in the ablation area associated with low and high BRPr respectively. Correlates areas of particularly high BRPr over ablation area with observed and predicted locations of subglacial drainage and infers dependence of BRPr on distribution of water at glacier bed. Interprets a continuous internal reflector over areas of high BRPr that dips rapidly close to the glacier margin as boundary between cold ice above and warm ice below.
Notes:

Journal of Glaciology. Vol. 47(157) :232-242 (2001).

Keywords: 551.32 -- Glaciology.
551.324.22 -- Glaciers.
551.324.3 -- Land ice, depth measurements.
551.324.86 -- Glacier streams.
551.324.412 -- Land ice, temperature.
551.321.61 -- Ice sounding, geophysical methods.
E5 -- Glaciology: land ice.
(*41) -- Canada.
(*440.2) -- Nunavut.
(*464.2) -- Ellesmere Island.
SPRI record no.: 164641

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245 10 ‡aMapping thermal and hydrological conditions beneath a polythermal glacier with radio-echo sounding /‡cLuke Copland, Martin J. Sharp.
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500 ## ‡aJournal of Glaciology. Vol. 47(157) :232-242 (2001).
520 3# ‡aUses high-resolution radio-echo sounding to study hydrological and thermal regimes of polythermal glacier in Canadian high Arctic. Analyses the presence/absence of an internal reflecting horizon and the spatial variability in bed reflection power (BRP) to identify distribution of warm- and cold-based ice. Finds distribution of BRPr (BRP corrected for variations in ice thickness) not attributable to dependence of attenuation on englacial temperature. Relates BRPr instead to basal conditions, with cold basal ice in the accumulation area and warm basal ice in the ablation area associated with low and high BRPr respectively. Correlates areas of particularly high BRPr over ablation area with observed and predicted locations of subglacial drainage and infers dependence of BRPr on distribution of water at glacier bed. Interprets a continuous internal reflector over areas of high BRPr that dips rapidly close to the glacier margin as boundary between cold ice above and warm ice below.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324.22 -- Glaciers.‡2udc
650 07 ‡a551.324.3 -- Land ice, depth measurements.‡2udc
650 07 ‡a551.324.86 -- Glacier streams.‡2udc
650 07 ‡a551.324.412 -- Land ice, temperature.‡2udc
650 07 ‡a551.321.61 -- Ice sounding, geophysical methods.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*41) -- Canada.‡2udc
651 #7 ‡a(*440.2) -- Nunavut.‡2udc
651 #7 ‡a(*464.2) -- Ellesmere Island.‡2udc
700 1# ‡aSharp, Martin J.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(157) (2001) ‡wSPRI-20534
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