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Techniques for measuring high-resolution firn density profiles: case study from Kongsvegen, Svalbard

Hawley, RL; Brandt, O; Morris, EM; Kohler, J; Shepherd, AP; Wingham, DJ; (2008) Techniques for measuring high-resolution firn density profiles: case study from Kongsvegen, Svalbard. J GLACIOL , 54 (186) 463 - 468.

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Abstract

On an 11 m firn/ice core from Kongsvegen, Svalbard, we have used dielectric profiling (DEP) to measure electrical properties, and digital photography to measure a core optical stratigraphy (COS) profile. We also used a neutron-scattering probe (NP) to measure a density profile in the borehole from which the core was extracted. The NP- and DEP-derived density profiles were similar, showing largescale (>30cm) variation in the gravimetric densities of each core section. Fine-scale features (<10cm) are well characterized by the COS record and are seen at a slightly lower resolution in both the DEP and NP records, which show increasing smoothing. A combination of the density accuracy of NP and the spatial resolution of COS provides a useful method of evaluating the shallow-density profile of a glacier, improving paleoclimate interpretation, mass-balance measurement and interpretation of radar returns.

Type:Article
Title:Techniques for measuring high-resolution firn density profiles: case study from Kongsvegen, Svalbard
Keywords:BOREHOLE OPTICAL STRATIGRAPHY, GROUND-PENETRATING RADAR, POLAR FIRN, ICE-CORE, NEUTRON-SCATTERING, PERMITTIVITY, CONDUCTIVITY, INSTRUMENTS
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Earth Sciences

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