Instruments and Methods
Techniques for measuring high-resolution firn density profiles: case study from Kongsvegen, Svalbard
Authors: Hawley, Robert L.; Brandt, Ola; Morris, Elizabeth M.; Kohler, Jack; Shepherd, Andrew P.; Wingham, Duncan J.
Source: Journal of Glaciology, Volume 54, Number 186, July 2008 , pp. 463-468(6)
Publisher: International Glaciological Society
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 (>30 cm) variation in the gravimetric densities of each core section. Fine-scale features (<10 cm) 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.
Document Type: Research Article
Publication date: July 1, 2008
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