Towards an estimation of sub-sea-ice platelet-layer volume with multi-frequency electromagnetic induction sounding


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Priska.Hunkeler [ at ] awi.de

Abstract

Ice-platelet clusters modify the heat and mass balance of sea ice near Antarctic ice shelves and provide a unique habitat for ice-associated organisms. The amount and distribution of these ice crystals below the solid sea ice provide insight into melt rates and circulation regimes in the ice-shelf cavities, which are difficult to observe directly. However, little is known about the circum-Antarctic volume of the sub-sea-ice platelet layer, because observations have mostly been limited to point measurements. In this study, we present a new application of multi-frequency electromagnetic (EM) induction sounding to quantify platelet-layer properties. Combining in situ data with the theoretical response yields a bulk platelet-layer conductivity of 1154 +/- 271 mSm–1 and ice-volume fractions of 0.29–0.43. Calibration routines and uncertainties are discussed in detail to facilitate future studies. Our results suggest that multi-frequency EM induction sounding is a promising method to efficiently map platelet-layer volume on a larger scale than has previously been feasible.



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ISI/Scopus peer-reviewed
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Published
Eprint ID
36936
DOI 10.3189/2015AoG69A705

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Hunkeler, P. A. , Hendricks, S. , Hoppmann, M. , Paul, S. and Gerdes, R. (2015): Towards an estimation of sub-sea-ice platelet-layer volume with multi-frequency electromagnetic induction sounding , Annals of Glaciology, 56 (69), pp. 137-146 . doi: 10.3189/2015AoG69A705


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