Cryoegg: development and field trials of a wireless subglacial probe for deep, fast-moving ice

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Authors

Michael Robert Prior-Jones , Elizabeth Bagshaw, Jonathan Lees, Lindsay Clare, Stephen Burrow, Mauro A Werder, Nanna B Karlsson , Dorthe Dahl-Jensen, Thomas R Chudley , Poul Christoffersen

Abstract

Subglacial hydrological systems require innovative technological solutions to access and observe. Wireless sensor platforms can be used to collect and return data, but their performance in deep and fast-moving ice requires quantification. We report experimental results from Cryoegg: a spherical probe that can be deployed into a borehole or moulin and transit through the subglacial hydrological system. The probe measures temperature, pressure and electrical conductivity in-situ and returns all data wirelessly via a radio link. We demonstrate Cryoegg’s utility in studying englacial channels and moulins, including in-situ salt dilution gauging. Cryoegg uses very high frequency (VHF) radio to transmit data to a surface receiving array through up to 1.3 km of cold ice - a significant improvement on the previous design. The wireless transmission uses Wireless M-Bus on 169 MHz; we present a simple radio link budget model for its performance in cold ice and experimentally confirm its validity. Cryoegg has also been tested successfully in temperate ice. The battery capacity allows measurements to be made every two hours for more than a year. Future iterations of the radio system will enable Cryoegg to transmit data through up to 2.5 km of ice.

DOI

https://doi.org/10.31223/osf.io/btphy

Subjects

Earth Sciences, Electrical and Computer Engineering, Engineering, Glaciology, Physical Sciences and Mathematics, Systems and Communications

Keywords

Dates

Published: 2020-06-12 18:53

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License

CC BY Attribution 4.0 International

Additional Metadata

Data Availability (Reason not available):
Data was collected primarily for the purposes of verifying the operation of the instrument. Requests for access to the raw data should be made to Liz Bagshaw - bagshawe@cardiff.ac.uk

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