18 Jan 2023
 | 18 Jan 2023

Brief communication: Comparison of thermistor and digital temperature sensor performance in a mountain permafrost borehole

Lars Widmer, Marcia Phillips, and Chasper Buchli

Abstract. Monitoring mountain permafrost temperatures in boreholes is challenging regarding the resilience and long-term temperature stability of the sensor systems. Whilst resistance thermistors boast a high accuracy, they are prone to drift when exposed to moisture, pressure, or cable strain. Supplementing or replacing them with digital bandgap temperature sensors requires careful analysis of the sensor performance. We carry out a first comparison of two temperature sensor systems under field conditions in mountain permafrost, at 15 identical depths in one borehole. Temperature values, sensing delays and noise levels are compared and discussed. 

Lars Widmer et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1184', Philippe Schoeneich, 17 Mar 2023
    • AC1: 'Reply on RC1', Lars Widmer, 24 May 2023
  • RC2: 'Comment on egusphere-2022-1184', Ivar-Kristian Waarum, 19 Mar 2023
    • AC2: 'Reply on RC2', Lars Widmer, 24 May 2023

Lars Widmer et al.

Lars Widmer et al.


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Short summary
Long-term temperature measurements are challenging to carry out in mountain permafrost boreholes. The widely used resistance thermistors are highly accurate but prone to drift when they are exposed to moisture or the cable connecting them is stretched. We explore the possibility of supplementing them with digital sensors and analyse the performance of both systems at 15 depths in one mountain permafrost borehole.