Preprints
https://doi.org/10.5194/tc-2023-149
https://doi.org/10.5194/tc-2023-149
07 Dec 2023
 | 07 Dec 2023
Status: this preprint is currently under review for the journal TC.

Brief communication: Testing a portable Bullard-type temperature lance confirms highly spatially heterogeneous sediment temperatures under shallow water bodies in the Arctic

Frederieke Miesner, William Lambert Cable, Pier Paul Overduin, and Julia Boike

Abstract. The thermal regime in the sediment column below shallow water bodies in Arctic permafrost controls benthic habitats and permafrost stability. We present a robust, portable device that measures detailed temperature-depth-profiles of the near-surface sediments in less than 1 hour. Test campaigns in the Canadian Arctic and on Svalbard have demonstrated its utility in a range of environments during winter and summer. Measured temperatures were spatially heterogeneous, even within single water bodies. We observed the broadest temperature range in water less than 1 m deep, indicating that the bottom-fast ice zone is overlooked by single measurements in deeper water.

Frederieke Miesner, William Lambert Cable, Pier Paul Overduin, and Julia Boike

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2023-149', Emmanuel Léger, 28 Dec 2023
  • RC2: 'Comment on tc-2023-149', Anonymous Referee #2, 06 Feb 2024
Frederieke Miesner, William Lambert Cable, Pier Paul Overduin, and Julia Boike
Frederieke Miesner, William Lambert Cable, Pier Paul Overduin, and Julia Boike

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Short summary
The temperature in the sediment below Arctic lakes determines the stability of the permafrost and microbial activity. However, measurements are scarce because of the remoteness. We present a robust and portable device to fill this gap. Test campaigns have demonstrated its utility in a range of environments during winter and summer. The measured temperatures show a great variability within and across locations. The data can be used to validate models and estimate potential emissions.