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