Temperature measurements at Brandallaguna in March 2021 ...

• Main Authors: Miesner, Frederieke, Cable, William L, Boike, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: active layer; Permafrost; Svalbard; talik; Temperature; Event label; DATE/TIME; LATITUDE; LONGITUDE; ELEVATION; Temperature, soil; Temperature Lance; Modular Observation Solutions for Earth Systems MOSES; Permafrost Research AWI_Perma; Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Arctic; Arctic Ocean; Moses; Talik; Bayelva; Ice; permafrost
• Online Access: https://dx.doi.org/10.1594/pangaea.950782; https://doi.pangaea.de/10.1594/PANGAEA.950782

Bottom water temperatures in lakes and the near-shore Arctic Ocean are usually below 4°C. If the water depth is shallow enough, the sea/lake ice freezes to the sea/lake bed and may significantly shift the mean annual temperature below zero. The temperature regime below the water is therefore directly dependent on the water depth and small changes can have ahuge impact.Measurements of the sediment temperature below shallow water bodies, however, are scarce, and single temperature-chains in boreholes are not sufficient to map the spatial variability. As part of the testing phase of the MOSES project, we tested a new temperature lance to measure temperature profiles in lake sediments. The device is a 1.5m steel lancewith 30 sensors at 5cm spacing that can be pushed or hammered into the sediment. The sensors equilibrate to the surrounding sediment or water within 10min, allowing for repeat measurements to cover the spatial variability. During the spring expedition to the Bayelva long-term observatory near Ny ...