The dataset was acquired at the time-series station Boknis Eck (54.5°N and 10.0°E) at six standard depths (1, 5, 10, 15, 20, 25 m). The dataset contains data for ammonium (sampled with a rosette sampler and measured using a QuAAtro Continuous Segmented Flow Analyzer). The data are from 1979 to 2023.
Thermal conductivity data of coastal sediments were collected during the ALKOR cruise AL591 in April 2023 using the "classic" HeatFlowProbe, where the penetration into the sediment was driven solely by the weight of the probe. The system uses a sensor string that contains 22 thermistors (NTCs) and a heating wire over which a defined heat pulse is released. In-situ temperature and thermal conductivity of the sediment are calculated for each thermistor using the inversion method according to Hartmann & Villinger (2002).
Thermal conductivity data of nearshore sediments were collected during ALKOR cruise AL584 in November 2022 using the VibroHeat system developed by FIELAX GmbH. This system combines a vibrocorer with a sensor string that contains 22 negative temperature coefficient thermistors (NTCs) and a heating wire over which a defined heat pulse is released. In-situ temperature and thermal conductivity of the sediment are calculated for each thermistor using the inversion method according to Hartmann & Villinger (2002) .