Bathymetry of Lake Motzfeldt (South Greenland)

This dataset contains bathymetric measurements of Lake Motzfeldt in South Greenland. The measurements were conducted with a Kongsberg EA440 single-beam echo-sounder with a 38|200 khz combi transducer. The instrument was mounted to an aluminium frame attached to an inflatable boat. An Emlid Reach RS3 GNSS receiver was used for geolocation. The measurements were corrected for sound velocity based on a CTD measurement in the lake. The data was manually cleaned from outliers. The data was aquired during two field campaings in August 2024 and August 2025. We provide the cleaned xyz data in a .csv format for both frequencies and both field campaings. Additionally, we provide xyz points for the shoreline of the lake. LM_2024_38khz.csv LM_2024_200khz.csv LM_2025_38khz.csv LM_2025_200khz.csv LM_shoreline.csv Furthermore, we provide gridded bathymetry in .tif format for the 200 khz frequency at 25 m resolution: LM_bathy_grid_positive.tif The grid files were produced using the Python implementation of the Generic Mapping Tool (PyGMT), by calculating a block-median with a grid cell-size of 25 m, before applying a spline interpolation function with a tension factor of 0.6. The coordinate system is EPSG 3413. Reference: Vacek, F., Nick, F. M., Benn, D., Zwarts, M. P. A., Immerzeel, W., and van de Wal, R. S. W.: Contrasting dynamics of lake- and marine-terminating glaciers under same climatic conditions, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-5733, 2025.