Data for Altimetry-based ice-marginal lake water level changes in Greenland

Description: Greenland-wide dataset showing water level changes of 1,152 ice-marginal lakes from February 2003 to April 2023. The data is provided as a point shapefile and contains lake-specific characteristics, including: i) Lake ID, ii) estimated maximum and minimum water levels, and water level difference (dWL), iii) number of altimetry observations. Additionally, for all lakes experiencing glacial lake outburst floods (GLOFs), the dataset also includes: i) drainage year(s), ii) pre- and post-drainage water levels, iii) largest GLOF. Method: We use airborne and satellite altimetry observations from ATM, ICESat, and ICESat-2 to estimate water level changes of ice-marginal lakes (IMLs) in Greenland from February 2003 to April 2023. We utilize lake outlines from the mapping of Greenland conducted by The Danish Agency for Data Supply and Infrastructure (https://dataforsyningen.dk/data/4771) to spatially filter the altimetry observations. For each IML, we apply statistical filtering to remove outlying observations and subsequently calculate the maximum water level difference (dWL). All lakes with a dWL > 4m (n = 465) are manually inspected for GLOF behavior. For a complete description of the data processing, please refer to the corresponding paper: Dømgaard et al., 2024 (DOI: 10.1038/s43247-024-01522-4), Altimetry-based ice-marginal lake water level changes in Greenland