Sub-Monthly Mass Change Signal over the llulissat Glacier in Greenland from GRACE-FO Laser Interferometry Data

GRACE(-FO) monthly products are produced routinely using measurements of the orbital motion and the K-Band measurements of the distance between the two satellites. From these solutions, we gained great insight into the water cycle, ice mass balance, and ocean currents for the past twenty years. But what can we do, if we want to study sub­monthly processes? Ghobadi-Far et al. (2022) showed the possibility to use the intersatellite laser ranging measurements on GRACE Follow­On for the analysis of the gravity signal along the orbit. So far, this method has been used to e.g. study the mass change in the Amazon or to study storm surges over the northern sea (Weigelt et. al. 2023). In this study, we focus on the Greenland Ice Sheet and especially the region around Jakobshavn/llulissat glacier.