Complex multi-decadal ice dynamical change inland of marine-terminating glaciers on the Greenland Ice Sheet

Abstract Greenland's future contribution to sea-level rise is strongly dependent on the extent which dynamic perturbations, originating at margin, can drive increased ice flow within ice-sheet interior. However, reported observations of dynamical change distances >~50 km from margin have a very low spatial and temporal resolution. Consequently, likely response ice-sheet's interior oceanic atmospheric warming poorly constrained. Through combining GPS satellite-image-derived velocity measurements, we measure multi-decadal (1993–1997 2014–2018) 45 inland sites, encompassing all regions sheet. We observe an almost ubiquitous acceleration tidewater glaciers in west Greenland, consistent with retreat glacier termini, suggesting that terminus perturbations propagated considerable (>100 km) inland. In contrast, outside Kangerlussuaq, no east Greenland despite near-terminus acceleration, suggest propagation may be limited by influence basal topography geometry. This pattern indicates will spatially complex depend capacity for changes individual outlet termini propagate