The Greenland Ice Sheet (GIS) is currently retreating at an alarming rate, potentially impacting climate on a hemispheric to global scale. With Greenland, the Arctic is the largest regional land ice source having contributed to global sea level rise over the past decade. However, interaction between the GIS and ocean and atmospheric circulation (e.g. Atlantic Multidecadal Oscillation) is not yet well understood. Moreover, much debate also still exists about the advance and extent of the GIS over the shelf during past glaciations. This session strives towards improving our knowledge of the impact of the GIS on ocean circulation and atmospheric conditions – and vice versa – under changing climate. Both the study of modern conditions and documentation of changes over longer, historical and geological, time scale are crucial for improving our understanding. With this session we thus invite contributions from all relevant fields of research, including modern and historical observations as well as results from geological and modeling studies.