Climatic control on the retreat of the Laurentide Ice Sheet margin in easternmost Québec–Labrador (Canada) revealed by cosmogenic nuclide exposure dating

The Laurentide Ice Sheet (LIS) was the largest ice sheet in Northern Hemisphere during last glacial cycle. effects of its demise on global climate and sea-level changes subsequent deglaciation are unequivocal. Understanding interplay between sheets long-term or short-term (e.g. abrupt) climatic events is therefore crucial for predicting future rates melting their potential contribution to changes. Here, we present 37 new 10Be surface exposure ages from easternmost Québec–Labrador that allow us identify close ties regional history climate. These results reveal LIS disconnected Newfoundland Cap by ~14.1 ka. Samples collected moraine boulders indicate this event followed five major stillstands and/or readvance stages margin. Integrating our with those earlier studies allows depict a temporal framework including at ~12.9, ~11.5, ~10.4, ~9.3 ~8.4–8.2 highlight strong sensitivity temperature Hemisphere, as documented continental margin stabilizations coincide abrupt cooling recorded Greenland cores. observations support idea negative feedback mechanism induced meltwater forcings into North Atlantic Ocean which, turn, provoked repeated cold reversals Younger Dryas early Holocene.