Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming

摘要: Abstract Knowledge about the future response of Greenland Ice Sheet to global climate change, including ice sheet contributions sea level rise, is important for understanding impact change on society. Such studies rely in model predictions and improved chronological constraints past extents paleoclimatic trends. Many regions are well studied, but northwest especially Melville Bay, being one most terms dynamical mass loss, lack a firm chronology Holocene marginal fluctuations. In this study, we present first comprehensive Bay spanning 73.1–75.7°N based 36 new 10Be exposure ages boulders 39 radiocarbon marine molluscs Little Age moraines. From weighted mean ages, excluding 6 outliers, find that outer coast was deglaciated ∼11.6 ± 0.3 ka (n = 15) margin reached its present-day position 40 km farther inland ∼11.5 ± 0.3 (n = 15). Our results suggest an interval rapid ice-marginal retreat (i.e. collapse) GrIS likely triggered by rapidly rising atmospheric temperatures early Holocene. Additionally, combining dataset with 26 from previous shows restricted extent 9.1 ± 0.2 0.4 ± 0.1 cal BP, which coincides increased surface temperatures. highlight sensitivity towards changes least explored vulnerable Greenland. Furthermore, comparing our already existing models (Huy3 Huy3b) emphasize proximal relevance Agassiz core temperature reconstruction indicates possible warming place simulations.