Scientists (Liu et al., 2021) have assessed the Pacific North American (PNA) pattern, “largely a mode of internal variability,” is “an important driver of western Arctic sea variability and trends”. The heat-redistributing PNA pattern recently shifted from a negative (1980s) to positive (1995-) phase. This internal shift “induced significant increases in poleward heat” transport, explaining … Continue reading New Study: 75% Of Recent Arctic Sea Ice Decline Is ‘Accounted For’ By An Internal Variability Pattern (PNA)