Fig. 9: Changes of JJA-mean heatwave intensity measured by EHF from the AGCM experiment Exp-(IPO+AMO+ENSO).
From: Intensification of heatwaves in China in recent decades: Roles of climate modes

a The differences between the last 20-year mean and the first 20-year mean results. b The differences in the composites of La Niña episodes between the last 20-year and first 20-year periods.