摘要：Future heat stress under sixfuture global warming (ΔTGW)scenarios(IPCC RCP8.5)in an Asian megacity (Osaka)is estimated using a regional climate model with an urban canopy and air-conditioning (AC). An urban heat‘stress’ island is projected in all six scenarios(ΔTGW = 0.5 to 3.0 °C in 0.5 °C steps). Under ΔTGW = 3.0 °C conditions, people outdoors experience ‘extreme’ heat stress, which could result in dangerously high increases in human body core temperature. AC-inducedfeedback increases heat stress roughly linearly as ΔTGW increases, reaching 0.6 °C(or 12% of the heat stress increase). As this increase is similar to current possible heat island mitigation techniques, thisfeedback needs to be considered in urban climate projections, especially where AC use is large.
