| 摘 要： |
Heatwaves (HW) present a significant threat to human health, making it essential to understand HW trends in China and the interaction between urbanization and HW is crucial for effective climate change adaptation. This study aims to quantify the differences in the contribution and impact of urbanization on urban warming during HW and non-heatwave (NHW) periods in China. By utilizing remote sensing impervious surface data, 2, 421 meteorological stations were dynamically classified into urban and rural stations from 1978 to 2017. The study identified concurrent heatwave (CHW) and NHW periods in both urban and rural areas, exploring the differences in urbanization effect between these periods. The results revealed that most regions in China were experiencing increasingly frequent and severe HW, with the number of HW events and total HW days rising by 0.3 events and 2.2 days per decade, respectively. During CHW periods, the average temperature difference between urban and rural areas increased by 0.33 degree celsius, while the effect of urbanization on urban warming rose by 0.21 degree celsius per decade, compared to NHW period. This indicates a synergistic enhancement of population exposure risk due to HW and urbanization. Over 60% of cities experienced a steeper linear trend in urban temperatures compared to rural areas during CHW, alongside reduced wind speeds and decreased precipitation. Implementing targeted adaptation and mitigation strategies is crucial to mitigating the increased risk of population exposure during HW events. |
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