Abstract
Few studies have investigated the spatial patterns of the air temperature urban heat island (AUHI) and its controlling factors. In this study, the data generated by an urban climate model were used to investigate the spatial variations of the AUHI across China and the underlying climate and ecological drivers. A total of 355 urban clusters were used. We performed an attribution analysis of the AUHI to elucidate the mechanisms underlying its formation. The results show that the midday AUHI is negatively correlated with climate wetness (humid: 0.34 K; semi-humid: 0.50 K; semi-arid: 0.73 K). The annual mean midnight AUHI does not show discernible spatial patterns, but is generally stronger than the midday AUHI. The urban–rural difference in convection efficiency is the largest contributor to the midday AUHI in the humid (0.32 ± 0.09 K) and the semi-arid (0.36 ± 0.11 K) climate zones. The release of anthropogenic heat from urban land is the dominant contributor to the midnight AUHI in all three climate zones. The rural vegetation density is the most important driver of the daytime and nighttime AUHI spatial variations. A spatial covariance analysis revealed that this vegetation influence is manifested mainly through its regulation of heat storage in rural land.
摘 要
与地表温度城市热岛相比,当前对气温城市热岛(Air temperature urban heat island, AUHI)的空间变化特征及其影响机制的认知还较为薄弱。本研究基于耦合陆面过程模型CLM5的地球系统模式CESM2模拟的SSP585情景下的气候数据,以中国355个城市为研究对象,对比相同格点内城市次网格与郊区次网格的数据,分析了中国AUHI的空间变化特征,利用发展的AUHI归因分析方法量化了生物物理因子对AUHI的贡献,揭示了气候因子和生态因子对AUHI空间格局的影响机制。结果表明,白天AUHI随着干燥度增加而增强,AUHI在半干旱区最强(0.73±0.13 K),半湿润区次之(0.50±0.14 K),湿润区最弱(0.34±0.14);夜间AUHI虽然强于白天结果,但无明显的空间变化特征。城郊对流效率差异是湿润区(0.32±0.09 K)和半干旱区(0.36±0.11 K)白天AUHI最主要的生物物理贡献因子,城市人为热释放对三个气候区夜间AUHI的贡献最大。郊区叶面积指数是AUHI空间格局的主控因子,它主要通过调节郊区下垫面热量的存储和释放来影响AUHI的空间格局。
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Acknowledgements
This research was supported by the National Key R&D Program of China (Grant No. 2019YFA0607202), the National Natural Science Foundation of China (Grant Nos. 42021004 and 42005143). Heng LYU acknowledges support by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX21_0978). Wei WANG acknowledges support by the Open Research Fund Program of the Key Laboratory of Urban Meteorology, China Meteorological Administration (Grant No. LUM-2023-12), and the 333 Project of Jiangsu Province (Grant No. BRA2022023). We thank Long LI, Yan LIU, Decheng ZHOU, Yifan FAN and Shijia PENG for providing the data for Fig. 3.
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• The annual mean midday AUHI is negatively correlated with the precipitation gradient across China.
• The urban–rural difference in convection efficiency is the largest contributor to the midday AUHI in humid and semi-arid climate zones.
• The rural LAI is the most important driver of the AUHI spatial variations, mainly via its regulation of heat storage in rural land.
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Lyu, H., Wang, W., Zhang, K. et al. Factors Influencing the Spatial Variability of Air Temperature Urban Heat Island Intensity in Chinese Cities. Adv. Atmos. Sci. 41, 817–829 (2024). https://doi.org/10.1007/s00376-023-3012-y
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DOI: https://doi.org/10.1007/s00376-023-3012-y