Attributes analysis of global urban anthropogenic heat index with multi-sources remote sensing data

Urban anthropogenic heat has a direct impact on urban climate. However, due to a warm feedback loop, the attributions of urban anthropogenic heat in urban area are unclear. This research carried out an attribution analysis of anthropogenic heat index (AHI) derived from remote sensing over global 1386 cities to investigate the contribution of 13 environmental variables to global urban anthropogenic heat based on GEE environment. 13 independent variables are categorized the groups of human activities, land morphology, vegetation, climate and atmospheric environment on anthropogenic heat. The results show that although human activities are considered as the main source of the anthropogenic heat, other factors have more impacts on the anthropogenic heat pattern in the urban area due to the feedback loop of urban thermal environment. Climate played a leading role in the impacts on anthropogenic heat with a contribution rate of 30-50% in most background contexts. The impact rate of human activities and landforms on anthropogenic heat accounts for 20% in most background scenarios. The findings of this research can contribute to the solution of mitigating urban anthropogenic heat and expanded the research scope of urban anthropogenic heat in the urban area.