The surface urban heat island (SUHI) effect poses severe challenges to urban sustainable development and urban livability. Current studies lack the analysis of heat island effect from the perspective of new and old furnace cities. In this study, spatiotemporal characteristics and influencing mechanisms of heat islands were investigated in eight furnace cities in middle and lower reaches of Yangtze River from 2010 to 2020. DBSCAN was proven effective in exploring the number and location of heat island cores. Besides, MGWR model was utilized to analyze the spatial heterogeneity of dominant factors. The results indicate that: (1) The area of heat islands showed an increasing trend. The increase rate in new furnace cities was faster than that in the old. (2) The heat island patches had gradually gathered. The heat island cores of eight furnace cities showed three types of growing, stabilizing, and decreasing. (3) The expansion type of heat islands was mainly edge expansion. The transformation of farmland into built-up land made the most significant contribution. (4) Impervious surface area, gross domestic product, and population density were the top three factors intensifying the SUHI effect. The results can provide a scientific basis for formulating reasonable urban heat island mitigation strategies.

中文翻译：

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长江中下游8个炉城SUHI演化特征及影响机制


地表城市热岛效应 （SUHI） 对城市可持续发展和城市宜居性构成了严峻挑战。目前的研究缺乏从新老炉城角度对热岛效应的分析。本研究以 2010—2020 年长江中下游 8 个炉城为研究对象，研究了热岛的时空特征及其影响机制。DBSCAN 被证明可以有效地探索热岛核心的数量和位置。此外，利用 MGWR 模型分析优势因素的空间异质性。结果表明：（1）热岛面积呈增加趋势。新建炉城的增长率比旧炉市快。（2） 热岛斑块逐渐聚集。8 个炉城的热岛核心呈现增长、稳定和减少三种类型。（3）热岛的膨胀类型以边缘膨胀为主。农田转变为建设用地做出了最重要的贡献。（4） 不透水表面积、国内生产总值和人口密度是强化 SUHI 效应的前 3 个因素。研究结果可为制定合理的城市热岛缓解策略提供科学依据。