不同算法下超大城市中心城区夏季冠层热岛强度的时空分异特征  

Characteristics of spatial and temporal differentiation of summer canopy heat island intensity in central urban areas of megacities under different algorithms

作　　者：刘火胜 李思韬[2] 吴昌广[2] 张璟妍 LIU Huosheng;LI Sitao;WU Changguang;ZHANG Jingyan(Wuhan Public Meteorological Service Center,Wuhan 430040,China;College of Horticulture&Forestry Sciences,Huazhong Agricultural University,Wuhan 430070,China)

机构地区：[1]武汉市公共气象服务中心,武汉430040 [2]华中农业大学园艺林学学院,武汉430070

出　　处：《华中农业大学学报》2024年第5期132-139,共8页Journal of Huazhong Agricultural University

基　　金：湖北省气象局科技发展基金项目(2021Y12);武汉市园林和林业局科技基金项目(WHGF2022A05);中央高校基本科研业务费专项(2662022YLYJ002)。

摘　　要：为准确评估高度复杂的超大型城市冠层热岛强度分异特征,以武汉市为例,提出一种考虑城市不同片区空间差异性的冠层城市热岛强度(canopyurbanheatislandintensity,CUHII)计算方法,并结合基于“城-郊”二分法的传统算法探讨不同算法下冠层城市热岛特征。结果显示:传统算法下各片区始终表现出城市热岛现象,且CUHII日变化曲线高度一致;与之相反,片区算法中各片区的CUHII日变化差异显著,具有多个大型生态空间的武昌片区在昼间出现了持续的冷岛现象。同时,除晴朗天气外,高温和降水天气会进一步加剧片区算法中城市片区间CUHII差异。此外,传统算法识别的冷、热岛中心范围较小并分布于中心城区外围,而片区算法识别的热岛中心呈带状覆盖城区中部高密集开发区,冷岛中心则邻近武昌片区内大型自然湖泊。结果表明,提出的算法弱化了城市区域发展不均对冠层热岛评估带来的干扰,有利于深入挖掘热岛特征并更加准确地识别城市热环境需要优先干预的区域。Wuhan City was used to accurately evaluate the differentiation characteristics of canopy heat island intensity in highly complex megacity.A calculation method for canopy urban heat island intensi⁃ty(CUHII)considering spatial differences in different urban areas was proposed.The characteristics of ur⁃ban heat islands under different algorithms were studied with combining traditional algorithms based on the“urban suburban”dichotomy.Results showed that each area consistently exhibited urban heat island phe⁃nomenon under traditional algorithms,and the daily variation curve of CUHII was highly consistent.On the contrary,there was a significant difference in the daily variation of CUHII among different areas in the regional algorithm,and the Wuchang district with multiple large ecological spaces exhibited a sustained cold island phenomenon during the daytime.In addition,traditional algorithms identified cold and heat is⁃land centers that are relatively small and distributed around the periphery of the central urban area,while re⁃gional algorithms identified heat island centers that cover high-density development areas in the middle of the urban area in a belt shape,and the cold island centers are adjacent to large natural lakes in the Wuchang district.It is indicated that the algorithm proposed weakens the interference of uneven development of urban areas on the assessment of canopy heat island,which is conducive to in-depth mining of heat island charac⁃teristics and more accurate identification of areas that need priority intervention in urban thermal environ⁃ment.

关 键 词：城市热岛强度 冠层城市热岛 气象条件 自动气象站 武汉市 

分 类 号：TU119.4[建筑科学—建筑理论]