南京市热岛效应时空特征的遥感分析

城市热岛效应是城市化对城市气候影响最典型的表现, 不同城市由于其城市化水平、城市性质、规模以及自然条件的不同而具有不同的时空特征。利用高空间分辨率的Landsat TM 和高时间分辨率的MODIS 相结合定量地分析了南京市热岛效应的时空特征, 并探讨了遥感尺度对城市热岛效应时空特征的影响。结果表明: 南京市热岛效应日特征为白天大于夜晚; 季节特征从热岛强度和热岛范围两方面来说明, 热岛强度: 秋季> 夏季> 春季> 冬季, 分布范围: 夏季> 秋季> 春季> 冬季; 空间上存在3 个分布广且连续的强热岛区, 最大的热岛呈组团状分布、第二的呈线状分布、第三的热岛呈带状分布; 不同遥感尺度下观测到的城市热岛效应强度和范围不同。

Time-Space Character Analysis of Urban Heat Island Effect in Nanjing City Using Remote Sensing

Urban heat island effect is the typical representation of urbanization impacts on urban climate.The urban heat island has different time and spatial characteristics for a different urban because of different urbanization level,essence,size and nature condition.The paper analyzes the time and space characteristics of Nanjing city combing high space-resolution Landsat TM with high time-resolution MODIS.This paper analyzes daily characteristics of UCL heat island by eight granule MODIS,seasonal characteristics by sixteen granule MODIS and probes the scale effect of UCL heat island.The diurnal urban heat island intensity is stronger than overnight's.The strongest intensity of urban heat island happens on autumn,the second on summer,the third on spring,the last on winter.The most extensive in scope occurs in summer,the second in autumn,the third in spring, the last in winter.There are three continuous and extensive heat islands in Naning city.The largest area heat island takes on clustere shape,distributing both the riversides of Qinhuai River.The second is the lineal shape along Rehe Road,Jiangnin Road,Longpan Road,Hongshan Road and Heyan Road.The third presents zonal shape and distributes the industry land use in Dachang district and Pukou district.The intensity and scope of urban heat island results are different with different remote scale.The intensity and scope of urban heat island in Naning city respectively using TM and MODIS on April 17,2000 and the scope and intensity using TM are all lager than that using MODIS.