利用TM影像反演广州市气溶胶光学厚度空间分布

利用2005年7月18日摄录的广州市TM影像,在相关研究基础上建立了适合于复杂大气状况城市尺度的气溶胶光学厚度(Aerosol Optical Depth,AOD)反演模型,研究了广州市30m空间分辨率的AOD空同分布,并与同期的广州市地面9个空气质量监测站的PM10浓度进行比较.结果表明,利用TM影像较好地反演了广州市AOD空间分布.地形、植被、建成区分布是影响广州市AOD空间分布的主要因素,AOD按照高山植被区、靠近建成区的山地植被区、建成区与平原植被区的顺序逐渐增加.地面监测的PM10浓度与AOD的相关系数为0.717,基于TM影像反演的AOD可较好地反映当日地面污染物PM10的空间分布.

The distribution of aerosol optical depth retrieved by TM imagery over Guangzhou,China

The distribution of aerosol optical depth (AOD) is studied on an urban-scale. The AOD data is obtained from 30 m resolution Landsat Thematic Mapper (TM) imagerys. This method is suitable for city imagery under a variety of atmospheric and surface conditions. It was used to obtain the 30 m resolution AOD distribution over Guangzhou on July 18,2005. The AOD absolute values were compared with the concentrations of PM₁₀ obtained at 9 stations in Guangzhou. The results show that the AOD distribution over Guangzhou could be retrieved by this method. The distribution of AOD was greatly influenced by the terrain,vegetation and buildings. The AOD increased gradually from areas of high mountain vegetation to suburban mountain vegetation to developed areas and vegetated plains. The correlation coefficient was 0.717 between the AOD and PM₁₀. The urban-scale PM₁₀ distribution matches the AOD distribution retrieved by TM imagery quite well.