福州城市上空气溶胶遥感应用的环境效应研究

【作者】 潘卫华；

【机构】 福建省气象科学研究所；

【摘要】 大气气溶胶光学厚度是影响空气质量的重要因素之一,利用遥感技术暗像元反演方法,进行了波段敏感性试验,建立了采用MODIS影像对福州城市上空的气溶胶光学厚度进行遥感反演模式。结果表明福州城市上空气溶胶光学厚度高值区集中在市中心商业区和郊区的工业带区,低值区主要分布为较高海拔且高植被的山区,福州的地形不利于气溶胶颗粒的输出和转移。更多还原

【Abstract】 Aerosol optical depth(AOD) was an important factor in the aerosol research, a test of sensitivity to AOD and the surface reflectance were made for the planetary albedo of three channels of MODIS( red, blue and mid-infrared band) by 6S( second simulation of satellite signal in the solar spectrum) models. Considering the importance to select appropriate parameters of 6S model in atmospheric correction, aerosol modes such as urban aerosol model was applied respectively to the sensitivity examinations based on MODIS data of October 12 th, 2014 for Fuzhou city, which lied in Southeast of China. Based on the the Dense Dark Vegetation algorithms(DDV) advocated by Kaufman, it must be possessed with two basic rules that correlation of the AOD and planetary albedo of red band and blue band were sensitive, on the opposite, the AOD of mid-infrared band was no significant change with the planetary albedo of mid-infrared band. The AOD images of red, blue and mid-infrared bands were retrieved by DDV based on the MODIS data, moreover, the 550 nm AOD image and its isoline were made to analyze the characters of AOD in Fuzhou city. The results showed that the there were tow maximums in outline of AOD, one lied in Fuzhou metropolitan area, where was the commercial trade centre in Fuzhou. The other lied in Mawei development area where some factories and shipbuilding mills were in existence. However, the minimum of AOD mainly lied in high mountains such as Gushan and Qishan mountains, where owned dense vegetation and forest. In conclusion, the AOD layouts retrieved from MODIS data were agreed with the distribution of urban surface types in Fuzhou, and the export and transfer of aerosol grains was slow because of landform.更多还原