京津冀地区AOD和PM_(2.5)质量浓度的特征及相关性分析

Analysis of characteristic and correlation of mass concentration of aerosol optical depth retrievals and ground-level PM_(2.5) in the Beijing-Tianjin-Hebei Region,China

为了探讨京津冀地区AOD和PM_(2.5)的变化特征及其相关性对NASA MODIS气溶胶光学厚度产品与京津冀地区PM_(2.5)质量浓度进行了比较分析。结果表明,AOD和PM_(2.5)均有明显的时间和空间分布特征且二者变化特征一致:张家口、承德、秦皇岛是观测期间2014年11月—2015年3月污染最轻的3个城市;京津冀南部AOD值和PM_(2.5)质量浓度明显高于北部。通过各市AOD和PM_(2.5)质量浓度的相关性分析,其最优模型均是非线性模型。根据各市最优模型得到的决定系数,邢台市、衡水市和石家庄市AOD和PM_(2.5)质量浓度具有比较好的相关性,北京市和天津市的相关性相对较差。

Aerosol optical depth （AOD） datasets are used to describe and analyze air pollution. The asso- ciation between satellite based AOD and air pollution monitored on the ground can be influenced by a number of factors. The relation between moderate resolution imaging speetroradiometer （MODIS） AOD and PM2.5 in the Beijing-Tianjin-Hebei region was analyzed. The results showed a consistent spatial-temporal distribution of AOD and PM2.5. During November 2014 to March 2015, air pollution remained at low levels in Zhangjiakou, Cheng- de, and Qinhuangdao. AOD and PM2.5 were higher in the south than in the north of the Beijing-Tianjin-Hebei region. The correlation of AOD and PM2.5showed that the nonlinear model was optimal. According to the coeffi- cients of determination, the correlations between AOD and PM2.swere moderate in Shijiazhuang, Hengshui and Xingtai, but weak in Beijing and Tianjin.