京津冀地区的大气颗粒物污染非常严重,对气候环境和人类健康产生直接影响。为了使用遥感技术对京津冀地区的颗粒物污染进行快速、准确的评价,验证了NASA近期发布的全球1 km分辨率的MCD19A2气溶胶光学厚度(AOD)产品在京津冀地区的精度,明确了卫星产品在该区域应用的可靠性,并分析了AOD产品与空气质量指数(AQI)的相关性,探讨其对空气污染的指示作用。获取2014~2018年京津冀地区的MCD19A2 AOD空间分布数据,以及同步的AERONET实测数据,对两类数据进行了时空转化等处理,以实现数据间的精确匹配。验证结果表明,MCD19A2产品在该区域达到较高的精度及稳定性,相关系数、均方根误差、平均绝对误差和期望误差范围分别为0.9504、0.1243、0.0863和82.26%。基于不同尺度AOD结果,与AQI数据进行相关性分析,二者具有较高的相关性,表明MCD19A2数据对空气污染状况具有直接的指示作用。该研究可为气溶胶特性研究、空气质量监测等方面的工作提供一定的参考。

The pollution of atmospheric particulate matter in the Beijing-Tianjin-Hebei (BTH) region is very serious, which has an impact on the climate, environment, and human health. To quickly and accurately evaluate particulate pollution in the BTH region using remote sensing technology, this article verifies the accuracy of the global 1 km resolution MCD19A2 aerosol optical depth (AOD) product released by NASA and analyzes its reliability in the BTH region. At the same time, the correlation between the AOD product and the air quality index (AQI) is analyzed to explore the indication function for air pollution. The spatial distribution data of MCD19A2 AOD and the measured data of aerosol robotic network (AERONET) in the BTH region from 2014 to 2018 are obtained for validation, and the two types of data are processed by space-time transformation to achieve accurate matching. Validation results show that MCD19A2 products have achieved higher accuracy and stability in the BTH region. It's correlation coefficient, root mean square error, mean absolute error, and within expected errors are 0.9504, 0.1243, 0.0863, and 82.26%, respectively. Based on AOD results at different scales, correlation analysis performed with AQI data suggests higher correlation, which indicates that the MCD19A2 data has a direct indication of air pollution. This study can provide some references for the research of aerosol characteristics and air quality monitoring.