Abstract: This study was based on two-year MODIS aerosol optical depth (AOD) product and PM₁₀ mass concentrations calculated from Air Pollutant Index (API) in Beijing and the hourly averaged measurements at Peking University in Beijing and Yuen Long station in Hong Kong. The direct correlation between AOD and PM₁₀ mass concentration was found relatively low. The correlation coefficient between aerosol surface extinction ( achieved from dividing AOD by seasonal aerosol scalar heights) and PM₁₀ mass concentration increased to some extent. The correlation further improved after considering the influence of relative hfumidity (RH) on aerosol optical properties. This comparison verified that the MODIS AOD can be applied in the evaluation of surface PM₁₀ mass concentration after taking aerosol vertical distribution and influence of RH into consideration.

Key words: MODIS, AOD, PM₁₀

摘要： 利用MODIS(中分辨率成像光谱仪) 两年的气溶胶光学厚度(AOD)产品与北京地区API转化得到的PM₁₀ 质量浓度、北京大学站点直接监测的PM₁₀ 质量浓度以及香港元朗站点监测的PM₁₀ 质量浓度做相关性分析, 发现二者的直接相关程度较低。将AOD除以气溶胶季节标高, 得到地面消光系数, 与地面 PM₁₀ 质量浓度相关性提高。对地面消光系数进行相对湿度订正, 得到计算的质量浓度, 与地面实际观测的PM₁₀ 质量浓度相关性进一步提高。经过两年时间资料的对比分析, 证实气溶胶遥感光学厚度经过垂直和湿度影响订正后, 可以应用于地面 PM₁₀ 监测。

关键词: MODIS, 气溶胶光学厚度, PM10