Application of retrieved high-resolution AOD in regional PM monitoring in the Pearl River Delta and Hong Kong region
高分辨率气溶胶光学厚度在珠三角及香港地区区域颗粒物监测中的应用研究

Based on the newest aerosol retrieval algorithm for the Moderate Resolution Imaging Spectroradiometer (MODIS), 1 km×1 km aerosol optical depth (AOD) data over the Pearl River Delta region and Hong Kong was retrieved, and validated with the AERONET observations (r=0.917). Correlations between the retrieved AOD data and observed PM10 concentrations in 2008 at 5 monitoring stations in the Pearl River Delta region and Hong Kong were analyzed. The results indicated that initial correlations between AOD and PM10 concentrations are relatively low(r=0.127~0.230); however, the correlations were greatly improved after the vertical correction of seasonal aerosol scalar heights and the relative humidity (RH) correction on aerosol optical properties (r=0.397~0.574). A linear regression model of the observed PM10 concentrations vs AOD data was developed with the use of aerosol extinction coefficients to retrieve the surface PM10 concentration distributions. Our results suggest that the high-resolution AOD data can help analyze regional air pollution characteristics and provide an alternative approach for assessing regional air quality.