Three-years monitoring of PM2.5 and scattering coefficients in Shanghai, China.

Three-years monitoring of PM2.5 and scattering coefficients in Shanghai, China. Chemosphere. 2020 Aug;253:126613 Authors: Zhang L, Qiao L, Lan J, Yan Y, Wang L Abstract The absorption and scattering of aerosols are critical factors that influence in global climate and visibility degradation. From January 2013 to December 2015, aerosol scattering coefficients, PM2.5, and meteorological parameters were continuously measured at a monitoring site in Shanghai, China. The annual means of scattering coefficients were 312.3, 232.1, and 261.9 Mm-1 for the years 2013, 2014, and 2015, respectively. The corresponding values for PM2.5 were 61.6, 51.6, and 52.9 μg/m3. Compared with the average scattering coefficient of the year 2013, those of 2014 and 2015decreased by 26% and 16%, respectively. Furthermore, the annual average PM2.5 decreased by 16% and 14% in 2014 and 2015, respectively. Although this study concluded that PM2.5 was generally correlated with scattering coefficients during the entire measurement period, the decrease in the former was much less than the latter. On this basis, ultrafine particles may decrease significantly because they cause aerosol scattering. This finding should be investigated further in the future. The inter-annual meteorological changes affected PM2.5 and scattering coefficient inter-annual variations. In the northwest and southwest direction, the seasonal and diurnal variations of aerosol scattering coefficie...
Source: Chemosphere - Category: Chemistry Authors: Tags: Chemosphere Source Type: research