Seasonal variation characteristics of atmospheric aerosol scattering coefficients in Shanghai

doi:10.7523/j.issn.2095-6134.2014.03.008

Abstract

Abstract:

We used a nephelometer to monitor scattering coefficients on the top of a laboratory building in East China University of Science and Engineering from April to December in 2009. PM_2.5 was simultaneously sampled every day to obtain its mass concentrations and its chemical components. We studied characteristics of diurnal variation in scattering coefficients in different seasons, correlations between scattering coefficient and PM_2.5, and power correlation between visibility and chemical components of PM_2.5. Results indicated that scattering coefficients were higher in autumn and winter and lower in summer. The diurnal variation of scattering coefficient indicated two peaks observed at 6:00 and 18:00,respectively. The peak value was higher in autumn and winter but the diurnal variation changed little in summer. The seasonal comparison indicated that scattering coefficients had strong linear correlations with PM_2.5 in all the seasons. It was found that visibility had power function correlations with secondary ions in spring, with EC in summer, and with both organic components and secondary ions in fall. Due to the complexity of components, sources, and formation mechanisms, no obvious correlations between visibility and components were found for winter.

Key words: scattering coefficients, visibility, PM_2.5

CLC Number:

X513

XU Wei, XIU Guangli, TAO Jun, ZHU Mengya, CAI Jing, WANG Lina, ZHANG Renjian. Seasonal variation characteristics of atmospheric aerosol scattering coefficients in Shanghai[J]. Journal of University of Chinese Academy of Sciences, 2014, 31(3): 345-350.

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