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Observational study of influence of aerosol hygroscopic growth on scattering coefficient over rural area near Beijing mega-city

by X. L. Pan, P. Yan, J. Tang, J. Z. Ma, Z. F. Wang, A. Gbaguidi, Y. L. Sun
Atmospheric Chemistry and Physics ()

Abstract

We investigated aerosol hygroscopic growth property and its influence on\nscattering coefficient using M9003 nephelometers in coupling with\nhumidity controlled inlet system at a rural site near Beijing mega-city\nfrom 24 April to 15 May 2006. Inlet relative humidity was controlled in\nan increasing range of 40%-90% while aerosol hygroscopic growth factor\nof scattering coefficient, f (RH=80%) as ratio of scattering\ncoefficient at RH=80% to ``dry{''} scattering coefficient (RH<40%)\nvaried in a range of 1.07-2.35 during the measurement. Further analysis\nindicated that under dust episode, measured f (RH=80%) is 1.2 +/- 0.02,\nand estimated periodic mean value of f (RH=80%) was 1.31 +/- 0.03 under\nclean periods; during urban pollution periods, the aerosol displayed\nrelative strong water absorbing properties with f (RH=80%) of about\n1.57 +/- 0.02. An examination of chemical composition of daily filter\nsamples highlighted that aerosol hygroscopicity was generally depressed\nwith the increasing ratio of organic matter (OMC)/ammonium sulfate (AS)\nin particle mass, similar with the results of many previous studies.\nHowever, a special case with high value of f (RH=80%)=2.21 and high\nOMC/AS ratio was also observed, this exception reflected\nphysico-chemical particularities of organic matter and its complex\ninteraction with other compounds during this episode.

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