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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 ()
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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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