Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-5087-2009 http://www.atmos-chem-phys-discuss.net/9/5087/2009/ http://www.atmos-chem-phys-discuss.net/9/5087/2009/acpd-9-5087-2009.html http://www.atmos-chem-phys-discuss.net/9/5087/2009/acpd-9-5087-2009.pdf 5087 5118 2009-02-25 Observational study of aerosol hygroscopic growth factors over rural area near Beijing mega-city X. L. Pan P. Yan J. Tang tangj@cams.cma.gov.cn J. Z. Ma Z. F. Wang A. Gbaguidi Chinese Academy of Meteorological Science, China Meteorological Administration, Beijing, China Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China Graduate University of Chinese Academy of Sciences, Beijing, China We investigated aerosol hygroscopic growth property and its influence on scattering coefficient using M9003 nephelometers in coupling with a relative humidity controlled inlet system at a rural site near Beijing mega-city (Jingjintang) from 24th April to15th May 2006. Inlet relative humidity was controlled in an increasing range of 40%–90% while the aerosol hygroscopic growth factor, <i>f</i>(RH=80%), varied in a range of 1.07–2.35 during the measurement. Estimated periodic mean values of aerosol hygroscopic growth factors are 1.27–1.34, 1.17–1.23, 1.55–1.59 and 2.33–2.48 for clean, dust, urban pollution and mixed pollution periods respectively. 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