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A Closure Study of Aerosol Hygroscopic Growth Factor during the 2006 Pearl River Delta Campaign


doi: 10.1007/s00376-009-9150-z

  • Measurements of aerosol physical, chemical and optical parameters were carried out in Guangzhou, China from 1 July to 31 July 2006 during the Pearl River Delta Campaign. The dry aerosol scattering coefficient was measured using an integrating nephelometer and the aerosol scattering coefficient for wet conditions was determined by subtracting the sum of the aerosol absorption coefficient, gas scattering coefficient and gas absorption coefficient from the atmospheric extinction coefficient. Following this, the aerosol hygroscopic growth factor, f(RH), was calculated as the ratio of wet and dry aerosol scattering coefficients. Measurements of size-resolved chemical composition, relative humidity (RH), and published functional relationships between particle chemical composition and water uptake were likewise used to find the aerosol scattering coefficients in wet and dry conditions using Mie theory for internally- or externally-mixed particle species [(NH4)2SO4, NH4NO3, NaCl, POM, EC and residue]. Closure was obtained by comparing the measured f(RH) values from the nephelometer and other in situ optical instruments with those computed from chemical composition and thermodynamics. Results show that the model can represent the observed f(RH) and is appropriate for use as a component in other higher-order models.
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Manuscript History

Manuscript received: 10 July 2010
Manuscript revised: 10 July 2010
通讯作者: 陈斌, bchen63@163.com
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A Closure Study of Aerosol Hygroscopic Growth Factor during the 2006 Pearl River Delta Campaign

  • 1. College of Environmental Sciences and Engineering, Peking University, Beijing 100871,College of Environmental Sciences and Engineering, Peking University, Beijing 100871,College of Environmental Sciences and Engineering, Peking University, Beijing 100871,Institute for Urban Meteorology, China Meteorological Administration, Beijing 100081,Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea,Research Center for Environmental Changes, Academia Sinica, Taiwan,College of Environmental Sciences and Engineering, Peking University, Beijing 100871,College of Environmental Sciences and Engineering, Peking University, Beijing 100871,Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea

Abstract: Measurements of aerosol physical, chemical and optical parameters were carried out in Guangzhou, China from 1 July to 31 July 2006 during the Pearl River Delta Campaign. The dry aerosol scattering coefficient was measured using an integrating nephelometer and the aerosol scattering coefficient for wet conditions was determined by subtracting the sum of the aerosol absorption coefficient, gas scattering coefficient and gas absorption coefficient from the atmospheric extinction coefficient. Following this, the aerosol hygroscopic growth factor, f(RH), was calculated as the ratio of wet and dry aerosol scattering coefficients. Measurements of size-resolved chemical composition, relative humidity (RH), and published functional relationships between particle chemical composition and water uptake were likewise used to find the aerosol scattering coefficients in wet and dry conditions using Mie theory for internally- or externally-mixed particle species [(NH4)2SO4, NH4NO3, NaCl, POM, EC and residue]. Closure was obtained by comparing the measured f(RH) values from the nephelometer and other in situ optical instruments with those computed from chemical composition and thermodynamics. Results show that the model can represent the observed f(RH) and is appropriate for use as a component in other higher-order models.

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