A Closure Study of Aerosol Hygroscopic Growth Factor during the 2006 Pearl River Delta Campaign |
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| Authors: | LIU Xingang ZHANG Yuanhang WEN Mengting WANG Jingli Jinsang JUNG CHANG Shih-yu HU Min ZENG Limin and Young Joon KIM |
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| Institution: | 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 |
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| 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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| Keywords: | atmospheric aerosol hygroscopic growth factor closure experiment Pearl River Delta campaign |
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