TY - JOUR
T1 - An alternative method for estimating hygroscopic growth factor of aerosol light-scattering coefficient
T2 - A case study in an urban area of Guangzhou, South China
AU - Lin, Z. J.
AU - Zhang, Z. S.
AU - Zhang, L.
AU - Tao, J.
AU - Zhang, R. J.
AU - Cao, J. J.
AU - Fan, S. J.
AU - Zhang, Y. H.
PY - 2014/7/30
Y1 - 2014/7/30
N2 - A method was developed to estimate hygroscopic growth factor (f(RH)) of aerosol light-scattering coefficient (bsp), making use of the measured size- and chemically resolved aerosol samples. In this method, chemical composition of the measured aerosol samples were first reconstructed using the equilibrium model ISORROPIA II. The reconstructed chemical composition, which varies with relative humidity (RH), was then employed to calculate b sp and hygroscopic growth factor of bsp (f sp(RH)) using the Mie model. Furthermore, the calculated f sp(RH) was fitted with an empirical curve. To evaluate the applicability of fsp(RH), the curve of fsp(RH) was used to correct the long-term records of the measured bsp from the values under comparative dry conditions to the ones under ambient RH conditions. Compared with the original bsp data, the fsp(RH)-corrected bsp had a higher linear correlation with, and a smaller discrepancy from, the bsp derived directly from visibility and absorption measurements. The fsp(RH) determined here was further compared with that reported in previous studies. The method described in this manuscript provides an alternative approach to derive credible fsp(RH) with high accuracy and has many potential applications in aerosol-related research.
AB - A method was developed to estimate hygroscopic growth factor (f(RH)) of aerosol light-scattering coefficient (bsp), making use of the measured size- and chemically resolved aerosol samples. In this method, chemical composition of the measured aerosol samples were first reconstructed using the equilibrium model ISORROPIA II. The reconstructed chemical composition, which varies with relative humidity (RH), was then employed to calculate b sp and hygroscopic growth factor of bsp (f sp(RH)) using the Mie model. Furthermore, the calculated f sp(RH) was fitted with an empirical curve. To evaluate the applicability of fsp(RH), the curve of fsp(RH) was used to correct the long-term records of the measured bsp from the values under comparative dry conditions to the ones under ambient RH conditions. Compared with the original bsp data, the fsp(RH)-corrected bsp had a higher linear correlation with, and a smaller discrepancy from, the bsp derived directly from visibility and absorption measurements. The fsp(RH) determined here was further compared with that reported in previous studies. The method described in this manuscript provides an alternative approach to derive credible fsp(RH) with high accuracy and has many potential applications in aerosol-related research.
UR - https://www.scopus.com/pages/publications/84905196734
U2 - 10.5194/acp-14-7631-2014
DO - 10.5194/acp-14-7631-2014
M3 - 文章
AN - SCOPUS:84905196734
SN - 1680-7316
VL - 14
SP - 7631
EP - 7644
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
IS - 14
ER -