TY - JOUR
T1 - Aircraft measurement of organic aerosols over China
AU - Wang, Gehui
AU - Kawamura, Kimitaka
AU - Hatakeyama, Shiro
AU - Takami, Akinori
AU - Li, Hong
AU - Wang, Wei
PY - 2007/5/1
Y1 - 2007/5/1
N2 - Lower to middle (0.5-3.0 km altitude) tropospheric aerosols (PM 2.5)collected by aircraft over inland and east coastal China were, for the first time, characterized for organic molecular compositions to understand anthropogenic, natural, and photochemical contribution to the air quality. n-Alkanes, fatty acids, sugars, polyacids are detected as major compound classes, whereas lignin and resin products, sterols, polycyclic aromatic hydrocarbons, and phthalic acids are minor species. Average concentrations of all the identified compounds excluding malic acid correspond to 40-50% of those reported on the ground sites. Relative abundances of secondary organic aerosol (SOA) components such as malic acid are much higher in the aircraft samples, suggesting an enhanced photochemical production over China. Organic carbon (OC) concentrations in summer (average, 24.3 μg m -3) were equivalent to those reported on the ground sites. Higher OC/EC (elemental carbon) ratios in the summer aircraft samples also support a significant production of SOA over China. High loadings of organic aerosols in the Chinese troposphere may be responsible to an intercontinental transport of the pollutants and potential impact on the regional and global climate changes.
AB - Lower to middle (0.5-3.0 km altitude) tropospheric aerosols (PM 2.5)collected by aircraft over inland and east coastal China were, for the first time, characterized for organic molecular compositions to understand anthropogenic, natural, and photochemical contribution to the air quality. n-Alkanes, fatty acids, sugars, polyacids are detected as major compound classes, whereas lignin and resin products, sterols, polycyclic aromatic hydrocarbons, and phthalic acids are minor species. Average concentrations of all the identified compounds excluding malic acid correspond to 40-50% of those reported on the ground sites. Relative abundances of secondary organic aerosol (SOA) components such as malic acid are much higher in the aircraft samples, suggesting an enhanced photochemical production over China. Organic carbon (OC) concentrations in summer (average, 24.3 μg m -3) were equivalent to those reported on the ground sites. Higher OC/EC (elemental carbon) ratios in the summer aircraft samples also support a significant production of SOA over China. High loadings of organic aerosols in the Chinese troposphere may be responsible to an intercontinental transport of the pollutants and potential impact on the regional and global climate changes.
UR - https://www.scopus.com/pages/publications/34248188772
U2 - 10.1021/es062601h
DO - 10.1021/es062601h
M3 - 文章
C2 - 17539513
AN - SCOPUS:34248188772
SN - 0013-936X
VL - 41
SP - 3115
EP - 3120
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 9
ER -
