Stable carbon isotope characterization and the source of total carbon in Guangzhou PM2.5
Carbonaceous aerosols have an important impact on climate and environment and are the major component of atmospheric PM2.5.In this study,a total of 123 PM2.5 samples were collected in Guangzhou in the fall(September-October)and winter(December-January)of 2017-2018,and the concentration of total carbon(TC)and the stable carbon isotopecomposition(δ13C)of PM2.5 samples were measured.Based on that theδ13C values of different carbon sources are different,the carbon source of aerosols in Guangzhou were identified using sample δ13C results combined with Bayesian model,backward trajectory,clustering analysis and other methods.The results showed that both TC concentration and δ13C value of aerosols in Guangzhou exhibited a trend of low in fall and high in winter.The calculation of the Bayesian model suggested that the main carbon sources of aerosols were motor vehicle exhaust and biomass,with contributions of 52.40%and 36.30%in fall and 62.30%and 18.10%in winter,respectively.That is,the contribution of biomass combustion was approximately one times higher in fall than in winter.
NETL
NSTL
万方数据
