Abstract
Abstract. To better understand the origins and seasonality of atmospheric
aerosols in North China, we collected fine aerosols (PM2.5) at
an urban site (Nankai District, ND) and a suburban site (Haihe Education Park, HEP) in Tianjin from July 2018 to July 2019. The PM2.5 was studied for carbonaceous, nitrogenous and ionic components and stable carbon and
nitrogen isotope ratios of total carbon (δ13CTC) and
nitrogen (δ15NTN). On average, the mass concentrations of
PM2.5, organic carbon (OC), elemental carbon (EC) and water-soluble OC
(WSOC) were higher in winter than in summer at both ND and HEP.
SO42-, NO3- and NH4+ were the dominant ions, and their sum accounted for 89 % of the total ionic mass at ND and 87 % at HEP. NO3- and NH4+ peaked in winter and were at their minimum in summer, whereas SO42- was higher in summer than in all the other seasons at HEP and was comparable among the seasons, although it peaked in winter at ND. δ13CTC and δ15NTN were −26.5 ‰ to −21.9 ‰ and +1.01 ‰ to +22.8 ‰ at ND and
−25.5 ‰ to −22.8 ‰ and
+4.91 ‰ to +18.6 ‰ at HEP. Based on seasonal
variations in the measured parameters, we found that coal and biomass
combustion emissions are the dominant sources of PM2.5 in autumn and winter, while terrestrial and/or marine biological emissions are important
in spring and summer in the Tianjin region, North China. In addition, our
results implied that the secondary formation pathways of secondary organic
aerosols in autumn/winter were different from those in spring/summer; i.e., they might be driven by NO3 radicals in the former period.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Cited by
6 articles.
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