Characteristics of carbonaceous aerosols and estimation of secondary organic carbon in Chengdu
LI Zhao-yang1, YUAN Liang1,2, ZHANG Xiao-ling1,2, WEI Rong1, LI Shuang-zhi1
1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China; 2. Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu 610225, China
Abstract：To investigate the diurnal and seasonal characteristics of carbonaceous aerosols in Chengdu, mass concentrations of total carbon (TC), organic carbon (OC), elemental carbon (EC), and secondary organic carbon (SOC) were continuous hourly measured from June 2020 to May 2021. The results showed that the annual mean values of m(TC), m(OC) and m(EC) during the observation periods were (9.5±4.4) μg/m3, (6.4±3.2) μg/m3 and (3.2±1.1) μg/m3, respectively, with the ratio of r(OC/EC) at 2.2±0.5. The m(TC), m(OC) and m(EC)in Chengdu peaked in winter ((15.8±8.2), (11.1±5.8), (4.6±2.5) μg/m3), followed by spring and autumn, and reached to the lowest level in summer ((6.1±0.9), (4.5±2.0), (2.7±1.4) μg/m3).The seasonal means of r(OC/EC) were in the range of 1.9~2.6, and the diurnal variations in m(TC), m(OC) and m(EC) followed the "bimodal" pattern which peaked in the morning (07:00~09:00) and the evening (22:00~01:00).This indicated significant contributions of motor vehicle emissions on carbonaceous aerosols in Chengdu. The correlation between OC and EC wasweaker in spring and summer than in autumn and winter, indicating that the sources of OC and EC were quite different in spring and summer. The m(SOC), which was estimated by the EC-tracer method and the Minimum R-Squared method, and the r(SOC/OC) was the largest in summer (40.4%) and the smallest in winter (27.3%). The significant positive correlation between SOC and O3 in spring and summer revealed that photochemical reactions contributed significantly to the formation of SOC. The continuous high m(TC) periods in each season were selected for comparison with the seasonal averages. The results showed that carbonaceous aerosols had obvious nocturnal accumulation process. The m(OC) increased significantly higher than that of m(EC) due to the secondary production during the high concentration periods in summer, and the r(OC/EC) also increased rapidly during these times.
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