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Open AccessArticle

Significant Contribution of Primary Sources to Water-Soluble Organic Carbon During Spring in Beijing, China

1
SKL-ESPC and BIC-ESAT, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
2
Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA
3
State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(4), 395; https://doi.org/10.3390/atmos11040395
Received: 18 February 2020 / Revised: 26 March 2020 / Accepted: 2 April 2020 / Published: 16 April 2020
(This article belongs to the Special Issue Chemical Analysis Methods for Particle-Phase Pollutants)
Despite the significant role water-soluble organic carbon (WSOC) plays in climate and human health, sources and formation mechanisms of atmospheric WSOC are still unclear; especially in some heavily polluted areas. In this study, near real-time WSOC measurement was conducted in Beijing for the first time with a particle-into-liquid-sampler coupled to a total organic carbon analyzer during the springtime, together with collocated online measurements of other chemical components in fine particulate matter with a 1 h time resolution, including elemental carbon (EC), organic carbon (OC), multiple metals, and water-soluble ions. Good correlations of WSOC with primary OC, as well as carbon monoxide, indicated that major sources of WSOC were primary instead of secondary during the study period. The positive matrix factorization model-based source apportionment results quantified that 68 ± 19% of WSOC could be attributed to primary sources, with predominant contributions by biomass burning during the study period. This finding was further confirmed by the estimate with the modified EC-tracer method, suggesting significant contribution of primary sources to WSOC. However, the relative contribution of secondary source to WSOC increased during haze episodes. The WSOC/OC ratio exhibited similar diurnal distributions with O3 and correlated well with secondary WSOC, suggesting that the WSOC/OC ratio might act as an indicator of secondary formation when WSOC was dominated by primary sources. This study provided evidence that primary sources could be major sources of WSOC in some polluted megacities, such as Beijing. From this study, it can be seen that WSOC cannot be simply used as a surrogate of secondary organic aerosol, and its major sources could vary by season and location. View Full-Text
Keywords: WSOC; source apportionment; diurnal variation; primary source; secondary formation WSOC; source apportionment; diurnal variation; primary source; secondary formation
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Jin, Y.; Yan, C.; Sullivan, A.P.; Liu, Y.; Wang, X.; Dong, H.; Chen, S.; Zeng, L.; Collett, Jr., J.L.; Zheng, M. Significant Contribution of Primary Sources to Water-Soluble Organic Carbon During Spring in Beijing, China. Atmosphere 2020, 11, 395.

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