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| Characteristics of water-soluble organic carbon (WSOC) in atmospheric particulate matter at northern suburb of Nanjing |
| WU Dan1,2, SHEN Kai-yuan1,2, GE Xin-lei1,2, XIA Jun-rong3, LIU Gang1,2, LI Feng-ying1,2, YANG Meng1,2 |
1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET), Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing 210044, China;
3. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing 210044, China |
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Abstract The atmospheric particles collected during January to November 2014 at a northern suburban site of Nanjing was analyzed and focused on the characterization of water-soluble organic carbon (WSOC) in the samples. The annual mean concentrations of WSOC in PM2.5, PM10 and TSP were determined to be 5.90 ±3.38, 6.93 ±3.79, 7.34 ±3.91μg/m3 respectively, and more than 80% of WSOC was concentrated in PM2.5 samples. The WSOC concentration in PM2.5 was highest in winter following by summer, which was likely related to the strong secondary production during these two seasons; the WSOC concentration was relatively higher in coarse particles during spring, likely due to influences from soil-derived particles; in autumn, the WSOC concentration was the lowest. During spring and autumn, it was also found that the PM2.5 WSOC concentration was higher during nighttime, probably owing to the atmospheric conditions during nighttime unfavorable for pollutant dispersion; on the other hand, the concentration was higher during daytime in winter and summer, suggesting the stronger photochemical production of WSOC during these two seasons. The scavenging effect due to precipitation influenced the WSOC concentrations in particles across all size ranges, but was most efficient for PM2.5, which can reach an maximum of 54.9% during summer. The PM2.5 WSOC concentration also increased significantly with the increase of pollution level, on average nearly 4times from 3.84μg/m3 in non-hazy days to 11.23μg/m3 in heavily polluted days; the mass fraction of WSOC in fine mode particles increased in hazy days as well, suggesting that stagnant atmospheric conditions during hazy days promoted the formation of secondary organic pollutants.
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Received: 20 January 2017
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