Next Article in Journal
Caribbean Air Chemistry and Dispersion Conditions
Previous Article in Journal
An Alternative Estimate of Potential Predictability on the Madden–Julian Oscillation Phase Space Using S2S Models
Open AccessArticle

Chemical and Light Extinction Characteristics of Atmospheric Aerosols in Suburban Nanjing, China

by 1,2,*, 1,2, 1,2, 1,2, 3, 1,2 and 1,2
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
*
Author to whom correspondence should be addressed.
Atmosphere 2017, 8(8), 149; https://doi.org/10.3390/atmos8080149
Received: 7 July 2017 / Revised: 10 August 2017 / Accepted: 11 August 2017 / Published: 15 August 2017
(This article belongs to the Section Aerosols)
This work reports the chemical and light extinction characteristics of the atmospheric particles collected from January to November 2014 in suburban Nanjing. Size-segregated measurement results showed that more than 80% of the major aerosol components were concentrated in PM2.5. The concentration of PM2.5 was highest in winter and lowest in autumn. Specifically, K+ concentration peaked in late spring indicating heavy influences from straw burning, while sulfate concentration was highest in summer and its daytime concentration was also higher than its nighttime concentration, both reflecting a significant role of photochemical production. Nevertheless, except for sulfate, all other components had higher concentrations during nighttime, signifying the role of unfavorable meteorological conditions in exacerbating the air pollution. The IMPROVE formula was employed, which can reconstruct the PM2.5 mass and light extinction well. The light extinction was mainly contributed by (NH4)2SO4 and NH4NO3 (together 58.3%). Mass concentrations of all PM2.5 components increased significantly with the increase of pollution levels, but nitrate increased most rapidly; correspondingly, the contribution of nitrate to light extinction also increased quickly when pollution became heavy. Such results were different from those observed in Beijing-Tianjin-Hebei where sulfate increased most quickly. Our results thus highlight that reduction of vehicular NO2 is likely a priority for air quality improvement in Nanjing. Back trajectory analysis showed the dominance of the local air mass and the one from Huanghai, yet the air mass originated from Bohai, and passed though Shandong and north of Jiangsu province could deliver highly-polluted air to Nanjing, as well. View Full-Text
Keywords: atmospheric aerosols; chemical components; chemical characteristic; light extinction; pollution levels; air mass source atmospheric aerosols; chemical components; chemical characteristic; light extinction; pollution levels; air mass source
Show Figures

Figure 1

MDPI and ACS Style

Wu, D.; Zhang, F.; Ge, X.; Yang, M.; Xia, J.; Liu, G.; Li, F. Chemical and Light Extinction Characteristics of Atmospheric Aerosols in Suburban Nanjing, China. Atmosphere 2017, 8, 149.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop