Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-233
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 May 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Field characterization of the PM2.5 Aerosol Chemical Speciation Monitor: insights into the composition, sources and processes of fine particles in Eastern China
Yunjiang Zhang1,2,3,4, Lili Tang1,2, Philip L. Croteau5, Olivier Favez3, Yele Sun6, Manjula R. Canagaratna5, Zhuang Wang1, Florian Couvidat3, Alexandre Albinet3, Hongliang Zhang7, Jean Sciare8, André S. H. Prévôt9, John T. Jayne5, and Douglas R. Worsnop5 1Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China
2Jiangsu Environmental Monitoring Center, Nanjing 210036, China
3Institut National de l'Environnement Industriel et des Risques, Verneuil en Halatte, 60550, France
4Laboratoire des Sciences du Climat et de l'Environnement, CNRS-CEA-UVSQ, Université Paris-Saclay, Gif sur Yvette, 91191, France
5Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States
6State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
7Nanjing Handa Environmental Science and Technology Limited, Nanjing 211102, China
8The Cyprus Institute, Environment Energy and Water Research Center, Nicosia, Cyprus
9Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen PSI 5232, Switzerland
Abstract. A PM2.5-capable aerosol chemical speciation monitor (ACSM) was deployed in urban Nanjing, China for the first time to measure in-situ non-refractory fine particle (NR-PM2.5) composition from October 20 to November 19, 2015 along with parallel measurements of submicron aerosol (PM1) species by a standard ACSM. Our results show that the NR-PM2.5 species (organics, sulfate, nitrate, and ammonium) measured by the PM2.5-ACSM are highly correlated (r2 > 0.9) with those measured by a Sunset Lab OC/EC Analyzer and a Monitor for AeRosols and GAses (MARGA). The comparisons between the two ACSMs illustrated similar temporal variations in all NR species between PM1 and PM2.5, yet substantial mass fractions of aerosol species were observed in the size range of 1–2.5 μm. On average, NR-PM1–2.5 contributed 53 % of the total NR-PM2.5 with sulfate and secondary organic aerosols (SOA) being the two largest contributors (26 % and 27 %, respectively). Rapid formation and thereafter growth of secondary inorganic aerosols (SIA) were observed under fog processing in NH3-rich environments. Positive matrix factorization of organic aerosol showed similar temporal variations in both primary and secondary OA between PM1 and PM2.5 although the mass spectra were slightly different due to more thermal decomposition on the capture vaporizer of PM2.5-ACSM. We observed an enhancement of SOA under high relative humidity conditions, which is associated with simultaneous increases in particle surface area, gas-phase species (NO2, SO2, and NH3) concentrations and aerosol water content driven by anthropogenic SIA. These results likely indicate an enhanced reactive uptake of SOA precursors upon aqueous particles. Therefore, reducing anthropogenic NOx, SO2, and NH3 emissions might not only reduce SIA but also SOA burden during haze episodes in China.

Citation: Zhang, Y., Tang, L., Croteau, P. L., Favez, O., Sun, Y., Canagaratna, M. R., Wang, Z., Couvidat, F., Albinet, A., Zhang, H., Sciare, J., Prévôt, A. S. H., Jayne, J. T., and Worsnop, D. R.: Field characterization of the PM2.5 Aerosol Chemical Speciation Monitor: insights into the composition, sources and processes of fine particles in Eastern China, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-233, in review, 2017.
Yunjiang Zhang et al.
Yunjiang Zhang et al.
Yunjiang Zhang et al.

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