field characterization of the pm2.5 aerosol chemical speciation monitor: insights into the composition, sources, and processes of fine particles in eastern china
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2017
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Abstract
A PM2.5-capable aerosol chemical speciation monitor (Q-ACSM) was
deployed in urban Nanjing, China, for the first time to measure in situ
non-refractory fine particle (NR-PM2.5) composition from 20 October to
19 November 2015, along with parallel measurements of submicron aerosol
(PM1) species by a standard Q-ACSM. Our results show that the
NR-PM2.5 species (organics, sulfate, nitrate, and ammonium) measured by
the PM2.5-Q-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 Q-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 (SOAs)
being the two largest contributors (26 and 27 %, respectively). Positive
matrix factorization of organic aerosol showed similar temporal variations in
both primary and secondary OAs between PM1 and PM2.5, although the
mass spectra were slightly different due to more thermal decomposition on the
capture vaporizer of the PM2.5-Q-ACSM. We observed an enhancement of SOA
under high relative humidity conditions, which is associated with
simultaneous increases in aerosol pH, gas-phase species (NO2, SO2,
and NH3) concentrations and aerosol water content driven by secondary
inorganic aerosols. 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 secondary
inorganic aerosols but also the SOA burden during haze episodes in China.
| Reference Key |
zhang2017atmosphericfield
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|---|---|
| Authors | ;Y. Zhang;Y. Zhang;Y. Zhang;Y. Zhang;L. Tang;L. Tang;P. L. Croteau;O. Favez;Y. Sun;Y. Sun;Y. Sun;M. R. Canagaratna;Z. Wang;F. Couvidat;A. Albinet;H. Zhang;J. Sciare;A. S. H. Prévôt;J. T. Jayne;D. R. Worsnop |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-14501-2017
|
| URL | |
| Keywords |
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