 |
| Titel |
Characterization of submicron aerosols at a rural site in Pearl River Delta of China using an Aerodyne High-Resolution Aerosol Mass Spectrometer |
| VerfasserIn |
X.-F. Huang, L.-Y. He, M. Hu, M. R. Canagaratna, J. H. Kroll, N. L. Ng, Y.-H. Zhang, Y. Lin, L. Xue, T.-L. Sun, X.-G. Liu, M. Shao, J. T. Jayne, D. R. Worsnop |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 5 ; Nr. 11, no. 5 (2011-03-01), S.1865-1877 |
| Datensatznummer |
250009435
|
| Publikation (Nr.) |
 copernicus.org/acp-11-1865-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Pearl River Delta (PRD) region in South China is one of the most
economically developed regions in China, but it is also noted for its severe
air pollution due to industrial/metropolitan emissions. In order to
continuously improve the understanding and quantification of air pollution
in this region, an intensive campaign was executed in PRD during
October–November 2008. Here, we report and analyze Aerodyne
High-Resolution Aerosol Mass Spectrometer measurements at Kaiping, a rural
site downwind of the highly-polluted central PRD area, to characterize the
general features of submicron particulate pollution in the regional air. The
mean measured PMsub>1 mass concentration was 33.1±18.1 μg m−3
during the campaign and composed of organic matter (33.8%),
sulfate (33.7%), ammonium (14.0%), nitrate (10.7%), black carbon
(6.7%), and chloride (1.1%), which is characterized by high fractions
of inorganic ions due to huge emissions of SO2 and NOx in PRD. The
average size distributions of the species (except BC) were all dominated by
an accumulation mode peaking at ~450 nm in vacuum aerodynamic
diameter. Calculations based on high-resolution organic mass spectra
indicate that C, H, O, and N on average contributed 56.6, 7.0, 35.1, and
1.3% to the total organic mass, respectively, corresponding to an organic
matter mass to organic carbon mass ratio (OM/OC) of 1.77±0.08. Based on
the high-resolution organic mass spectral dataset observed, Positive Matrix
Factorization (PMF) analysis differentiated the organic aerosol into three
components, i.e., biomass burning (BBOA) and two oxygenated (LV-OOA and
SV-OOA) organic aerosols, which on average accounted for 24.5, 39.6 and
35.8% of the total organic mass, respectively. The BBOA showed strong
features of biomass burning emissions and has been mainly attributed to the
open field burning of crop residues after the harvest in PRD rural areas.
The LV-OOA and SV-OOA were found to correspond to more aged (and thus
less-volatile) and fresher (and semi-volatile) secondary organic aerosol
(SOA), respectively. Analysis of meteorological influence supported that
regional transport from the central PRD area was the major origin of the
PM1 observed at the Kaiping site. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|