Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
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9
18
2009
10.5194/acp-9-6933-2009
http://www.atmos-chem-phys.net/9/6933/2009/
http://www.atmos-chem-phys.net/9/6933/2009/acp-9-6933-2009.html
http://www.atmos-chem-phys.net/9/6933/2009/acp-9-6933-2009.pdf
6933
6947
2009-09-22
Elevated nitrogen-containing particles observed in Asian dust aerosol samples collected at the marine boundary layer of the Bohai Sea and the Yellow Sea
H. Geng
Y. Park
H. Hwang
S. Kang
C.-U. Ro
curo@inha.ac.kr
Department of Chemistry, Inha University, Incheon, 402–751, Korea
Research Center of Environmental Science and Engineering, Shanxi University, Taiyuan, 030006, China
Korea Polar Research Institute, Incheon, 406–840, Korea
Low-<i>Z</i> particle electron probe X-ray microanalysis (low-<i>Z</i> particle EPMA) shows
powerful advantages for the characterization of ambient particulate matter
in environmental and geological applications. By the application of the
low-<i>Z</i> particle EPMA single particle analysis, an overall examination of 1800
coarse and fine particles (aerodynamic diameters: 2.5–10 μm and
1.0–2.5 μm, respectively) in six samples collected on 28 April–1 May 2006 in
the marine boundary layer (MBL) of the Bohai Sea and Yellow Sea was
conducted. Three samples (D1, D2, and D3) were collected along the Bohai
Bay, Bohai Straits, and Yellow Sea near Korea during an Asian dust storm
event while the other three samples (N3, N2, and N1) were collected on
non-Asian dust (NAD) days. Based on X-ray spectral and secondary electron
image data, 15 different types of particles were identified, in which
soil-derived particles were encountered with the largest frequency, followed
by (C, N, O)-rich droplets (likely the mixture of organic matter and
NH<sub>4</sub>NO<sub>3</sub>), particles of marine origin, and carbonaceous, Fe-rich,
fly ash, and (C, N, O, S)-rich droplet particles. Results show that during
the Asian dust storm event relative abundances of the (C, N, O)-rich
droplets and the nitrate-containing secondary soil-derived particles were
markedly increased (on average by a factor of 4.5 and 2, respectively in
PM<sub>2.5−10</sub> fraction and by a factor of 1.9 and 1.5, respectively in
PM<sub>1.0−2.5</sub> fraction) in the MBL of the Bohai Sea and Yellow Sea,
implying that Asian dust aerosols in springtime are an important carrier of
gaseous inorganic nitrogen species, especially NO<sub>x</sub> (or HNO<sub>3</sub>) and
NH<sub>3</sub>.
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