Single-Particle Characterization of Atmospheric Aerosols Collected at Gosan, Korea, during the Asian Pacific Regional Aerosol Characterization Experiment Field Campaign Using Low-Z (Atomic Number) Particle Electron Probe X-ray Microanalysis

Figures & data

Figure 1. Schematic map of the sampling site.

Table 1. Size distribution of the analyzed particles collected at Gosan on 4–10 April 2001

Percent of Measured Aerosol Particles in Different Diameter Range (%)
Size	<0.249 μm	0.25–0.49 μm	0.5–0.99 μm	1–1.99 μm	2–3.99 μm	4–7.99 μm	8–15.99 μm	16–31.99 μm	>32 μm	Total
Stage 1						42.0	45.6	10.8	1.6	100
Stage 2					7.4	63.6	28.6	0.3		100
Stage 3				15.3	47.6	36.2	0.9			100
Stage 4			7.0	27.8	56.9	8.3				100
Stage 5		5.3	28.4	55.0	11.3					100
Stage 6	6.1	31.0	41.2	21.7						100

Figure 2. Three-day (72-hr) backward air mass trajectories at sampling height (60 m above the sea level) from 4 to 10 April 2001. The backward air mass trajectories at the sampling site were obtained using the Hybrid Lagrangian Integrated Trajectory (HYSPLIT) model from the NOAA Air Resources Laboratory's web server (http://www.arl.noaa.gov/ready/hysplit4.html). On 11 April 2001, a severe dust storm front arrived at Gosan, so the air mass back trajectory was different from those on 4–10 April. (a) 04 April 2001; (b) 05 April 2001; (c) 06 April 2001; (d) 07 April 2001; (e) 08 April 2001; (f) 09 April 2001; (g) 10 April 2001; (h) 11 April 2001.

Figure 3. Relative abundances of various particle types in different size ranges for the aerosol samples collected at Gosan, Korea, on 4–10 April 2001.

Table 2. Relative abundances of different types of particles in different size ranges (on stages 1–6) for the samples collected at Gosan on 4–10 April 2001

		Relative Abundance on Average in Different Size Range (%)
No.	Particle Type	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6
1	Genuine sea salt	3.65 ± 1.04	5.57 ± 1.23	4.56 ± 2.65	6.65 ± 2.21	4.08 ± 1.28	3.08 ± 2.79
2	Reacted sea salt (+ mixture)	36.49 ± 5.90	53.92 ± 6.59	53.74 ± 4.60	66.59 ± 5.77	66.26 ± 4.74	20.93 ± 3.57
	(1) containing nitrates	25.39 ± 4.54	33.93 ± 5.90	36.85 ± 3.95	48.42 ± 4.71	29.49 ± 4.31	2.15 ± 1.41
	(2) containing SO4 ^2–/CH3SO3 ^–	3.05 ± 0.78	6.38 ± 1.45	6.07 ± 2.04	7.94 ± 2.16	14.85 ± 1.90	11.19 ± 2.88
	(3) containing both	9.05 ± 1.80	13.61 ± 1.53	10.82 ± 1.75	10.23 ± 1.60	21.92 ± 4.16	7.59 ± 1.09
3	Genuine mineral dust	44.27 ± 6.77	30.01 ± 4.98	30.41 ± 4.19	11.63 ± 1.63	12.92 ± 3.22	11.04 ± 3.03
4	Reacted mineral dust	2.20 ± 0.41	8.84 ± 2.94	7.24 ± 1.52	7.04 ± 1.74	6.05 ± 1.43	11.21 ± 4.29
	(1) containing nitrates	1.47 ± 0.20	1.14 ± 0.22	3.14 ± 1.19	2.85 ± 0.85	1.58 ± 0.55	3.34 ± 1.94
	(2) containing sulfates	0.44 ± 0.30	5.53 ± 2.59	1.63 ± 0.25	1.77 ± 0.49	2.91 ± 0.81	5.83 ± 3.02
	(3) containing both	0.29 ± 0.19	2.17 ± 0.71	2.47 ± 0.69	2.42 ± 0.74	1.56 ± 0.29	2.04 ± 0.96
5	(NH4)2SO4/NH4HSO4-containing	0	0	0.15 ± 0.07	0.26 ± 0.15	5.26 ± 2.01	38.42 ± 8.08
6	Elemental carbon (EC)-like	5.96 ± 2.51	0.54 ± 0.42	0.68 ± 0.25	0.59 ± 0.26	0.59 ± 0.14	0.79 ± 0.38
7	Organic carbon (OC)-like	6.98 ± 1.89	0.96 ± 0.13	2.33 ± 0.65	6.49 ± 4.86	3.34 ± 0.72	11.99 ± 4.24
8	Fe-rich	0.45 ± 0.21	0.16 ± 0.11	0.88 ± 0.30	0.56 ± 0.15	0.40 ± 0.29	1.82 ± 0.71
9	K-rich	0	0	0	0.19 ± 0.14	1.10 ± 0.30	0.71 ± 0.37
Note : All data are represented as mean ± SE.

Figure 4. Relative abundances of reacted (aged) sea salt and mineral dust particles containing nitrates, sulfates, and both. (a) Reacted sea salt particles; (b) reacted mineral dust particles.