JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 109, D19S12, doi:10.1029/2003JD003569, 2004
Multielemental analysis and characterization of fine aerosols at several key ACE-Asia sites
David D. Cohen,1 David Garton,1 Eduard Stelcer,1 Olga Hawas,1 Tao Wang,2 Steven Poon,2 Jiyoung Kim,3 Byoung Cheol Choi,3 Sung Nam Oh,3 Hye-Jung Shin,3 Mi Young Ko,3 and Mitsuo Uematsu4
Received 6 March 2003; revised 17 June 2003; accepted 16 July 2003; published 5 August 2004.
[1] PM2.5 and PM10 particle size fractions were measured every Wednesday and Sunday
for an 18-month period from 1 January 2001 at three key ACE-Asia sites: Hong Kong, Cheju Island in southern Korea, and Sado Island in Japan. Median 24 hour PM2.5 mass loadings of 29, 16, and 9.1 mg/m3 and coarse mass loadings of 33, 14, and 11 mg/m3 were measured at Hong Kong, Cheju, and Sado Island sites, respectively, during the study period. The corresponding maximum PM2.5 and coarse mass values for the three sites were 109, 81, and 78 mg/m3 and 101, 162, and 253 mg/m3, respectively. Accelerator-based ion beam analysis (IBA) techniques were used to quantify major components as well as significant trace elements. These included total hydrogen, black carbon, F, Na, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br, and Pb, with detection limits close to or below 1 ng/m3. The average PM2.5 percentage composition by weight across the three sites was estimated to be around (8.4 ± 4)% black carbon, (7.7 ± 7)% soil, (43 ± 14)% ammonium sulfate, (11 ± 16)% organic matter, (10 ± 12)% salinity, and (0.6 ± 0.3)% trace elements. Soil fingerprints for the east Asian region were generated using oxides of measured Al, Si, K, Ca, Ti, Mn, and Fe concentrations. The coarse fraction was dominated by wind blown soil (23%) and sea salts (48%). [PM10/PM2.5] mass ratios were typically (2.1 ± 0.4) averaged across all sites for the whole year. [PM10/PM2.5] mass ratios for the 21 IBA elements analyzed were also provided. This quantitative data providing both masses and dates over an 18-month period provide useful input for aerosol transport INDEX TERMS: 0305 Atmospheric Composition and Structure: modeling for the east Asia region.

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