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To understand the influence of transboundary secondary organic aerosol (SOA)in the urban air of Fukuoka, we conducted simultaneous field studies inDecember 2010 and March 2012 on Fukue Island and in the city of Fukuoka,representing a rural and an urban sites of western Japan. During the studies,organic aerosol in PM1.0 was analyzed by aerosol mass spectrometers.Independently, airborne total suspended particulate matter (TSP) was collectedon filters, and low-volatile water soluble organic carbon (LV-WSOC) extractedfrom the TSP samples was analyzed by an elemental analyzer coupled with a highprecision isotope ratio mass spectrometer for its concentration and stablecarbon isotope ratio (d13C). Plots of LV-WSOC concentrations versus m/z 44concentrations for the study in December 2010 showed high correlations (r2 >0.85), but different slopes between the two sites (0.58 microg microgC-1 atFukuoka and 0.22 microg microgC-1 at Fukue), indicating additional contributionof m/z 44 from local sources. Because of this complex composition, evaluationof transboundary SOA was unsuccessful in this case study. In contrast,comparison of LV-WSOC concentrations with the m/z 44 concentrations during thestudy in March 2012 showed high correlations (r2 > 0.91) with similar slopes(0.3 microg microgC-1) at both sites, indicating predominance of transboundaryLV-WSOC. Furthermore, the plot of d13C of LV-WSOC as a function of m/z 44fraction showed a systematic increasing trend, indicating SOA. These findingssuggest that the observed LV-WSOC and m/z 44 in the Fukuoka air werepredominated by transboundary SOA in this case study.

Transboundary Secondary Organic Aerosol in the Urban Air of Fukuoka, Japan