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To obtain evidence for secondary organic aerosol formation during the longrange transport of air masses over the East China Sea, we conducted fieldmeasurements in March 2012 at the Fukue atmospheric monitoring station,Nagasaki, in western Japan. The relative abundance of m/z 44 in fine organicaerosol mass spectra (f44) was measured by an Aerodyne aerosol chemicalspeciation monitor. The stable carbon isotope ratio (d13C) of low volatilewater soluble organic carbon (LV-WSOC) in the daily filter samples of totalsuspended particulate matter was also analyzed using an elemental analyzercoupled with an isotope ratio mass spectrometer. Additionally, in situmeasurements of NOx and NOy were performed using NOx and NOy analyzers. Themeasurements showed that, unlike the systematic trends observed in a previousfield study, a scatter plot for d13C of LV-WSOC versus f44 indicated a randomvariation. Comparison of f44 with the photochemical age estimated by the NOx toNOy ratio revealed that the f44 values distributing around 0.2 likely reached asaturation level already and the f44 values were significantly lower than theobserved f44, approximately 0.3, at Hedo in the previous study. These findingsimply that the saturation point of f44, and the use of f44 as an oxidationindicator, is case dependent.

Transboundary Secondary Organic Aerosol in Western Japan: An Observed Limitation of the f44 Oxidation Indicator