Geochemical studies of low molecular weight organic acids in the atmosphere: sources, formation pathways, and gas/particle partitioning.

Although elemental carbon (EC) in Chichijima aerosols showed a decreasing trend from 2001 to 2012 with seasonal peaks in winter/spring, organic carbon (OC) contents in the aerosols did not show a decline, rather indicating the decadal increases in OC/EC and OC/TC (total carbon) ratios. 14 ) Interestingly, oxalic acid and pyruvic acid concentrations were found to increase slightly for the observation period from 2001 to 2013. 15 ) Although LMW monoacids were not measured yet, the observations in the western North Pacific suggest a regime shift from inorganic to organic aerosols that may have occurred in East Asia and possibly on a global scale.

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