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We measured total dissolved reactive nitrogen in precipitation samplescollected at Uljin, a Korean coastal site upwind of the southern East Sea/Sea of Japan (EJS), selected as a representative study site of atmospheric depositionover the northwestern Pacific margin. NO3- was found to be the mostabundant nitrogen species, followed by NH4+ and dissolved organicnitrogen (DON). Air-mass back-trajectory (AMBT) analysis revealed that a significantfraction of the inorganic nitrogen (NO3- and NH4+) originatedfrom mainland Asia, whereas the DON was primarily derived from Korea. Usingvarimax-rotated factor analysis in combination with major ions as tracers,agricultural activities in Korea were identified as the primary sources ofDON in these samples. In addition, a positive correlation was found at Uljinbetween the size of organic fraction in total reactive nitrogen and nitrogento carbon atomic ratio in organic matter. This correlation has also beenobserved at other locations worldwide, implying the utilization potential ofatmospheric organic nitrogen might increase with its proportion in totalnitrogen. Combining wet deposition measurements in this study with literaturevalues for dry deposition observed at a remote island in the EJS, the totalatmospheric depositional flux of reactive nitrogen was estimated to be115 mmol N m−2 yr−1 over the southern EJS. Our study sheds newlight on the potentially significant contribution to primary productivity ofthe northwestern Pacific Ocean by atmospheric deposition of nitrogen,especially the organic fraction

Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan