[ACG59-P03] Estimation of atmospheric nitrogen deposition over the Kuroshio region in the Autumn of 2015
Keywords:Aerosol, Nitrogen deposition flux, Kuroshio
Atmospheric observations were carried out on the academic research ship Hakuho Maru KH -15-4 cruise. Atmospheric aerosol were collected using a filter pack method and a high volume air sampler during the cruise. These samples were analyzed for water-soluble ions by ion chromatography.
As a result of backward trajectory analysis, it was found that the beginning of the voyage was affected by the oceanic atmosphere, while the other periods were affected by air masses along the coast of East Asia or via the Japanese Islands. Nitrate concentrations in atmospheric aerosols were 1.2 ± 0.8 μg m-3, similar to those reported in previous studies of 1.8 ± 1.2 μg m-3 in the East China Sea, an order of magnitude higher than 0.17 ± 0.09 μg m-3 in the western North Pacific. We will discuss about the dry deposition of atmospheric nitrogen and its impact on primary production.