Size partitioning of particulate inorganic nitrogen species between the fine and coarse mode ranges and its implication to their deposition on the surface ocean |
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| Authors: | Kiyoshi Matsumoto Hideki Minami Yukiko Uyama Mitsuo Uematsu |
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| Institution: | 1. Faculty of Education and Human Sciences, University of Yamanashi, Kofu 400-8510, Japan;2. Ocean Research Institute, The University of Tokyo, Nakano-ku, Tokyo 164-8639, Japan;3. Department of Marine Biology and Sciences, Tokai University, Sapporo 005-8601, Japan;1. Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan, ROC;2. Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC;3. Center for Environmental Studies, National Central University, Jhungli, Taoyuan, Taiwan, ROC;4. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao 266100, PR China;2. College of Chemistry and Chemical Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, PR China;3. National Marine Hazard Mitigation Service, 6 Wangfen North Road, Beijing 100194, PR China;1. University of Washington, School of Oceanography, Box 357940, Seattle, WA 98115, United States;2. East Carolina University, Greenville, NC, United States;3. National Institute for Water and Atmospheric Research, Wellington, New Zealand;1. Institute of Coastal Research, Helmholtz-Zentrum Geesthacht GmbH, Germany;2. Institute for Hydrobiology and Fisheries Science, University of Hamburg, Germany;3. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany |
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| Abstract: | In order to discuss the dry deposition fluxes of atmospheric fixed nitrogen species, observations of aerosol chemistry including nitrate (NO3?) and ammonium (NH4+) were conducted at two islands, Rishiri Island and Sado Island, over the Sea of Japan. Although the atmospheric concentrations of particulate NH4+–N showed higher values than those of particulate NO3?–N at both sites, the dry deposition fluxes of the particulate NO3?–N were estimated to be higher than those of the particulate NH4+–N. This was caused by the difference of particle sizes between the particulate NO3? and NH4+; NH4+ was almost totally contained in fine particles (d < 2.5 μm) with smaller deposition velocity, whereas NO3? was mainly contained in coarse particles (d > 2.5 μm) with greater deposition velocity. Fine mode NO3? was strongly associated with fine mode sea-salt and mineral particles, of which higher concentrations shifted the size of particulate NO3? toward the fine mode range. This size shift would decrease the dry deposition flux of the fixed nitrogen species on coastal waters and accelerate atmospheric transport of them to the remote oceanic areas. |
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