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RISS 인기검색어
- 검색키워드
- 저자 : M. Uematsu (검색결과 6 건)
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Jung, J.,Furutani, H.,Uematsu, M.,Park, J. Pergamon Press ; Elsevier [distribution] 2014 Atmospheric environment Vol.99 No.-
Atmospheric concentrations of non-sea-salt sulfate (nss-SO<SUB>4</SUB><SUP>2-</SUP>) and methanesulfonic acid (MSA) were measured over the Pacific Ocean between 48<SUP>o</SUP>N and 55<SUP>o</SUP>S during the KH-08-2 and MR08-06 cruises in summers of 2008 and 2009, in order to investigate spatial distributions of each species and MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio. In the subarctic western North Pacific, mean concentrations of nss-SO<SUB>4</SUB><SUP>2-</SUP> and MSA in bulk (fine + coarse) aerosols were 1.1 μg m<SUP>-3</SUP> and 0.061 μg m<SUP>-3</SUP>, whereas those in the South Pacific were 0.25 μg m<SUP>-3</SUP> and 0.043 μg m<SUP>-3</SUP>, respectively. In the subtropical western North Pacific, it was observed that nss-SO<SUB>4</SUB><SUP>2-</SUP> concentration sharply increased from 0.45 μg m<SUP>-3</SUP> up to 4.2 μg m<SUP>-3</SUP> under the dominant influence of the Kilauea volcano, while that of MSA remained low. Mean MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio observed in the South Pacific was approximately 3.7 times higher than that in the subarctic western North Pacific, although the mean MSA concentration in the subarctic western North Pacific was a factor of 1.4 higher than that in the South Pacific. The distributions of nss-SO<SUB>4</SUB><SUP>2-</SUP>, MSA, and MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio suggested that aerosol nss-SO<SUB>4</SUB><SUP>2-</SUP> plays a key role in the latitudinal variation in MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio over the North and South Pacific during summer periods, and that high MSA concentrations in the subarctic western North Pacific and the South Pacific were related to high biological productivity and low air temperature. During the cruises, an inverse relationship (r = -0.72, p < 0.01) was observed between satellite-derived chlorophyll a concentration and air temperature, showing that high biological productivity occurred at high latitudes, where air temperature were relatively low, in both hemispheres during the summer periods. Although both MSA concentration and MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio showed inverse and positive relationships with air temperature and chlorophyll a concentration, respectively, the correlations between these variables were weak, suggesting that the distributions of MSA concentration and MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratio over the North and South Pacific during the summer periods were influenced by more complex factors. Estimates using the MSA/nss-SO<SUB>4</SUB><SUP>2-</SUP> ratios measured in different latitude regions in the Pacific Ocean indicated that the contributions from biogenic sources accounted for 9.6-58% of the total nss-SO<SUB>4</SUB><SUP>2-</SUP> in aerosols collected in the subarctic western North Pacific, 15-85% in the subtropical western North Pacific, 10-70% in the central North Pacific, and 12-97% in the South Pacific, showing strong influence of anthropogenic nss-SO<SUB>4</SUB><SUP>2-</SUP> in the subarctic western North Pacific despite the higher mean concentration of MSA in the subarctic western North Pacific than in the South Pacific.
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Jung, J.,Furutani, H.,Uematsu, M.,Kim, S.,Yoon, S. Copernicus GmbH 2013 Atmospheric Chemistry and Physics Vol.13 No.1
<P>Abstract. Aerosol, rainwater, and sea fog water samples were collected during the cruise conducted over the subarctic western North Pacific Ocean in the summer of 2008, in order to estimate dry, wet, and sea fog deposition fluxes of atmospheric inorganic nitrogen (N). During sea fog events, mean number densities of particles with diameters larger than 0.5 μm decreased by 12-78%, suggesting that particles with diameters larger than 0.5 μm could act preferentially as condensation nuclei (CN) for sea fog droplets. Mean concentrations of nitrate (NO3−), methanesulfonic acid (MSA), and non sea-salt sulfate (nss-SO42−) in sea fog water were higher than those in rainwater, whereas those of ammonium (NH4+) in both sea fog water and rainwater were similar. These results reveal that sea fog scavenged NO3− and biogenic sulfur species more efficiently than rain. Mean dry, wet, and sea fog deposition fluxes for atmospheric total inorganic N (TIN; i.e. NH4+ + NO3−) over the subarctic western North Pacific Ocean were estimated to be 4.9 μmol m−2 d−1, 33 μmol m−2 d−1, and 7.8 μmol m−2 d−1, respectively. While NO3− was the dominant inorganic N species in dry and sea fog deposition, inorganic N supplied to surface waters by wet deposition was predominantly by NH4+. The contribution of dry, wet, and sea fog deposition to total deposition flux for TIN (46 μmol m−2 d−1) were 11%, 72%, and 17%, respectively, suggesting that ignoring sea fog deposition would lead to underestimate of the total influx of atmospheric inorganic N into the subarctic western North Pacific Ocean, especially in summer periods. </P>
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Quality Management System Proposed to JENDL Evaluation Project
N. Yamano,T. Yoshida,K. Nakajima,M. Ishikawa,K. Shibata,M. Uematsu,Y. Tahara 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A concept of the quality management system proposed for the Japanese Evaluated Nuclear Data Library (JENDL) is described. The concept is based on the process approach established as an International Standard of a quality management system (ISO 9001). In order to discuss how to guarantee the quality of JENDL, a working group focusing on a quality assurance strategy was established in the Japanese Nuclear Data Committee. After three years of discussions, the working group published a report about a quality management system for JENDL and proposed this work to the JENDL evaluation group of the Japan Atomic Energy Agency. The concept of quality management system of JENDL consists of five items: (1) Objective, (2) Organization, (3) Scope, (4) Quality Assurance, and (5) Quality Manual. The concept of the quality management system and the documented procedure have been presented.
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