2003 Fiscal Year Final Research Report Summary
The mechanism of the preferential elution of the major ion and oxygen isotope ratio in acidic snow melting water by acid shock in the snowfield of Japan
| Project/Area Number |
14580510
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | Nagaoka National College of Technology |
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Principal Investigator |
SATOW Kazuhide Nagaoka National College of Technology, Civil Engineering, Professor, 環境都市工学科, 教授 (80113398)
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| Co-Investigator(Kenkyū-buntansha) |
HATA Katsuji Nagaoka National College of Technology, Materials Engineering, Asst.Professor, 物質工学科, 助教授 (30042758)
YAMAGUCHI Hajime Nagaoka National College of Technology, Liberal Arts-Physics, Professor, 一般教育科, 教授 (00042747)
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| Project Period (FY) |
2002 – 2003
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| Keywords | acid snow (acid rain) / pH / acid shock / ion concentration / melting snow |
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| Research Abstract |
1.Field observation
To clarify the realities of an acid snow in Japan, snow pit studies was carried out at Moshiri, Hokkaido, as a cold area in Japan, and the snowfall sample was able to be obtained. Moreover, the precipitation once a day was gathered throughout the year at this school in Nagaoka City as a warm area. In addition, the snowfall samples were able to be obtained as a mountains snowfall at Mt.Myoko in Niigata Prefecture.
The values of pH were 4.3,3.9 and 3.9 at Nagaoka, Moshiri and Myoko. The concentration of NO3_3^-, as one of the main causes of an acid snow, at Nagaoka was 1.7 times as much as that at Moshiri, and 4 times at Myoko. The concentration of non-sea salt sulfuric acid ion at Nagaoka was 1.5 times as much as at Moshiri and 2.2 times at Myoko
The melting water of snow always flows out during winter from the deposited snow at Nagaoka according to the current observations. The flow out speed of the melting water was also different by the difference of the ionic species.
2.Experiment of melting snow
To search for the reason why the flow out speed of melting water of snow is different by the difference of the ionic species, experiments of e melting snow was made in the low temperature laboratory in this school.
The thermal analysis of the melting water of snow with different ions was carried out, to analyze the melting temperature and melting energy of uniting water and free water with different ion species and ion concentrations, and to find the relation of the easiness of the melting and freezing of acid snow. The difference of flow out speed between different ion species can be seen, but also between different snows. It seems to be related to different ions and ion concentrations.
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Research Products
(12 results)
