| Project/Area Number |
11650567
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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 |
Civil and environmental engineering
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| Research Institution | Fukui University of Technology |
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Principal Investigator |
INOUE Yoriteru Fukui University, of Technology, Engineering, Professor, 工学部, 教授 (90025891)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Acid Rain / Acidic Deposition / Sulfur Dioxide / NOx / Yellow Sand |
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| Research Abstract |
The air at Fukui mainly comes from China Mainland except summer season. Fukui area is consisted of acidic soil and supposed to be affected by acidic deposition first in Japan. About 70% of Sulfur Dioxide (SO_2) and Nitrogen Oxide (NO_x), which are the main sources of acidic deposition, come from China Mainland. Yellow sand is also transported from China from late winter to early spring. Yellow sand is basic and is capable of neutralizing acidic deposition. Amount of acidic deposition at Fukui was calculated and was compared with observed data. Trajectory of air which arrives to Fukui was estimated and Sulfuric Acid and Nitric Acid to be formed during transportation was estimated using Eliassen's method for OECD study in Europe. Environmental Scientific Research Center of Fukui Prefecture observes acidic deposition at 18 points in Fukui Estimated and observed data compared. Sulfur dioxide are in same order but observed Nitrogen Oxides are one order higher than that of estimated. The reason may be observation is performed on the ground while estimation is done about one thousand meter above the ground due to the theoretical limitation. As the comparison of theoretical and observed values are completed, now it is possible to estimate future amount of acidic deposition at Fukui if source material of acid deposition (SO_2+ NO_x) generated at Eastern Asia is known.
Acid rain of Fukui was observed at Fukui University of Technology. PH of rain is usually from 3 to 5 while March to May, while yellow sand comes from China Mainland, raises 5 to 6. Yellow sand milden acidic rain but it is necessary to know the behavior of yellow sand after it reaches on the ground.
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