2015 Fiscal Year Final Research Report
Observations of the high-altitude atmosphere using a helicopter for the purpose of the evaluation of the formation of sulfate aerosols at a mountainous site in Hokuriku district
| Project/Area Number |
25400469
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Meteorology/Physical oceanography/Hydrology
|
|---|
| Research Institution | Toyama Prefectural University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HONOKI HIDEHARU 富山市科学博物館, 嘱託職員 (10373482)
SATOW KAZUHIDE 長岡工業高等専門学校, 名誉教授 (80113398)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | 過酸化水素 / 二酸化硫黄 / 硫酸エアロゾル / ヘリコプター / 大気汚染 / 山岳 |
|---|
| Outline of Final Research Achievements |
To elucidate the formation of sulfate aerosols at a mountainous site in Hokuriku district, the concentrations of trace gases over Imizu City, Toyama, Japan were measured during in summer as well as early spring using a helicopter. The concentrations of hydroperoxides were analyzed by a high performance liquid chromatography system within 5-10 minutes after the sampling. The hydrogen peroxide concentration was lowest at the surface, and the highest concentration was detected at altitudes of 6,000 and 8,000 ft. Significantly high concentrations of hydroperoxides were observed in August 2013 when air pollutants were transported from China. The concentration of hydrogen peroxide was higher than that of sulfur dioxide above 4,000 ft where the potential capacity of sulfur dioxide oxidation in the aqueous phase is large in summer. On the other hand, hydrogen peroxide was mostly lower than sulfur dioxide in the early spring. SO2 oxidation in cloud water may be suppressed during cold seasons.
|
| Free Research Field |
大気物理化学
|
