| Project/Area Number |
01540498
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
分析・地球化学
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
YOKOUCHI Yoko National Institute for Environmental Studies, Division of Global Environmental Research, Senior research scientist, 地球環境研究グループ, 主任研究員 (20125230)
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| Co-Investigator(Kenkyū-buntansha) |
AMBE Yoshinari Tokyo University of Agriculture and Technology Faculty of Agriculture, Professor, 農学部, 教授 (20101040)
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| Project Period (FY) |
1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1990: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Isoprene / Tropical Rain Forest / Biogenic Organics / 熱帯植物 / 大気 |
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| Research Abstract |
In order to understand the atmospheric chemistry of volatile organics emitted from the tropical rain forests, the following studies were done ; (1) development of an analytical method for isoprene in the atmosphere based on automated adsorptive sampling and capillary GC, GC/MS, (2) measurements of is oprene in the large greenhouse of tropical rain plants and evaluation of its emission rate, (3) measurements of diurnal variation of isoprene in the tropical forests in Thailand, (4) evaluation of the consumption of OH radicals by isoprene, (5) analyses of the emission gas from some representative tropical plants with capillary GC/MS.
Isoprene in the greenhouse showed significant variation with much higher concentration in the daytime, reflecting the influence of light intensity on the emission of isoprene. Based on the increase of concentration during the day, the emission rate of isoprene in April was calculated to be 1mg/m^2.
In the rain forest of Thailand, peak concentration of about 2 ppb of isoprene was observed around midday. In the evening and early in the morning, its concentration was nearly zero. The observed peak concentration of 2ppb was lower than expected from its high emission, which suggests its rapid consumption due to the reaction with OH radicals.
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