Contributions of anthropogenic and biogenic CO_2 to the atmosphere at an urban forest in winter season and their diurnal variations of vertical profiles
| Autor: | Takahashi, Hiroshi A., Konohira, Eiichi, Hiyama, Tetsuya, Minami, Masayo, Takahashi, Atsuhiro, Oguri, Hideyuki, Nakamura, Toshio |
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| Jazyk: | japonština |
| Rok vydání: | 2000 |
| Zdroj: | 名古屋大学加速器質量分析計業績報告書. 11:88-99 |
| Popis: | Diurnal variations of carbon isotopic compositions (Δ^C and δ^C) of atmospheric CO_2 as well as concentration in an urban area on 9 February, 1999 were measured. The carbon isotopic approach in the present study discriminated quantitative contributions from the several CO_2 sources, i.e., background, anthropogenic and biogenic components, in the urban atmosphere. The diurnal variations in vertical profiles in anthropogenic and biogenic components within the forest were estimated, and their contributions were ranged from 1.3 to 15.8% and from 1.6 to 7.8%, respectively. There was a little variation vertically at each time in the respective components, whereas anthropogenic CO_2 fluctuated largely according to the total atmospheric CO_2 variation. On the other hand, the biogenic CO_2 concentration remained relatively constant throughout the day. With regard to the vertical profiles, the biogenic contribution increases from the top to the floor of the forest with smooth gradient, while the anthropogenic contribution shows the mirror image profile against biogenic one. Both of them showed the large gradual change especially during the night. 第12回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成11 (1999年度)報告 名古屋大学タンデトロン加速器質量分析計第1号機の研究実績と1号機,2号磯の利用計画 |
| Databáze: | OpenAIRE |
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