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Pine needles formed in the previous year were collected in early spring before the formation of any new-year needles. The pine-needle samples collected from the campus were rinsed with acetone and distilled water using a supersonic cleaner and processed chemically by an acid-alkali-acid treatment to get rid of fats and oils as well as other pollutions contaminating the sample surface, and finally dried in an electric oven. A part of the samples were combusted to produce CO2 and the produced CO2 was changed to graphite for ^\u003c14\u003eC measurements with an AMS ^\u003c14\u003eC system at Nagoya University. The measured ^\u003c14\u003eC concentration was given in the ratio of sample ^\u003c14\u003eC/^\u003c12\u003eC to that of standard. For both sample and standard, isotopic fractionation was corrected. In addition, the decrease of ^\u003c14\u003eC concentration by radioactive decay for the sample from the year of collection to the year of ^\u003c14\u003eC measurement, and that for the standard from AD1950 to the year of ^\u003c14\u003eC measurement, were corrected. The following results were obtained in the present experiment: (1) ^\u003c14\u003eC concentrations were lower for the needles grown along the road with heavy traffic by about 1-2.5% than those grown at other places in the campus. This is caused by the local dilution of atmospheric ^\u003c14\u003eCO2 by ^\u003c14\u003eC-free CO2 exhausted from motor vehicles. (2) the values of ^\u003c14\u003eC concentration in average for the needles grown in the Higashiyama Campus were lower by 6.2% and 7.4% in 2005 and 2008, respectively, compared to an average value of 1.081±0.016 for the plants grown in the rather clean atmosphere almost free from artificial CO2 at the Tibetian Plateau at the altitude of 5000m above the mean sea level. (3) ^\u003c14\u003eC concentrations of the needle samples grown at the Higashiyama campus in 2008 is lower than those grown in 2005. 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環境試料の^<14>C濃度変動 : 名古屋大学東山キャンパスに生育する松の葉の^<14>C濃度の経年変動と生育場所依存性
https://doi.org/10.18999/sumrua.21.126
https://doi.org/10.18999/sumrua.21.12638d4eb1f-3b13-4024-a705-e358ce1da901
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2011-05-11 | |||||
タイトル | ||||||
タイトル | 環境試料の^<14>C濃度変動 : 名古屋大学東山キャンパスに生育する松の葉の^<14>C濃度の経年変動と生育場所依存性 | |||||
言語 | ja | |||||
その他のタイトル | ||||||
その他のタイトル | Variations of ^<14>C Concentration for Environmental Samples : Secular Variation and Locality Dependence of ^<14>C Concentration of Pine Needles Collected from the Higashiyama Campus of Nagoya University | |||||
言語 | en | |||||
著者 |
中村, 俊夫
× 中村, 俊夫× 太田, 友子× NAKAMURA, Toshio× OHTA, Tomoko |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | atmospheric CO2 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ^<14>C concentration | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Suess effect | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | fossil fuel | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | pine needle | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 大気中二酸化炭素 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ^<14>C濃度 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | シュース効果 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 化石燃料 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 松葉 | |||||
抄録 | ||||||
内容記述 | ^<14>C concentrations were measured for needle leaves from pine trees growing several locations on the Higashiyama campus of Nagoya University, in the east suburbs of Nagoya city, Aichi prefecture, central Japan, to investigate the local Suess effect of diluting ^<14>C concentration in the atmosphere by ^<14>C-free CO2 exhausted in combustion of fossil fuel, in particular, that from motor vehicles in Nagoya city. Pine needles formed in the previous year were collected in early spring before the formation of any new-year needles. The pine-needle samples collected from the campus were rinsed with acetone and distilled water using a supersonic cleaner and processed chemically by an acid-alkali-acid treatment to get rid of fats and oils as well as other pollutions contaminating the sample surface, and finally dried in an electric oven. A part of the samples were combusted to produce CO2 and the produced CO2 was changed to graphite for ^<14>C measurements with an AMS ^<14>C system at Nagoya University. The measured ^<14>C concentration was given in the ratio of sample ^<14>C/^<12>C to that of standard. For both sample and standard, isotopic fractionation was corrected. In addition, the decrease of ^<14>C concentration by radioactive decay for the sample from the year of collection to the year of ^<14>C measurement, and that for the standard from AD1950 to the year of ^<14>C measurement, were corrected. The following results were obtained in the present experiment: (1) ^<14>C concentrations were lower for the needles grown along the road with heavy traffic by about 1-2.5% than those grown at other places in the campus. This is caused by the local dilution of atmospheric ^<14>CO2 by ^<14>C-free CO2 exhausted from motor vehicles. (2) the values of ^<14>C concentration in average for the needles grown in the Higashiyama Campus were lower by 6.2% and 7.4% in 2005 and 2008, respectively, compared to an average value of 1.081±0.016 for the plants grown in the rather clean atmosphere almost free from artificial CO2 at the Tibetian Plateau at the altitude of 5000m above the mean sea level. (3) ^<14>C concentrations of the needle samples grown at the Higashiyama campus in 2008 is lower than those grown in 2005. This suggests that the Suess effect is getting larger in the Nagoya city area by about 1% in 2008 than in 2005. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | 第22回名古屋大学年代測定総合研究センターシンポジウム平成21(2009)年度報告 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | ja | |||||
出版者 | 名古屋大学年代測定資料研究センター | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
ID登録 | ||||||
ID登録 | 10.18999/sumrua.21.126 | |||||
ID登録タイプ | JaLC | |||||
書誌情報 |
ja : 名古屋大学加速器質量分析計業績報告書 巻 21, p. 126-135, 発行日 2010-03 |
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著者版フラグ | ||||||
値 | publisher |