Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1992-12-01 |
タイトル |
|
|
タイトル |
VARIATIONS OF CARBON ISOTOPIC RATIO OF ATMOSPHERIC CARBON DIOXIDE OVER JAPAN |
言語 |
|
|
言語 |
eng |
資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
ID登録 |
|
|
ID登録 |
10.15094/00003752 |
|
ID登録タイプ |
JaLC |
ページ属性 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
P(論文) |
記事種別(英) |
|
|
|
en |
|
|
ABSTRACT |
論文名よみ |
|
|
その他のタイトル |
VARIATIONS OF CARBON ISOTOPIC RATIO OF ATMOSPHERIC CARBON DIOXIDE OVER JAPAN |
著者名よみ |
ナカザワ, タカキヨ
モリモト, シンジ
アオキ, シュンジ
タナカ, マサユキ
|
著者名(英) |
NAKAZAWA, Takakiyo
MORIMOTO, Shinji
AOKI, Shuhji
TANAKA, Masayuki
|
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
著者所属(英) |
|
|
|
en |
|
|
National Institute of Polar Research |
著者所属(英) |
|
|
|
en |
|
|
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University |
抄録(英) |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Carbon dioxide samples collected in the troposphere over Japan during the periods from April 1984 to November 1990 were analyzed for the carbon isotope ratio, δ^<13>C, with a precision of 0.03‰ (one standard deviation). The seasonal cycle of δ^<13>C decreased with increasing height, with a phase delay of about one month between the lower and upper troposphere, which was quite similar to that of the CO_2 concentration. It was found from the observed seasonal cycles of the CO_2 concentration and δ^<13>C that the rate of change in δ^<13>C with respect to the CO_2 concentration is about -0.05‰ per ppmv. This implies that the seasonal CO_2 cycle over Japan is mainly induced by seasonally dependent biospheric activities. However, the air transport from different latitudes is also important for the seasonal CO_2 cycle, especially in the upper troposphere. δ^<13>C decreased secularly at an average rate of about -0.03‰ per year due mainly to combustion of fossil fuels with lighter CO_2 relative to the atmospheric CO_2. Irregular variations of δ^<13>C with the periods of two or three years, superimposed on the secular trend, were also observed; they were almost in phase with these of the CO_2 concentration. From the comparison of both irregular variations, it was found that the cause could primarily attributed to the imbalance in CO_2 exchange between the atmosphere and biosphere in association with climate change, rather than between the atmosphere and oceans. |
雑誌書誌ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA10756213 |
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
巻 6,
p. 148,
発行日 1992-12
|
出版者 |
|
|
出版者 |
National Institute of Polar Research |