VARIATIONS OF CARBON ISOTOPIC RATIO OF ATMOSPHERIC CARBON DIOXIDE OVER JAPAN
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概要
- 論文の詳細を見る
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.
- 国立極地研究所の論文
著者
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張 紀久夫
阪大基:福井工大工
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Takata Morimasa
National Institute Of Polar Research
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Morimoto S
National Institute Of Polar Research Organization Of Information And Systems
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Nakazawa Takakiyo
Center for Atmospheric and Oceanic Studies, Tohoku University
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Morimoto Shinji
National Institute of Polar Research
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Nakazawa Takakiyo
Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
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TANAKA Masayuki
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University
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AOKI Shuhji
National Institute of Polar Research
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Morimoto S
National Inst. Polar Res. Tokyo Jpn
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Aoki Shuhji
Faculty Of Science Tohoku University
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Tanaka Masayuki
Center For Atmospheric And Oceanic Studies Faculty Of Science Tohoku University
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MORIMOTO Shinji
Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University
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Mae Shinji
Department Of Applied Physics Hokkaido University
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Nakazawa Takakiyo
Center For Atmospheric And Oceanic Studies Faculty Of Science
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清水 明
Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
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Mae S
Hokkaido Univ. Sapporo
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Tanaka Masayuki
Department Of Materials Science And Processing Graduate School Of Engineering Osaka University
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Mae Shinji
National Institute For Resources And Environment
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