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论文编号: 53
论文题目: Variation of atmospheric (CO2)-C-14 and its spatial distribution
英文论文题目: Variation of atmospheric (CO2)-C-14 and its spatial distribution
第一作者: Wu, SG
英文第一作者:
联系作者: Wu Shugang
英文联系作者: Wu Shugang
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发表年度: 2017
卷: 169
期:
页码: 116-121
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英文摘要: The atmospheric (CO2)-C-14 is usually presented in the Delta C-14 notation, which cannot reflect its absolute quantity change. This article presents the atmospheric radiocarbon activity concentrations (a(acn), reported in mBq/m(3)) in recent years at nine observation stations. The a(acn) at Schauinsland decrease from 1977 to 1993 but between 1993 and 2003 keeps at a relative steady state. Atmospheric a(acn)s were higher in the northern hemisphere than that in the southern hemisphere. The a(acn)s in the northern hemisphere show clear seasonal cycle with higher value in winter and lower value in summer, while this seasonality is not obvious in the southern hemisphere. Vegetation plays as a role of sink in summer and a role of source in winter, and atmosphere-biosphere radiocarbon exchange might be the main driver of the a(acn)s seasonality. The annual mean a(acn)s in both hemispheres show slightly increasing trends since 2002, which may be mainly caused by decreasing air-sea C-14 flux as the air-sea C-14 gradient decline.
刊物名称: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
英文刊物名称: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
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全文链接: http://www.sciencedirect.com/science/article/pii/S0265931X17300413
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