Arctic Ocean Ventilation Studied with a Suite of Anthropogenic Halocarbon Tracers
Arctic Ocean Ventilation Studied with a Suite of Anthropogenic Halocarbon Tracers
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DOI：
10.1126/science.242.4879.746
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发表时间：
1988-11
期刊：
影响因子：
56.9
通讯作者：
M. Krysell;Douglas W.R. Wallace
中科院分区：
文献类型：
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作者：
M. Krysell;Douglas W.R. Wallace
在北冰洋深水中测量到了氯氟甲烷（CFM：CCl2F2 和 CCl3F）、甲基氯仿（CH3CCl3）和四氯化碳（CCl4）。这些化合物的海洋和大气库存来自已知的人为释放；由于 CFM 和 CCl4 也不发生化学反应，因此它们可以用作海洋环流的瞬时示踪剂。 CCl4 的输入历史比迄今为止识别的任何其他瞬态示踪剂都要长（~70 年）。这种漫长的输入历史，加上约 28 年的电子折叠时间尺度 (τ) 的增加，使得 CCl4 可能成为校准海洋吸收化石燃料 CO2 瞬态（τ 约 25 年）模型的最有用的示踪剂。北冰洋 Nansen 盆地的底层水含有可检测到的 CCl4，但无法检测到 CFM 和 CH3CCl3，这表明底层水已有约 50 年的历史，或者大气中的 CCl4 存在少量非人为成分（按体积计算<6 万亿分之一）。
The chlorofluoromethanes (CFMs: CCl2F2 and CCl3F), methyl chloroform (CH3CCl3), and carbon tetrachloride (CCl4) have been measured in deep waters of the Arctic Ocean. Oceanic and atmospheric inventories of these compounds result from known anthropogenic releases; because the CFMs and CCl4 are also chemically nonreactive, they can be used as transient tracers of ocean circulation. The input history of CCl4 is longer than that of any other transient tracer identified to date(∼70 years). This long input history, together with an e-folding time scale of increase(τ) of ∼28 years, makes CCl4 potentially the most useful tracer for calibrating models of the oceanic uptake of the fossil-fuel CO2 transient(τ ≈ 25 years). The bottom water of the Nansen Basin, Arctic Ocean, has detectable CCl4 but undetectable CFMs and CH3CCl3, which suggests either that the bottom water is ∼50 years old, or that there is a small, nonanthropogenic component of atmospheric CCl4(<6 parts per trillion by volume).