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首页> 外文期刊>Atmospheric chemistry and physics >Spatial distribution of Δsup14/supCOsub2/sub across Eurasia: measurements from the TROICA-8 expedition
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Spatial distribution of Δsup14/supCOsub2/sub across Eurasia: measurements from the TROICA-8 expedition

机译：整个欧亚大陆中＆ 14 CO 2 的空间分布：TROICA-8探险队的测量

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Because fossil fuel derived CO2 is the only source of atmosphericCO2 that is devoid of 14C, atmospheric measurements of Δ14CO2can be used to constrain fossil fuel emission estimates atlocal and regional scales. However, at the continental scale, uncertaintiesin atmospheric transport and other sources of variability in Δ14CO2may influence the fossil fuel detection capability. Wepresent a set of Δ14CO2 observations from the train-basedTROICA-8 expedition across Eurasia in March–April 2004. Local perturbationsin Δ14CO2 are caused by easily identifiable sources fromnuclear reactors and localized pollution events. The remaining data show anincrease in Δ14CO2 from Western Russia (40° E) toEastern Siberia (120° E), consistent with depletion in 14CO2caused by fossil fuel CO2 emissions in heavily populated Europe, andgradual dispersion of the fossil fuel plume across Northern Asia.Other trace gas species which may be correlated with fossil fuel CO2emissions, including carbon monoxide, sulphur hexafluoride, andperchloroethylene, were also measured and the results compared with theΔ14CO2 measurements. The sulphur hexafluoride longitudinalgradient is not significant relative to the measurement uncertainty. Carbonmonoxide and perchloroethylene show large-scale trends of enriched values inWestern Russia and decreasing values in Eastern Siberia, consistent withfossil fuel emissions, but exhibit significant spatial variability,especially near their primary sources in Western Russia.The clean air Δ14CO2 observations are compared withsimulated spatial gradients from the TM5 atmospheric transport model. Weshow that the change in Δ14CO2 across the TROICA transectis due almost entirely to emissions of fossil fuel CO2, but that themagnitude of this Δ14CO2 gradient is relativelyinsensitive to modest uncertainties in the fossil fuel flux. In contrast,the Δ14CO2 gradient is more sensitive to the modeledrepresentation of vertical mixing, suggesting that Δ14CO2may be a useful tracer for training mixing in atmospheric transport models.
机译：由于化石燃料产生的CO 2 是唯一没有 14 C的大气CO 2 的来源，因此大气测量的Δ 14 < / sup> CO 2 可用于在局部和区域范围内限制化石燃料的排放估算。但是，在大陆范围内，大气传输的不确定性和Δ 14 CO 2 的其他变异性来源可能会影响化石燃料的探测能力。我们展示了2004年3月至4月横跨欧亚大陆的火车TROICA-8探险队的一组Δ 14 CO 2 观测结果。Δ 14 的局部扰动CO 2 是由易于识别的核反应堆来源和局部污染事件引起的。其余数据显示，俄罗斯西部（40°E）至西伯利亚东部（120°E）的Δ 14 CO 2 增加，与 14 2 的排放导致了sup> CO 2 的产生，化石燃料羽流在北亚逐渐扩散。 其他痕迹还测量了可能与化石燃料CO 2 排放有关的气体种类，包括一氧化碳，六氟化硫和全氯乙烯，并将结果与​​Δ 14 CO 2 个测量值。六氟化硫的纵向梯度相对于测量不确定度而言并不重要。一氧化碳和四氯乙烯在俄罗斯西部呈现出大量增值趋势，在西伯利亚东部呈下降趋势，这与化石燃料的排放量一致，但表现出明显的空间变异性，尤其是在俄罗斯西部的主要来源附近。 将Δ 14 CO 2 观测值与TM5大气传输模型的模拟空间梯度进行了比较。我们显示，TROICA横断面上的Δ 14 CO 2 的变化几乎完全归因于化石燃料CO 2 的排放，但其幅度Δ 14 CO 2 梯度对化石燃料通量的不确定性相对不敏感。相比之下，Δ 14 CO 2 梯度对垂直混合的模型表示更为敏感，表明Δ 14 CO 2 < / sub>对于在大气传输模型中训练混合可能是有用的示踪剂。

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