从14个CO2观测结果估计区域化石燃料CO2度:挑战和不确定性
Fabian Maier1, Ingeborg Levin1, Maksym Gachkivskyi1,2
1Institut für Umweltphysik, Heidelberg University, INF 229,69120 Heidelberg, Germany.
概括
使用放射性碳 (14C) 估计化石燃料二氧化碳余面临背景选择,核污染和生物圈呼吸等挑战. 这些因素对欧洲各地基于14C的二氧化碳余估计带来了重大不确定性.
科学领域:
- 大气化学 大气化学
- 通过放射性碳测年法进行测年.
- 碳循环研究 碳循环研究
背景情况:
- 估计区域化石燃料二氧化碳余 (ΔffCO2) 直接依赖于在背景下测量Δ14CO2耗尽.
- 这种方法面临的挑战是选择适当的Δ14CO2背景,潜在的核14CO2污染,以及通过14C丰富的生物圈呼吸进行掩盖.
研究的目的:
- 评估挑战,并估计欧洲基于14C的 ΔffCO2 估计中的潜在偏差和不确定性.
- 评估梅斯头 (MHD) 作为综合碳观测系统 (ICOS) 网络的背景站的代表性.
主要方法:
- 对Δ14CO2耗尽的分析以估计ΔffCO2.
- 通过背景电站选择,核污染和生物呼吸引入的偏差的评估.
- 对ICOS站点的基于14C的ΔffCO2估计中的不确定性量化.
主要成果:
- 梅斯头 (MHD) 被确定为ICOS网络的代表性背景站,平均ΔffCO2代表性偏差为0.1 ± 0.3 ppm.
- 在ICOS地点的核污染导致未经校正的中位数为25%的低偏差 ΔffCO2 估计.
- 通过14C丰富呼吸掩盖ΔffCO2可以导致类似于核污染的偏差,特别是在夏季.
结论:
- 该研究量化了基于14C的ΔffCO2估计中的显著不确定性,ICOS站的综合样本的不确定性几乎有一半超过50%.
- 解决核污染和生物呼吸效应对于准确的 ΔffCO2 估计至关重要.
- 这些发现凸显了使用放射性碳用于精确监测区域化石燃料二氧化碳余的复杂性和局限性.
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