Fossil Versus Nonfossil CO Sources in the US: New Airborne Constraints From ACT‐America and GEM
Fossil Versus Nonfossil CO Sources in the US: New Airborne Constraints From ACT‐America and GEM
复制标题
美国化石与非化石二氧化碳来源：ACT–America 和 GEM 的新空气传播限制
DOI：
10.1029/2021gl093361
复制
发表时间：
2021
影响因子：
5.2
通讯作者：
Gvakharia, Alexander
中科院分区：
文献类型：
--
作者：
Gonzalez, Andres;Millet, Dylan B.;Yu, Xueying;Wells, Kelley C.;Griffis, Timothy J.;Baier, Bianca C.;Campbell, Patrick C.;Choi, Yonghoon;DiGangi, Joshua P.;Gvakharia, Alexander
一氧化碳（CO）是一种臭氧前体、氧化剂汇和广泛使用的污染示踪剂。在美国，人为来源与其他CO来源的重要性尚不确定。在这里，我们解释了广泛的空中测量与大气模型，以限制美国化石和非化石CO来源。测量结果显示，模拟的CO背景偏差较低，2016年国家排放清单中美国化石CO排放量高估了30%。优化后，我们应用该模型的源分区。在夏季，区域化石来源仅占采样边界层CO的9%-16%，占北美CO作为化石燃料示踪剂的增强复杂化使用的32%-38%。其余的主要反映了生物烃氧化加上火灾。化石来源在这个时候比非化石和背景贡献更少的域范围的空间变异性。区域化石贡献在其他季节上升，并驱动城市地区的下风向环境变化。
Carbon monoxide (CO) is an ozone precursor, oxidant sink, and widely used pollution tracer. The importance of anthropogenic versus other CO sources in the US is uncertain. Here, we interpret extensive airborne measurements with an atmospheric model to constrain US fossil and nonfossil CO sources. Measurements reveal a low bias in the simulated CO background and a 30% overestimate of US fossil CO emissions in the 2016 National Emissions Inventory. After optimization we apply the model for source partitioning. During summer, regional fossil sources account for just 9%–16% of the sampled boundary layer CO, and 32%–38% of the North American enhancement—complicating use of CO as a fossil fuel tracer. The remainder predominantly reflects biogenic hydrocarbon oxidation plus fires. Fossil sources account for less domain‐wide spatial variability at this time than nonfossil and background contributions. The regional fossil contribution rises in other seasons, and drives ambient variability downwind of urban areas.