School of Earth System Science, Tianjin University, 300072, Tianjin, China.
Georgia Tech Shenzhen Institute, Tianjin University, 518071, Shenzhen, China.
Nat Commun. 2021 Jan 11;12(1):243. doi: 10.1038/s41467-020-20356-0.
Since the industrial revolution, it has been assumed that fossil-fuel combustions dominate increasing nitrogen oxide (NO) emissions. However, it remains uncertain to the actual contribution of the non-fossil fuel NO to total NO emissions. Natural N isotopes of NO in precipitation (δN) have been widely employed for tracing atmospheric NO sources. Here, we compiled global δN observations to evaluate the relative importance of fossil and non-fossil fuel NO emissions. We found that regional differences in human activities directly influenced spatial-temporal patterns of δN variations. Further, isotope mass-balance and bottom-up calculations suggest that the non-fossil fuel NO accounts for 55 ± 7% of total NO emissions, reaching up to 21.6 ± 16.6Mt yr in East Asia, 7.4 ± 5.5Mt yr in Europe, and 21.8 ± 18.5Mt yr in North America, respectively. These results reveal the importance of non-fossil fuel NO emissions and provide direct evidence for making strategies on mitigating atmospheric NO pollution.
自工业革命以来，人们一直认为化石燃料燃烧是氮氧化物（NO）排放增加的主要原因。然而，对于非化石燃料 NO 对总 NO 排放的实际贡献仍存在不确定性。降水（δN）中的天然氮同位素（NO）已被广泛用于追踪大气 NO 源。在这里，我们汇总了全球 δN 观测值，以评估化石和非化石燃料 NO 排放的相对重要性。我们发现，人类活动的区域差异直接影响 δN 变化的时空格局。此外，同位素质量平衡和自下而上的计算表明，非化石燃料 NO 占总 NO 排放量的 55±7%，在东亚分别达到 21.6±16.6Mt yr、在欧洲达到 7.4±5.5Mt yr、在北美达到 21.8±18.5Mt yr。这些结果揭示了非化石燃料 NO 排放的重要性，并为制定减轻大气 NO 污染的策略提供了直接证据。
Zotero 插件
