Important contributions of non-fossil fuel nitrogen oxides emissions.

ABSTRACT: Since the industrial revolution, it has been assumed that fossil-fuel combustions dominate increasing nitrogen oxide (NO_x) emissions. However, it remains uncertain to the actual contribution of the non-fossil fuel NO_x to total NO_x emissions. Natural N isotopes of NO₃^- in precipitation (δ¹⁵N_w-NO3-) have been widely employed for tracing atmospheric NO_x sources. Here, we compiled global δ¹⁵N_w-NO3- observations to evaluate the relative importance of fossil and non-fossil fuel NO_x emissions. We found that regional differences in human activities directly influenced spatial-temporal patterns of δ¹⁵N_w-NO3- variations. Further, isotope mass-balance and bott

SUBMITTER: Song W 

PROVIDER: S-EPMC7801390 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature