Changes in the Relative Importance of Biogenic Isoprene and Soil NOx Emissions on Ozone Concentrations in Nonattainment Areas of the United States
Changes in the Relative Importance of Biogenic Isoprene and Soil NOx Emissions on Ozone Concentrations in Nonattainment Areas of the United States
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DOI：
10.1029/2021jd036361
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发表时间：
2022-07-16
影响因子：
4.4
通讯作者：
Wong, Anthony Y. H.
中科院分区：
文献类型：
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作者：
Geddes, Jeffrey A.;Pusede, Sally E.;Wong, Anthony Y. H.
人为排放的减少引起了人们对生物圈在美国城市臭氧生产化学中的作用的越来越多的关注。我们报道了化学传输模型敏感性模拟的结果，探讨了生物来源的异戊二烯和土壤氮氧化物(NOx)排放对O-3及其时间变异性的相对影响。我们比较了人为NOx排放量高和低的情景，这些情景代表了近几十年来发生的减排。正如预期的那样，随着人为NOx排放的减少，夏季O-3浓度对生物来源的异戊二烯排放的扰动变得不那么敏感。然而，我们首次证明，在美国与政策相关的O-3未达标地区，O-3对土壤NOx排放的扰动比对异戊二烯排放的相同扰动更敏感。我们表明，在许多地区，土壤NOx排放的年际变化现在可能比异戊二烯排放对O-3年际变化的影响更大，后者在最近的过去是占主导地位的。
Reductions in anthropogenic emissions have drawn increasing attention to the role of the biosphere in O-3 production chemistry in U.S. cities. We report the results of chemical transport model sensitivity simulations exploring the relative impacts of biogenic isoprene and soil nitrogen oxides (NOx) emissions on O-3 and its temporal variability. We compare scenarios with high and low anthropogenic NOx emissions representing the reductions that have occurred in recent decades. As expected, summertime O-3 concentrations become less sensitive to perturbations in biogenic isoprene emissions as anthropogenic NOx emissions decline. However, we demonstrate for the first time that across policy relevant O-3 nonattainment areas of the United States, O-3 becomes more sensitive to perturbations in soil NOx emissions than to identical perturbations in isoprene emissions. We show that interannual variability in soil NOx emissions may now have larger impacts on interannual O-3 variability than isoprene emissions in many areas where the latter would have dominated in the recent past.