We use the OMI-QA4ECV-v1.1 NO₂ tropospheric columns over the 10-year 2008–2017 period to confront satellite-based trends in NO₂ concentrations to those from the state-of-the-art regional chemistry-transport model CHIMERE and to evaluate the bottom-up anthropogenic and biogenic NO_x emissions in Europe. A focus is made for the 30 most populated urban areas in Europe. Over urban areas in Western Europe, except for coastal cities, OMI confirms the drop in the simulated CHIMERE NO₂ tropospheric columns based on the latest country emission official reporting. OMI hardly shows significant negative trends over Central and Eastern Europe urban areas. Increasing biogenic emissions helps reconciling CHIMERE and OMI trends over urban areas in Central Europe and over rural areas, confirming the importance of accounting for non-anthropogenic emissions to assess long-term trends. Over Eastern Europe, our results question emission reductions estimated for particular sectors and in particular the road transport, public power, and industrial emissions.

中文翻译：

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2008-2017 年人为和生物 NOx 排放分析：欧洲 30 个人口最多的城市地区的趋势评估

我们使用2008-2017 年 10 年期间的 OMI-QA4ECV-v1.1 NO ₂对流层柱来应对基于卫星的 NO ₂浓度趋势到最先进的区域化学传输模型 CHIMERE并评估欧洲自下而上的人为和生物源 NO _x排放。重点关注欧洲 30 个人口最多的城市地区。在西欧的城市地区，除了沿海城市，OMI 证实了模拟的 CHIMERE NO ₂基于最新国家排放官方报告的对流层列。OMI 在中欧和东欧城市地区几乎没有显示出明显的负面趋势。增加生物排放有助于协调中欧城市地区和农村地区的 CHIMERE 和 OMI 趋势，证实了考虑非人为排放以评估长期趋势的重要性。在东欧，我们的结果质疑特定部门的减排估计，特别是道路交通、公共电力和工业排放。