气候变化领域集成服务门户(CCPortal): European NOx emissions in WRF-Chem derived from OMI: Impacts on summertime surface ozone

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DOI	10.5194/acp-19-11821-2019
	European NOx emissions in WRF-Chem derived from OMI: Impacts on summertime surface ozone
	Visser A.J.; Folkert Boersma K.; Ganzeveld L.N.; Krol M.C.
发表日期	2019
ISSN	16807316
起始页码	11821
结束页码	11841
卷号	19 期号:18
英文摘要	Ozone (O3) is a secondary air pollutant that negatively affects human and ecosystem health. Ozone simulations with regional air quality models suffer from unexplained biases over Europe, and uncertainties in the emissions of ozone precursor group nitrogen oxides (NOx= NO+NO) contribute to these biases. The goal of this study is to use NO2 column observations from the Ozone Monitoring Instrument (OMI) satellite sensor to infer top-down NOx emissions in the regional Weather Research and Forecasting model with coupled chemistry (WRF-Chem) and to evaluate the impact on simulated surface O3 with in situ observations. We first perform a simulation for July 2015 over Europe and evaluate its performance against in situ observations from the AirBase network. The spatial distribution of mean ozone concentrations is reproduced satisfactorily. However, the simulated maximum daily 8h ozone concentration (MDA8 O3) is underestimated (mean bias error of -14.2μgm-3), and its spread is too low. We subsequently derive satellite-constrained surface NOx emissions using a mass balance approach based on the relative difference between OMI and WRF-Chem NO2 columns. The method accounts for feedbacks through OH, NO2's dominant daytime oxidant. Our optimized European NOx emissions amount to 0.50TgN (for July 2015), which is 0.18TgN higher than the bottom-up emissions (which lacked agricultural soil NOx emissions). Much of the increases occur across Europe, in regions where agricultural soil NOx emissions dominate. Our best estimate of soil NOx emissions in July 2015 is 0.1TgN, much higher than the bottom-up 0.02TgN natural soil NOx emissions from the Model of Emissions of Gases and Aerosols from Nature (MEGAN). A simulation with satellite-updated NOx emissions reduces the systematic bias between WRF-Chem and OMI NO2 (slopeCombining double low line0.98, r2Combining double low line0.84) and reduces the low bias against independent surface NO2 measurements by 1.1μgm-3 (-56%). Following these NOx emission changes, daytime ozone is strongly affected, since NOx emission changes particularly affect daytime ozone formation. Monthly averaged simulated daytime ozone increases by 6.0μgm-3, and increases of >10μgm-3 are seen in regions with large emission increases. With respect to the initial simulation, MDA8 O3 has an improved spatial distribution, expressed by an increase in r2 from 0.40 to 0.53, and a decrease of the mean bias by 7.4μgm-3 (48%). Overall, our results highlight the dependence of surface ozone on its precursor NOx and demonstrate that simulations of surface ozone benefit from constraining surface NOx emissions by satellite NO2 column observations. © Author(s) 2019.
语种	英语
scopus关键词	air quality; atmospheric chemistry; atmospheric pollution; concentration (composition); nitrogen oxides; ozone; spatial distribution; summer; weather forecasting; Europe
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144139
作者单位	Wageningen University, Meteorology and Air Quality Section, Wageningen, Netherlands; Royal Netherlands Meteorological Institute, RandD Satellite Observations, De Bilt, Netherlands; Utrecht University, Institute for Marine and Atmospheric Research Utrecht, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Visser A.J.,Folkert Boersma K.,Ganzeveld L.N.,et al. European NOx emissions in WRF-Chem derived from OMI: Impacts on summertime surface ozone[J],2019,19(18).
APA	Visser A.J.,Folkert Boersma K.,Ganzeveld L.N.,&Krol M.C..(2019).European NOx emissions in WRF-Chem derived from OMI: Impacts on summertime surface ozone.Atmospheric Chemistry and Physics,19(18).
MLA	Visser A.J.,et al."European NOx emissions in WRF-Chem derived from OMI: Impacts on summertime surface ozone".Atmospheric Chemistry and Physics 19.18(2019).