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DOI10.1016/j.atmosenv.2021.118334
Temperature dependence of tropospheric ozone under NOx reductions over Germany
Otero N.; Rust H.W.; Butler T.
发表日期2021
ISSN1352-2310
卷号253
英文摘要Due to the strong temperature dependence of surface ozone concentrations (O3), future warmer conditions may worsen ozone pollution levels despite continued efforts on emission controls of ozone precursors. Using long-term measurements of hourly O3 concentrations co-located with NOx concentrations in stations distributed throughout Germany, we assess changes in the climate penalty in summertime, defined as the slope of ozone-temperature relationship during the period 1999–2018. We find a stronger temperature sensitivity in the urban stations over the southwestern regions, especially in the first period of the study (1999–2008). We show a decrease in the climate penalty in most of stations during the second period of the study (2009–2018), with some exceptions (e.g. Berlin) where the climate penalty did not show significant changes. A key motivation of this study is to provide further insights into the impacts of NOx reductions in the O3-temperature relationship. For that, we propose a statisti-cal approach based on Generalized Additive Models (GAMs) to describe ozone production rates, inferred from hourly observations, as a function of NOx and temperature, among other variables relevant during the O3 production. The GAMs confirm lower O3 production rates during the second period (2009–2018) at most of the stations and a decreasing sensitivity to temperature. We observe that a large number of stations are transitioning to NOx-limited chemistry, consistent with a decreasing temperature dependence of O3 at moderate-high temperatures as a result of sustained NOx reductions. Moreover, the GAMs results showed changes in the shape of the function representing the O3-temperature relationship when comparing the first and second period, which suggest changes in VOC influencing the temperature dependence of O3. From these results, we infer effective VOC reductions over time that have also contributed to the observed decrease of O3 production rates. Thus, our analysis indicates that emissions reductions have been effective in a number of stations, particularly in the southwestern regions. However, we notice that in a few stations (e.g. Berlin) additional emission reductions should be required to effectively mitigate the temperature dependence of O3. © 2021 The Author(s)
关键词Climate penaltyGAMsSurface ozoneTemperature dependence
语种英语
scopus关键词Emission control; Nitrogen oxides; Ozone; Climate penalty; Emission reduction; Generalized additive model; NO$-x$; NO$-x$/ reduction; Production rates; Surface ozone; Surface ozone concentrations; Temperature dependence; Tropospheric ozone; Temperature distribution; nitrogen oxide; ozone; emission control; nitric oxide; observational method; ozone; reduction; spatiotemporal analysis; temperature effect; troposphere; volatile element; volatile organic compound; air pollution control; Article; climate; environmental impact; Germany; high temperature; precursor; priority journal; reduction (chemistry); temperature dependence; temperature sensitivity; troposphere
来源期刊ATMOSPHERIC ENVIRONMENT
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/248500
作者单位Institute for Advanced Sustainability Studies, Potsdam, Germany; Institut Für Meteorologie, Freie Universität Berlin, Germany
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GB/T 7714
Otero N.,Rust H.W.,Butler T.. Temperature dependence of tropospheric ozone under NOx reductions over Germany[J],2021,253.
APA Otero N.,Rust H.W.,&Butler T..(2021).Temperature dependence of tropospheric ozone under NOx reductions over Germany.ATMOSPHERIC ENVIRONMENT,253.
MLA Otero N.,et al."Temperature dependence of tropospheric ozone under NOx reductions over Germany".ATMOSPHERIC ENVIRONMENT 253(2021).
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