当前位置: X-MOL 学术Atmos. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Long-term changes in northern mid-latitude tropospheric ozone concentrations: Synthesis of two recent analyses
Atmospheric Environment ( IF 4.2 ) Pub Date : 2021-01-26 , DOI: 10.1016/j.atmosenv.2021.118227
David D. Parrish , Richard G. Derwent , Johannes Staehelin

The HTAP (Hemispheric Transport of Air Pollution) and TOAR (Tropospheric Ozone Assessment Report) programs synthesized historical ozone measurements and compared them with recent measurements to quantify the long-term increase of tropospheric ozone concentrations that occurred at northern mid-latitudes in the 20th century due to the increase and subsequent stabilization of anthropogenic ozone precursor emissions. The two studies disagree regarding the magnitude of the increase; the HTAP study found an approximate doubling of baseline ozone concentrations, while the TOAR study suggested a change of about half that magnitude in the well-mixed planetary boundary layer. Here we explore the reasons for this difference, and reconcile the results. The two efforts agree regarding measurements of historical ozone concentrations, but disagree on the comparison of the historical to the modern data. HTAP analyzed seasonal mean historical and modern data from the same or closely equivalent, baseline sites. TOAR selected pre-1975 measurement data sets based upon four data selection criteria; averages of these selected data sets from all seasons, site locations and site environments were compared with annual means of modern data collected at rural European surface sites. The TOAR comparison approach introduced several biases that led to underestimates of the overall change of baseline ozone. We conclude that northern mid-latitude tropospheric baseline ozone concentrations, which are relevant for radiative forcing, increased by a factor of 2.1 ± 0.2 over the 1950–2000 period.



中文翻译:

北部中纬对流层臭氧浓度的长期变化:两项最新分析的综合

HTAP(大气污染的半球运输)和TOAR(对流层臭氧评估报告)程序综合了历史臭氧测量值,并将其与最近的测量值进行了比较,以量化20世纪中纬度北半球对流层臭氧浓度的长期增加由于人为造成的臭氧前体排放量增加并随后趋于稳定。两项研究在增加幅度上意见不一致。HTAP研究发现基准臭氧浓度大约增加了一倍,而TOAR研究则表明,在充分混合的行星边界层中,臭氧浓度大约改变了一半。在这里,我们探讨了造成这种差异的原因,并调和了结果。两项工作在历史臭氧浓度的测量方面达成共识,但是不同意将历史数据与现代数据进行比较。HTAP分析了来自相同或相似基准站点的季节性平均历史和现代数据。TOAR根据四个数据选择标准选择了1975年前的测量数据集;将来自所有季节,站点位置和站点环境的这些选定数据集的平均值与在欧洲农村地面站点收集的年度现代数据进行比较。TOAR比较方法引入了一些偏见,导致低估了基准臭氧的总体变化。我们得出的结论是,与辐射强迫有关的北中纬度对流层基线臭氧浓度在1950-2000年期间增加了2.1±0.2倍。HTAP分析了来自相同或相似基准站点的季节性平均历史和现代数据。TOAR根据四个数据选择标准选择了1975年前的测量数据集;将所有季节,站点位置和站点环境中所选数据集的平均值与在欧洲农村地面站点收集的年度现代数据进行比较。TOAR比较方法引入了一些偏见,导致低估了基准臭氧的总体变化。我们得出的结论是,与辐射强迫有关的北中纬度对流层基线臭氧浓度在1950-2000年期间增加了2.1±0.2倍。HTAP分析了来自相同或相似基准站点的季节性平均历史和现代数据。TOAR根据四个数据选择标准选择了1975年前的测量数据集;将所有季节,站点位置和站点环境中所选数据集的平均值与在欧洲农村地面站点收集的年度现代数据进行比较。TOAR比较方法引入了一些偏见,导致低估了基准臭氧的总体变化。我们得出的结论是,与辐射强迫有关的北中纬度对流层基线臭氧浓度在1950-2000年期间增加了2.1±0.2倍。将所有季节,站点位置和站点环境中所选数据集的平均值与在欧洲农村地面站点收集的年度现代数据进行比较。TOAR比较方法引入了一些偏见,导致低估了基准臭氧的总体变化。我们得出的结论是,与辐射强迫有关的北中纬度对流层基线臭氧浓度在1950-2000年期间增加了2.1±0.2倍。将所有季节,站点位置和站点环境中所选数据集的平均值与在欧洲农村地面站点收集的年度现代数据进行比较。TOAR比较方法引入了一些偏见,导致低估了基准臭氧的总体变化。我们得出的结论是,与辐射强迫有关的北中纬度对流层基线臭氧浓度在1950-2000年期间增加了2.1±0.2倍。

更新日期:2021-02-05
down
wechat
bug