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DOI	10.1016/j.atmosenv.2021.118227
	Long-term changes in northern mid-latitude tropospheric ozone concentrations: Synthesis of two recent analyses
	Parrish D.D.; Derwent R.G.; Staehelin J.
发表日期	2021
ISSN	1352-2310
卷号	248
英文摘要	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. © 2021 Elsevier Ltd
关键词	Northern mid-latitude Ozone Trends Preindustrial ozone concentrations Troposphere
语种	英语
scopus关键词	Atmospheric movements; Atmospheric radiation; Boundary layers; Ozone; Ozone layer; Troposphere; Measurement data sets; Ozone concentration; Ozone measurements; Planetary boundary layers; Radiative forcings; Site environments; Tropospheric ozone; Tropospheric ozone concentration; Air pollution; ozone; anthropogenic source; concentration (composition); long-term change; midlatitude environment; ozone; seasonal variation; troposphere; air pollution; anthropology; Article; astronomy; boundary layer; carbon footprint; circadian rhythm; comparative study; concentration (parameter); controlled study; European; grid cell; latitude; modern times; priority journal; radiative forcing; rural area; season; surface property; 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/248572
作者单位	David.D.Parrish, LLC, Boulder, CO, United States; rdscientific, Newbury, Berkshire, United Kingdom; Institute for Atmospheric and Climate Science, ETH Zürich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Parrish D.D.,Derwent R.G.,Staehelin J.. Long-term changes in northern mid-latitude tropospheric ozone concentrations: Synthesis of two recent analyses[J],2021,248.
APA	Parrish D.D.,Derwent R.G.,&Staehelin J..(2021).Long-term changes in northern mid-latitude tropospheric ozone concentrations: Synthesis of two recent analyses.ATMOSPHERIC ENVIRONMENT,248.
MLA	Parrish D.D.,et al."Long-term changes in northern mid-latitude tropospheric ozone concentrations: Synthesis of two recent analyses".ATMOSPHERIC ENVIRONMENT 248(2021).