Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11765/12042
Multi-decadal surface ozone trends at globally distributed remote locations
Title: Multi-decadal surface ozone trends at globally distributed remote locations
Authors: Cooper, O. R.Schultz, M.Schröder, MarcChang, Kai-LanGaudel, A.Carbajal Benítez, GerardoCuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMETFröhlich, M.Galbally, I. E.Molloy, SuzieKubistin, DagmarLu, XiaoMcClure-Begley, A.Nédélec, PhilippeO’Brien, JasonOltmans, S. J.Petropavlovskikh, IrinaRies, LudwigSenik, IrinaSjöberg, KarinSolberg, SverreSpain, GerardSpangl, WolfgangSteinbacher, MartinTarasick, David W.Thouret, ValerieXu, X.
Keywords: Tropospheric Ozone; Trends; Global change; Trace gas
Issue Date: 2020
Publisher: University of California Press
Citation: Elementa: Science of the Anthropocene. 2020, 8:23, p. 1-34
Publisher version: https://dx.doi.org/10.1525/elementa.420
Abstract: Extracting globally representative trend information from lower tropospheric ozone observations is extremely difficult due to the highly variable distribution and interannual variability of ozone, and the ongoing shift of ozone precursor emissions from high latitudes to low latitudes. Here we report surface ozone trends at 27 globally distributed remote locations (20 in the Northern Hemisphere, 7 in the Southern Hemisphere), focusing on continuous time series that extend from the present back to at least 1995. While these sites are only representative of less than 25% of the global surface area, this analysis provides a range of regional long-term ozone trends for the evaluation of global chemistry-climate models. Trends are based on monthly mean ozone anomalies, and all sites have at least 20 years of data, which improves the likelihood that a robust trend value is due to changes in ozone precursor emissions and/or forced climate change rather than naturally occurring climate variability. Since 1995, the Northern Hemisphere sites are nearly evenly split between positive and negative ozone trends, while 5 of 7 Southern Hemisphere sites have positive trends. Positive trends are in the range of 0.5–2 ppbv decade–1, with ozone increasing at Mauna Loa by roughly 50% since the late 1950s. Two high elevation Alpine sites, discussed by previous assessments, exhibit decreasing ozone trends in contrast to the positive trend observed by IAGOS commercial aircraft in the European lower free-troposphere. The Alpine sites frequently sample polluted European boundary layer air, especially in summer, and can only be representative of lower free tropospheric ozone if the data are carefully filtered to avoid boundary layer air. The highly variable ozone trends at these 27 surface sites are not necessarily indicative of free tropospheric trends, which have been overwhelmingly positive since the mid-1990s, as shown by recent studies of ozonesonde and aircraft observations.
Sponsorship : The IAGOS program acknowledges the European Commission for its support of the MOZAIC project (1994–2003) the preparatory phase of IAGOS (2005–2013) and IGAS (2013–2016).
URI: http://hdl.handle.net/20.500.11765/12042
ISSN: 2325-1026
Appears in Collections:Artículos científicos 2019-2021


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