Climatology and long-term evolution of ozone and carbon monoxide
in the UTLS at northern mid-latitudes, as seen by IAGOS from 1995
to 2013

Cohen, Yann; Pétetin, Hervé; Thouret, V.; Marécal, Virginie; Josse, B.; Clark, Hannah; Sauvage, Bastien; Fontaine, Alain; Athier, G.; Blot, Romain; Boulanger, Damien; Cousin, Jean-Marc; Nédélec, Philippe

doi:10.5194/acp-2017-778

Cited by 2 publications

(3 citation statements)

References 25 publications

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“…Finally, the particularly strong positive O3-CO relationship in terms of RO3-CO, dO3/dCO and COVO3-CO measured over and downwind North India/East China in summer in comparison with the one measured downwind East US and over Europe indicate that the South-East Asia experiences the most of the intense pollution episodes (COVO3-CO > 40×10 33 mol 2 .cm -4 ) with the largest O3 enhancement (dO3/dCO > 0.5) over the last decade, explaining the significant increase in IASI O3 levels (see Section 4.1) despite the net decrease in O3 precursor emissions recorded in China after 2011 (e.g. Cohen et al, 2017;Miyazaki et al, 2017).…”

Section: Continental Influencementioning

confidence: 99%

“…This tends to indicate that the tropospheric O3 increases resulting from the strong positive trend in Asian emissions over the past decades (e.g. Zhao et al, 2013;Cooper et al, 2014;Zhang et al, 2016;Cohen et al, 2017;Tarasick et al, 2017; and references therein) persists through 2008-2017 despite the recent decrease in O3 precursor emissions recorded in China after 2011 (e.g. Duncan et al, 2016;Krotkov et al, 2016;Miyazaki et al, 2017;Van der A et al 2017).…”

Section: Regression Performance and Sensitivity To Trendmentioning

confidence: 99%

“…This result could be explained by large perturbations in TOCs induced by recent decreases after decades of almost constant increases in surface emissions in China (e.g. Cohen et al, 2017;Miyazaki et al, 2017).…”

Section: Expected Year For Trend Detectionmentioning

confidence: 99%

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Decrease in tropospheric O3 levels of the Northern Hemisphere observed by IASI

Wespes¹,

Hurtmans²,

Clerbaux³

et al. 2017

Preprint

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Section: Continental Influencementioning

confidence: 99%

Section: Regression Performance and Sensitivity To Trendmentioning

confidence: 99%

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Decrease in tropospheric O3 levels of the Northern Hemisphere observed by IASI

Wespes¹,

Hurtmans²,

Clerbaux³

et al. 2017

Preprint

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Decrease in tropospheric O3 levels in the Northern Hemisphere observed by IASI

et al. 2018

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Abstract. In this study, we describe the recent changes in the tropospheric ozone (O3) columns measured by the Infrared Atmospheric Sounding Interferometer (IASI), onboard the Metop satellite, during the first 9 years of operation (January 2008 to May 2017). Using appropriate multivariate regression methods, we differentiate significant linear trends from other sources of O3 variations captured by IASI. The geographical patterns of the adjusted O3 trends are provided and discussed on the global scale. Given the large contribution of the natural variability in comparison with that of the trend (25–85 % vs. 15–50 %, respectively) to the total O3 variations, we estimate that additional years of IASI measurements are generally required to detect the estimated O3 trends with high precision. Globally, additional 6 months to 6 years of measurements, depending on the regions and the seasons, are needed to detect a trend of |5| DU decade−1. An exception is interestingly found during summer at mid- and high latitudes of the Northern Hemisphere (NH; ∼ 40 to ∼ 75∘ N), where the large absolute fitted trend values (∼ |0.5| DU yr−1 on average) combined with the small model residuals (∼ 10 %) allow for detection of a band-like pattern of significant negative trends. Despite no consensus in terms of tropospheric O3 trends having been reached from the available independent datasets (UV or IR satellites, O3 sondes, aircrafts, ground-based measurements, etc.) for the reasons that are discussed in the text, this finding is consistent with the reported decrease in O3 precursor emissions in recent years, especially in Europe and USA. The influence of continental pollution on that latitudinal band is further investigated and supported by the analysis of the O3–CO relationship (in terms of correlation coefficient, regression slope and covariance) that we found to be the strongest at northern midlatitudes in summer.

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Climatology and long-term evolution of ozone and carbon monoxide in the UTLS at northern mid-latitudes, as seen by IAGOS from 1995 to 2013

Cited by 2 publications

References 25 publications

Decrease in tropospheric O<sub>3</sub> levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O<sub>3</sub> levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O<sub>3</sub> levels in the Northern Hemisphere observed by IASI

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Climatology and long-term evolution of ozone and carbon monoxide in the UTLS at northern mid-latitudes, as seen by IAGOS from 1995 to 2013

Cited by 2 publications

References 25 publications

Decrease in tropospheric O&lt;sub&gt;3&lt;/sub&gt; levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O&lt;sub&gt;3&lt;/sub&gt; levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O&lt;sub&gt;3&lt;/sub&gt; levels in the Northern Hemisphere observed by IASI

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Decrease in tropospheric O<sub>3</sub> levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O<sub>3</sub> levels of the Northern Hemisphere observed by IASI

Decrease in tropospheric O<sub>3</sub> levels in the Northern Hemisphere observed by IASI