Trends in polar ozone loss since 1989: potential sign of recovery in the Arctic ozone column by A. Pazmiño, F. Goutail, S. Godin-Beekmann, A. Hauchecorne, J.-P. Pommereau, M. P. Chipperfield, M. P. Chipperfield, W. Feng, W. Feng, F. Lefèvre, A. Lecouffe, M. Van Roozendael, N. Jepsen, G. Hansen, R. Kivi, K. Strong, K. A. Walker

“…<p>Ozone depletion over the polar regions is monitored each year by satellite- and ground-based instruments. …”
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Opinion: Stratospheric ozone – depletion, recovery and new challenges by M. P. Chipperfield, M. P. Chipperfield, S. Bekki

“…<p>We summarise current important and well-established open issues related to the depletion of stratospheric ozone and discuss some newly emerging challenges. …”
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Quantifying the tropospheric ozone radiative effect and its temporal evolution in the satellite era by R. J. Pope, R. J. Pope, A. Rap, M. A. Pimlott, B. Barret, E. Le Flochmoen, B. J. Kerridge, B. J. Kerridge, R. Siddans, R. Siddans, B. G. Latter, B. G. Latter, L. J. Ventress, L. J. Ventress, A. Boynard, A. Boynard, C. Retscher, W. Feng, W. Feng, R. Rigby, R. Rigby, S. S. Dhomse, S. S. Dhomse, C. Wespes, M. P. Chipperfield, M. P. Chipperfield

“…<p>Using state-of-the-art satellite ozone profile products, and a chemical transport model, we provide an updated estimate of the tropospheric ozone radiative effect (TO<span class="inline-formula">₃</span>RE) and observational constraint on its variability over the decade 2008–2017. …”
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Projections of UV radiation changes in the 21st century: impact of ozone recovery and cloud effects by A. F. Bais, K. Tourpali, A. Kazantzidis, H. Akiyoshi, S. Bekki, P. Braesicke, M. P. Chipperfield, M. Dameris, V. Eyring, H. Garny, D. Iachetti, P. Jöckel, A. Kubin, U. Langematz, E. Mancini, M. Michou, O. Morgenstern, T. Nakamura, P. A. Newman, G. Pitari, D. A. Plummer, E. Rozanov, T. G. Shepherd, K. Shibata, W. Tian, Y. Yamashita

“…Our calculations show the influence of ozone depletion and recovery on erythemal irradiance. …”
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Early unusual ozone loss during the Arctic winter 2002/2003 compared to other winters by F. Goutail, J.-P. Pommereau, F. Lefèvre, M. van Roozendael, S. B. Andersen, B.-A. Kåstad Høiskar, V. Dorokhov, E. Kyrö, M. P. Chipperfield, W. Feng

“…Ozone loss during the winter 2002/2003 has been evaluated from comparisons between total ozone reported by the SAOZ network and simulated in passive mode by both REPROBUS and SLIMCAT. …”
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Effects of reanalysis forcing fields on ozone trends and age of air from a chemical transport model by Y. Li, S. S. Dhomse, S. S. Dhomse, M. P. Chipperfield, M. P. Chipperfield, W. Feng, W. Feng, A. Chrysanthou, Y. Xia, D. Guo

“…For total column ozone (TCO) comparisons, we use the Copernicus Climate Change Service (C3S) data (1979–2019), while for ozone profiles we use the Stratospheric Water and OzOne Satellite Homogenized (SWOOSH) data set (1984–2019). …”
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Mid-latitude ozone changes: studies with a 3-D CTM forced by ERA-40 analyses by W. Feng, M. P. Chipperfield, M. Dorf, K. Pfeilsticker, P. Ricaud

“…The analyses capture much of the observed interannual variability in column ozone, but there are also unrealistic features. In particular the ERA-40 analyses cause a large positive anomaly in northern hemisphere (NH) column O₃ in the late 1980s. …”
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Investigation of the summer 2018 European ozone air pollution episodes using novel satellite data and modelling by R. J. Pope, R. J. Pope, B. J. Kerridge, B. J. Kerridge, M. P. Chipperfield, M. P. Chipperfield, R. Siddans, R. Siddans, B. G. Latter, B. G. Latter, L. J. Ventress, L. J. Ventress, M. A. Pimlott, W. Feng, W. Feng, E. Comyn-Platt, G. D. Hayman, S. R. Arnold, A. M. Graham

“…<p>In the summer of 2018, Europe experienced an intense heatwave which coincided with several persistent large-scale ozone (<span class="inline-formula">O₃</span>) pollution episodes. …”
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Investigation of spatial and temporal variability in lower tropospheric ozone from RAL Space UV–Vis satellite products by R. J. Pope, R. J. Pope, B. J. Kerridge, B. J. Kerridge, R. Siddans, R. Siddans, B. G. Latter, B. G. Latter, M. P. Chipperfield, M. P. Chipperfield, W. Feng, W. Feng, M. A. Pimlott, S. S. Dhomse, S. S. Dhomse, C. Retscher, R. Rigby, R. Rigby

“…<p>Ozone is a potent air pollutant in the lower troposphere and an important short-lived climate forcer (SLCF) in the upper troposphere. …”
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Quantifying stratospheric ozone trends over 1984–2020: a comparison of ordinary and regularized multivariate regression models by Y. Li, Y. Li, S. S. Dhomse, S. S. Dhomse, M. P. Chipperfield, M. P. Chipperfield, W. Feng, W. Feng, J. Bian, J. Bian, J. Bian, Y. Xia, D. Guo

“…We use the Stratospheric Water and OzOne Satellite Homogenized (SWOOSH) merged dataset (v2.7) to derive stratospheric ozone profile trends for the period 1984–2020. …”
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Atmospheric impacts of chlorinated very short-lived substances over the recent past – Part 2: Impacts on ozone by E. M. Bednarz, E. M. Bednarz, E. M. Bednarz, R. Hossaini, R. Hossaini, M. P. Chipperfield, M. P. Chipperfield

“…The largest ozone reductions were simulated in the Arctic in the springs of 2011 and 2020. …”
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Description and evaluation of the new UM–UKCA (vn11.0) Double Extended Stratospheric–Tropospheric (DEST vn1.0) scheme for comprehensive modelling of halogen chemistry in the strato... by E. M. Bednarz, E. M. Bednarz, E. M. Bednarz, R. Hossaini, R. Hossaini, N. L. Abraham, N. L. Abraham, M. P. Chipperfield, M. P. Chipperfield

“…These allow process-oriented studies of stratospheric ozone depletion and recovery, including the impacts from both controlled long-lived ozone-depleting substances (ODSs) and emerging issues around uncontrolled very short-lived substances (VSLS). …”
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Influence of the wintertime North Atlantic Oscillation on European tropospheric composition: an observational and modelling study by R. J. Pope, R. J. Pope, M. P. Chipperfield, M. P. Chipperfield, S. R. Arnold, N. Glatthor, W. Feng, W. Feng, S. S. Dhomse, B. J. Kerridge, B. G. Latter, R. Siddans

“…NAO-high introduces Atlantic ozone-enriched air into Europe, while under NAO-low westerly transport of ozone is reduced, yielding lower values over Europe. …”
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Description and evaluation of the UKCA stratosphere–troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1 by A. T. Archibald, A. T. Archibald, F. M. O'Connor, N. L. Abraham, N. L. Abraham, S. Archer-Nicholls, M. P. Chipperfield, M. P. Chipperfield, M. Dalvi, G. A. Folberth, F. Dennison, F. Dennison, S. S. Dhomse, S. S. Dhomse, P. T. Griffiths, P. T. Griffiths, C. Hardacre, A. J. Hewitt, R. S. Hill, C. E. Johnson, J. Keeble, J. Keeble, M. O. Köhler, M. O. Köhler, M. O. Köhler, O. Morgenstern, J. P. Mulcahy, C. Ordóñez, C. Ordóñez, R. J. Pope, R. J. Pope, S. T. Rumbold, M. R. Russo, M. R. Russo, N. H. Savage, A. Sellar, M. Stringer, S. T. Turnock, O. Wild, G. Zeng

“…The analysis we present here focuses on key components of atmospheric composition, namely the performance of the model to simulate ozone in the stratosphere and troposphere and constituents that are important for ozone in these regions. …”
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Exploiting satellite measurements to explore uncertainties in UK bottom-up NO_<i>x</i> emission estimates by R. J. Pope, R. J. Pope, R. Kelly, E. A. Marais, A. M. Graham, C. Wilson, C. Wilson, J. J. Harrison, J. J. Harrison, S. J. A. Moniz, M. Ghalaieny, S. R. Arnold, M. P. Chipperfield, M. P. Chipperfield

“…<p>Nitrogen oxides (NO<span class="inline-formula">_<i>x</i></span>, NO <span class="inline-formula">+</span> NO<span class="inline-formula">₂</span>) are potent air pollutants which directly impact on human health and which aid the formation of other hazardous pollutants such as ozone (O<span class="inline-formula">₃</span>) and particulate matter. …”
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Constraining the N₂O₅ UV absorption cross section from spectroscopic trace gas measurements in the tropical mid-stratosphere by L. Kritten, A. Butz, M. P. Chipperfield, M. Dorf, S. Dhomse, R. Hossaini, H. Oelhaf, C. Prados-Roman, G. Wetzel, K. Pfeilsticker

“…Our scaled N₂O₅ photolysis frequency slightly reduces the lifetime (0.2–0.6%) of ozone in the tropical mid- and upper stratosphere, but not to an extent to be important for global ozone.…”
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Investigating the global OH radical distribution using steady-state approximations and satellite data by M. A. Pimlott, R. J. Pope, R. J. Pope, B. J. Kerridge, B. J. Kerridge, B. G. Latter, B. G. Latter, D. S. Knappett, D. S. Knappett, D. E. Heard, L. J. Ventress, L. J. Ventress, R. Siddans, R. Siddans, W. Feng, W. Feng, M. P. Chipperfield, M. P. Chipperfield

“…In the case of a simplified SSA (S-SSA), where we have observations of ozone (O<span class="inline-formula">₃)</span>, carbon monoxide (CO), CH<span class="inline-formula">₄</span> and water vapour (H<span class="inline-formula">₂</span>O) from the Infrared Atmospheric Sounding Interferometer (IASI) on board ESA's MetOp-A satellite, it is most representative of OH between 600 and 700 hPa (though suitable between 400–800 hPa) within <span class="inline-formula">∼20</span> %–30 % of TOMCAT modelled OH. …”
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