Articles | Volume 12, issue 3
https://doi.org/10.5194/gmd-12-1227-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-12-1227-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions
National Institute of Water and Atmospheric Research, Wellington, New Zealand
now at: CSIRO Oceans and Atmosphere, Aspendale, Australia
James Keeble
Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Cambridge, UK
National Centre for Atmospheric Science, UK
Olaf Morgenstern
National Institute of Water and Atmospheric Research, Wellington, New Zealand
Guang Zeng
National Institute of Water and Atmospheric Research, Wellington, New Zealand
N. Luke Abraham
Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Cambridge, UK
National Centre for Atmospheric Science, UK
British Antarctic Survey, Cambridge, UK
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Marielle Saunois, Adrien Martinez, Benjamin Poulter, Zhen Zhang, Peter A. Raymond, Pierre Regnier, Josep G. Canadell, Robert B. Jackson, Prabir K. Patra, Philippe Bousquet, Philippe Ciais, Edward J. Dlugokencky, Xin Lan, George H. Allen, David Bastviken, David J. Beerling, Dmitry A. Belikov, Donald R. Blake, Simona Castaldi, Monica Crippa, Bridget R. Deemer, Fraser Dennison, Giuseppe Etiope, Nicola Gedney, Lena Höglund-Isaksson, Meredith A. Holgerson, Peter O. Hopcroft, Gustaf Hugelius, Akihiko Ito, Atul K. Jain, Rajesh Janardanan, Matthew S. Johnson, Thomas Kleinen, Paul B. Krummel, Ronny Lauerwald, Tingting Li, Xiangyu Liu, Kyle C. McDonald, Joe R. Melton, Jens Mühle, Jurek Müller, Fabiola Murguia-Flores, Yosuke Niwa, Sergio Noce, Shufen Pan, Robert J. Parker, Changhui Peng, Michel Ramonet, William J. Riley, Gerard Rocher-Ros, Judith A. Rosentreter, Motoki Sasakawa, Arjo Segers, Steven J. Smith, Emily H. Stanley, Joël Thanwerdas, Hanqin Tian, Aki Tsuruta, Francesco N. Tubiello, Thomas S. Weber, Guido R. van der Werf, Douglas E. J. Worthy, Yi Xi, Yukio Yoshida, Wenxin Zhang, Bo Zheng, Qing Zhu, Qiuan Zhu, and Qianlai Zhuang
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Olaf Morgenstern
Atmos. Chem. Phys., 24, 8105–8123, https://doi.org/10.5194/acp-24-8105-2024, https://doi.org/10.5194/acp-24-8105-2024, 2024
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Guang Zeng, Richard Querel, Hisako Shiona, Deniz Poyraz, Roeland Van Malderen, Alex Geddes, Penny Smale, Dan Smale, John Robinson, and Olaf Morgenstern
Atmos. Chem. Phys., 24, 6413–6432, https://doi.org/10.5194/acp-24-6413-2024, https://doi.org/10.5194/acp-24-6413-2024, 2024
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Xin Yang, Kimberly Strong, Alison S. Criscitiello, Marta Santos-Garcia, Kristof Bognar, Xiaoyi Zhao, Pierre Fogal, Kaley A. Walker, Sara M. Morris, and Peter Effertz
Atmos. Chem. Phys., 24, 5863–5886, https://doi.org/10.5194/acp-24-5863-2024, https://doi.org/10.5194/acp-24-5863-2024, 2024
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This study uses snow samples collected from a Canadian high Arctic site, Eureka, to demonstrate that surface snow in early spring is a net sink of atmospheric bromine and nitrogen. Surface snow bromide and nitrate are significantly correlated, indicating the oxidation of reactive nitrogen is accelerated by reactive bromine. In addition, we show evidence that snow photochemical release of reactive bromine is very weak, and its emission flux is much smaller than the deposition flux of bromide.
Ben A. Cala, Scott Archer-Nicholls, James Weber, N. Luke Abraham, Paul T. Griffiths, Lorrie Jacob, Y. Matthew Shin, Laura E. Revell, Matthew Woodhouse, and Alexander T. Archibald
Atmos. Chem. Phys., 23, 14735–14760, https://doi.org/10.5194/acp-23-14735-2023, https://doi.org/10.5194/acp-23-14735-2023, 2023
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Dimethyl sulfide (DMS) is an important trace gas emitted from the ocean recognised as setting the sulfate aerosol background, but its oxidation is complex. As a result representation in chemistry-climate models is greatly simplified. We develop and compare a new mechanism to existing mechanisms via a series of global and box model experiments. Our studies show our updated DMS scheme is a significant improvement but significant variance exists between mechanisms.
Ewa M. Bednarz, Ryan Hossaini, N. Luke Abraham, and Martyn P. Chipperfield
Geosci. Model Dev., 16, 6187–6209, https://doi.org/10.5194/gmd-16-6187-2023, https://doi.org/10.5194/gmd-16-6187-2023, 2023
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Development and performance of the new DEST chemistry scheme of UM–UKCA is described. The scheme extends the standard StratTrop scheme by including important updates to the halogen chemistry, thus allowing process-oriented studies of stratospheric ozone depletion and recovery, including impacts from both controlled long-lived ozone-depleting substances and emerging issues around uncontrolled, very short-lived substances. It will thus aid studies in support of future ozone assessment reports.
Nicola J. Warwick, Alex T. Archibald, Paul T. Griffiths, James Keeble, Fiona M. O'Connor, John A. Pyle, and Keith P. Shine
Atmos. Chem. Phys., 23, 13451–13467, https://doi.org/10.5194/acp-23-13451-2023, https://doi.org/10.5194/acp-23-13451-2023, 2023
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A chemistry–climate model has been used to explore the atmospheric response to changes in emissions of hydrogen and other species associated with a shift from fossil fuel to hydrogen use. Leakage of hydrogen results in indirect global warming, offsetting greenhouse gas emission reductions from reduced fossil fuel use. To maximise the benefit of hydrogen as an energy source, hydrogen leakage and emissions of methane, carbon monoxide and nitrogen oxides should be minimised.
Marina Friedel, Gabriel Chiodo, Timofei Sukhodolov, James Keeble, Thomas Peter, Svenja Seeber, Andrea Stenke, Hideharu Akiyoshi, Eugene Rozanov, David Plummer, Patrick Jöckel, Guang Zeng, Olaf Morgenstern, and Béatrice Josse
Atmos. Chem. Phys., 23, 10235–10254, https://doi.org/10.5194/acp-23-10235-2023, https://doi.org/10.5194/acp-23-10235-2023, 2023
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Previously, it has been suggested that springtime Arctic ozone depletion might worsen in the coming decades due to climate change, which might counteract the effect of reduced ozone-depleting substances. Here, we show with different chemistry–climate models that springtime Arctic ozone depletion will likely decrease in the future. Further, we explain why models show a large spread in the projected development of Arctic ozone depletion and use the model spread to constrain future projections.
Laura J. Wilcox, Robert J. Allen, Bjørn H. Samset, Massimo A. Bollasina, Paul T. Griffiths, James Keeble, Marianne T. Lund, Risto Makkonen, Joonas Merikanto, Declan O'Donnell, David J. Paynter, Geeta G. Persad, Steven T. Rumbold, Toshihiko Takemura, Kostas Tsigaridis, Sabine Undorf, and Daniel M. Westervelt
Geosci. Model Dev., 16, 4451–4479, https://doi.org/10.5194/gmd-16-4451-2023, https://doi.org/10.5194/gmd-16-4451-2023, 2023
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Changes in anthropogenic aerosol emissions have strongly contributed to global and regional climate change. However, the size of these regional impacts and the way they arise are still uncertain. With large changes in aerosol emissions a possibility over the next few decades, it is important to better quantify the potential role of aerosol in future regional climate change. The Regional Aerosol Model Intercomparison Project will deliver experiments designed to facilitate this.
Jonny Williams, Erik Behrens, Olaf Morgenstern, Peter Gibson, and Joao Teixeira
EGUsphere, https://doi.org/10.5194/egusphere-2023-1694, https://doi.org/10.5194/egusphere-2023-1694, 2023
Preprint withdrawn
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We use open-source cyclone tracking software and state-of-the-art climate models to characterise present-day tropical cyclones – TCs – in the South Pacific before moving on to estimate how they may change in the future. A robust result of this work is the projection of future intensification of TCs. However, the question of their future occurrence frequency is less clear. Under extreme future warming scenarios, we postulate a possible increase in power dissipation per TC of up to 25 %.
Maria Rosa Russo, Brian John Kerridge, Nathan Luke Abraham, James Keeble, Barry Graham Latter, Richard Siddans, James Weber, Paul Thomas Griffiths, John Adrian Pyle, and Alexander Thomas Archibald
Atmos. Chem. Phys., 23, 6169–6196, https://doi.org/10.5194/acp-23-6169-2023, https://doi.org/10.5194/acp-23-6169-2023, 2023
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Tropospheric ozone is an important component of the Earth system as it can affect both climate and air quality. In this work we use observed tropospheric ozone derived from satellite observations and compare it to tropospheric ozone from model simulations. Our aim is to investigate recent changes (2005–2018) in tropospheric ozone in the North Atlantic region and to understand what factors are driving such changes.
Scott Archer-Nicholls, Rachel Allen, Nathan L. Abraham, Paul T. Griffiths, and Alex T. Archibald
Atmos. Chem. Phys., 23, 5801–5813, https://doi.org/10.5194/acp-23-5801-2023, https://doi.org/10.5194/acp-23-5801-2023, 2023
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The nitrate radical is a major oxidant at nighttime, but much less is known about it than about the other oxidants ozone and OH. We use Earth system model calculations to show how the nitrate radical has changed in abundance from 1850–2014 and to 2100 under a range of different climate and emission scenarios. Depending on the emissions and climate scenario, significant increases are projected with implications for the oxidation of volatile organic compounds and the formation of fine aerosol.
Lubica Vetráková, Vilém Neděla, Kamila Závacká, Xin Yang, and Dominik Heger
Atmos. Chem. Phys., 23, 4463–4488, https://doi.org/10.5194/acp-23-4463-2023, https://doi.org/10.5194/acp-23-4463-2023, 2023
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Salt aerosols are important to polar atmospheric chemistry and global climate. Therefore, we utilized a unique electron microscope to identify the most suitable conditions for formation of the small salt (CsCl) particles, proxies of the aerosols, from sublimating salty snow. Very low sublimation temperature and low salt concentration are needed for formation of such particles. These observations may help us to better understand polar spring ozone depletion and bromine explosion events.
Fouzia Fahrin, Daniel C. Jones, Yan Wu, James Keeble, and Alexander T. Archibald
Atmos. Chem. Phys., 23, 3609–3627, https://doi.org/10.5194/acp-23-3609-2023, https://doi.org/10.5194/acp-23-3609-2023, 2023
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We use a machine learning technique called Gaussian mixture modeling (GMM) to classify vertical ozone profiles into groups based on how the ozone concentration changes with pressure. Even though the GMM algorithm was not provided with spatial information, the classes are geographically coherent. We also detect signatures of tropical broadening in UKESM1 future climate scenarios. GMM may be useful for understanding ozone structures in modeled and observed datasets.
Xin Yang, Kimberly Strong, Alison S. Criscitiello, Marta Santos-Garcia, Kristof Bognar, Xiaoyi Zhao, Pierre Fogal, Kaley A. Walker, Sara M. Morris, and Peter Effertz
EGUsphere, https://doi.org/10.5194/egusphere-2022-696, https://doi.org/10.5194/egusphere-2022-696, 2022
Preprint archived
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Snow pack in high Arctic plays a key role in polar atmospheric chemistry, especially in spring when photochemistry becomes active. By sampling surface snow from a Canadian high Arctic location at Eureka, Nunavut (80° N, 86° W), we demonstrate that surface snow is a net sink rather than a source of atmospheric reactive bromine and nitrate. This finding is new and opposite to previous conclusions that snowpack is a large and direct source of reactive bromine in polar spring.
Flossie Brown, Gerd A. Folberth, Stephen Sitch, Susanne Bauer, Marijn Bauters, Pascal Boeckx, Alexander W. Cheesman, Makoto Deushi, Inês Dos Santos Vieira, Corinne Galy-Lacaux, James Haywood, James Keeble, Lina M. Mercado, Fiona M. O'Connor, Naga Oshima, Kostas Tsigaridis, and Hans Verbeeck
Atmos. Chem. Phys., 22, 12331–12352, https://doi.org/10.5194/acp-22-12331-2022, https://doi.org/10.5194/acp-22-12331-2022, 2022
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Surface ozone can decrease plant productivity and impair human health. In this study, we evaluate the change in surface ozone due to climate change over South America and Africa using Earth system models. We find that if the climate were to change according to the worst-case scenario used here, models predict that forested areas in biomass burning locations and urban populations will be at increasing risk of ozone exposure, but other areas will experience a climate benefit.
Ewa M. Bednarz, Ryan Hossaini, Martyn P. Chipperfield, N. Luke Abraham, and Peter Braesicke
Atmos. Chem. Phys., 22, 10657–10676, https://doi.org/10.5194/acp-22-10657-2022, https://doi.org/10.5194/acp-22-10657-2022, 2022
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Atmospheric impacts of chlorinated very short-lived substances (Cl-VSLS) over the first two decades of the 21st century are assessed using the UM-UKCA chemistry–climate model. Stratospheric input of Cl from Cl-VSLS is estimated at ~130 ppt in 2019. The use of model set-up with constrained meteorology significantly increases the abundance of Cl-VSLS in the lower stratosphere relative to the free-running set-up. The growth in Cl-VSLS emissions significantly impacted recent HCl and COCl2 trends.
Ľubica Vetráková, Vilém Neděla, Jiří Runštuk, Xin Yang, and Dominik Heger
The Cryosphere Discuss., https://doi.org/10.5194/tc-2021-376, https://doi.org/10.5194/tc-2021-376, 2022
Manuscript not accepted for further review
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In polar regions, sea salt aerosols are important to polar atmospheric chemistry, yet their mechanism of formation is not well understood. We inspected the sublimation residues of salty ices in a unique electron microscope and sought for small salt particles, proxies of sea salt aerosols. Our experiments showed that aerosolizable salt particles are preferably generated from low-concentrated ices and at low temperatures. This condition favors salty snow as an efficient source of the aerosols.
Anthony C. Jones, Adrian Hill, Samuel Remy, N. Luke Abraham, Mohit Dalvi, Catherine Hardacre, Alan J. Hewitt, Ben Johnson, Jane P. Mulcahy, and Steven T. Turnock
Atmos. Chem. Phys., 21, 15901–15927, https://doi.org/10.5194/acp-21-15901-2021, https://doi.org/10.5194/acp-21-15901-2021, 2021
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Ammonium nitrate is hard to model because it forms and evaporates rapidly. One approach is to relate its equilibrium concentration to temperature, humidity, and the amount of nitric acid and ammonia gases. Using this approach, we limit the rate at which equilibrium is reached using various condensation rates in a climate model. We show that ammonium nitrate concentrations are highly sensitive to the condensation rate. Our results will help improve the representation of nitrate in climate models.
James Weber, Scott Archer-Nicholls, Nathan Luke Abraham, Youngsub M. Shin, Thomas J. Bannan, Carl J. Percival, Asan Bacak, Paulo Artaxo, Michael Jenkin, M. Anwar H. Khan, Dudley E. Shallcross, Rebecca H. Schwantes, Jonathan Williams, and Alex T. Archibald
Geosci. Model Dev., 14, 5239–5268, https://doi.org/10.5194/gmd-14-5239-2021, https://doi.org/10.5194/gmd-14-5239-2021, 2021
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The new mechanism CRI-Strat 2 features state-of-the-art isoprene chemistry not previously available in UKCA and improves UKCA's ability to reproduce observed concentrations of isoprene, monoterpenes, and OH in tropical regions. The enhanced ability to model isoprene, the most widely emitted non-methane volatile organic compound (VOC), will allow understanding of how isoprene and other biogenic VOCs affect atmospheric composition and, through biosphere–atmosphere feedbacks, climate change.
John Staunton-Sykes, Thomas J. Aubry, Youngsub M. Shin, James Weber, Lauren R. Marshall, Nathan Luke Abraham, Alex Archibald, and Anja Schmidt
Atmos. Chem. Phys., 21, 9009–9029, https://doi.org/10.5194/acp-21-9009-2021, https://doi.org/10.5194/acp-21-9009-2021, 2021
Vidya Varma, Olaf Morgenstern, Kalli Furtado, Paul Field, and Jonny Williams
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-438, https://doi.org/10.5194/acp-2021-438, 2021
Revised manuscript not accepted
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We introduce a simple parametrisation whereby the immersion freezing temperature in the model is linked to the mineral dust distribution through a diagnostic function, thus invoking regional differences in the nucleation temperatures instead of the global default value of −10 °C. This provides a functionality to mimic the role of Ice Nucleating Particles in the atmosphere on influencing the short-wave radiation over the Southern Ocean region by impacting the cloud phase.
Ashok K. Luhar, Ian E. Galbally, Matthew T. Woodhouse, and Nathan Luke Abraham
Atmos. Chem. Phys., 21, 7053–7082, https://doi.org/10.5194/acp-21-7053-2021, https://doi.org/10.5194/acp-21-7053-2021, 2021
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Lightning-generated nitrogen oxides (LNOx) greatly influence tropospheric photochemistry. The most common parameterisation of lightning flash rate used to calculate LNOx in global composition models underestimates measurements over the ocean by a factor of 20–25. We formulate and validate an alternative parameterisation to remedy this problem. The new scheme causes an increase in the ozone burden by 8.5 % and the hydroxyl radical by 13 %, and these have implications for climate and air quality.
James Keeble, Birgit Hassler, Antara Banerjee, Ramiro Checa-Garcia, Gabriel Chiodo, Sean Davis, Veronika Eyring, Paul T. Griffiths, Olaf Morgenstern, Peer Nowack, Guang Zeng, Jiankai Zhang, Greg Bodeker, Susannah Burrows, Philip Cameron-Smith, David Cugnet, Christopher Danek, Makoto Deushi, Larry W. Horowitz, Anne Kubin, Lijuan Li, Gerrit Lohmann, Martine Michou, Michael J. Mills, Pierre Nabat, Dirk Olivié, Sungsu Park, Øyvind Seland, Jens Stoll, Karl-Hermann Wieners, and Tongwen Wu
Atmos. Chem. Phys., 21, 5015–5061, https://doi.org/10.5194/acp-21-5015-2021, https://doi.org/10.5194/acp-21-5015-2021, 2021
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Stratospheric ozone and water vapour are key components of the Earth system; changes to both have important impacts on global and regional climate. We evaluate changes to these species from 1850 to 2100 in the new generation of CMIP6 models. There is good agreement between the multi-model mean and observations, although there is substantial variation between the individual models. The future evolution of both ozone and water vapour is strongly dependent on the assumed future emissions scenario.
Ananth Ranjithkumar, Hamish Gordon, Christina Williamson, Andrew Rollins, Kirsty Pringle, Agnieszka Kupc, Nathan Luke Abraham, Charles Brock, and Ken Carslaw
Atmos. Chem. Phys., 21, 4979–5014, https://doi.org/10.5194/acp-21-4979-2021, https://doi.org/10.5194/acp-21-4979-2021, 2021
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The effect aerosols have on climate can be better understood by studying their vertical and spatial distribution throughout the atmosphere. We use observation data from the ATom campaign and evaluate the vertical profile of aerosol number concentration, sulfur dioxide and condensation sink using the UKESM (UK Earth System Model). We identify uncertainties in key atmospheric processes that help improve their theoretical representation in global climate models.
Paul T. Griffiths, Lee T. Murray, Guang Zeng, Youngsub Matthew Shin, N. Luke Abraham, Alexander T. Archibald, Makoto Deushi, Louisa K. Emmons, Ian E. Galbally, Birgit Hassler, Larry W. Horowitz, James Keeble, Jane Liu, Omid Moeini, Vaishali Naik, Fiona M. O'Connor, Naga Oshima, David Tarasick, Simone Tilmes, Steven T. Turnock, Oliver Wild, Paul J. Young, and Prodromos Zanis
Atmos. Chem. Phys., 21, 4187–4218, https://doi.org/10.5194/acp-21-4187-2021, https://doi.org/10.5194/acp-21-4187-2021, 2021
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We analyse the CMIP6 Historical and future simulations for tropospheric ozone, a species which is important for many aspects of atmospheric chemistry. We show that the current generation of models agrees well with observations, being particularly successful in capturing trends in surface ozone and its vertical distribution in the troposphere. We analyse the factors that control ozone and show that they evolve over the period of the CMIP6 experiments.
Chaim I. Garfinkel, Ohad Harari, Shlomi Ziskin Ziv, Jian Rao, Olaf Morgenstern, Guang Zeng, Simone Tilmes, Douglas Kinnison, Fiona M. O'Connor, Neal Butchart, Makoto Deushi, Patrick Jöckel, Andrea Pozzer, and Sean Davis
Atmos. Chem. Phys., 21, 3725–3740, https://doi.org/10.5194/acp-21-3725-2021, https://doi.org/10.5194/acp-21-3725-2021, 2021
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Water vapor is the dominant greenhouse gas in the atmosphere, and El Niño is the dominant mode of variability in the ocean–atmosphere system. The connection between El Niño and water vapor above ~ 17 km is unclear, with single-model studies reaching a range of conclusions. This study examines this connection in 12 different models. While there are substantial differences among the models, all models appear to capture the fundamental physical processes correctly.
Peter Sherman, Meng Gao, Shaojie Song, Alex T. Archibald, Nathan Luke Abraham, Jean-François Lamarque, Drew Shindell, Gregory Faluvegi, and Michael B. McElroy
Atmos. Chem. Phys., 21, 3593–3605, https://doi.org/10.5194/acp-21-3593-2021, https://doi.org/10.5194/acp-21-3593-2021, 2021
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The aims here are to assess the role of aerosols in India's monsoon precipitation and to determine the relative contributions from Chinese and Indian emissions using CMIP6 models. We find that increased sulfur emissions reduce precipitation, which is primarily dynamically driven due to spatial shifts in convection over the region. A significant increase in precipitation (up to ~ 20 %) is found only when both Indian and Chinese sulfate emissions are regulated.
Fiona M. O'Connor, N. Luke Abraham, Mohit Dalvi, Gerd A. Folberth, Paul T. Griffiths, Catherine Hardacre, Ben T. Johnson, Ron Kahana, James Keeble, Byeonghyeon Kim, Olaf Morgenstern, Jane P. Mulcahy, Mark Richardson, Eddy Robertson, Jeongbyn Seo, Sungbo Shim, João C. Teixeira, Steven T. Turnock, Jonny Williams, Andrew J. Wiltshire, Stephanie Woodward, and Guang Zeng
Atmos. Chem. Phys., 21, 1211–1243, https://doi.org/10.5194/acp-21-1211-2021, https://doi.org/10.5194/acp-21-1211-2021, 2021
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This paper calculates how changes in emissions and/or concentrations of different atmospheric constituents since the pre-industrial era have altered the Earth's energy budget at the present day using a metric called effective radiative forcing. The impact of land use change is also assessed. We find that individual contributions do not add linearly, and different Earth system interactions can affect the magnitude of the calculated effective radiative forcing.
Gillian D. Thornhill, William J. Collins, Ryan J. Kramer, Dirk Olivié, Ragnhild B. Skeie, Fiona M. O'Connor, Nathan Luke Abraham, Ramiro Checa-Garcia, Susanne E. Bauer, Makoto Deushi, Louisa K. Emmons, Piers M. Forster, Larry W. Horowitz, Ben Johnson, James Keeble, Jean-Francois Lamarque, Martine Michou, Michael J. Mills, Jane P. Mulcahy, Gunnar Myhre, Pierre Nabat, Vaishali Naik, Naga Oshima, Michael Schulz, Christopher J. Smith, Toshihiko Takemura, Simone Tilmes, Tongwen Wu, Guang Zeng, and Jie Zhang
Atmos. Chem. Phys., 21, 853–874, https://doi.org/10.5194/acp-21-853-2021, https://doi.org/10.5194/acp-21-853-2021, 2021
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This paper is a study of how different constituents in the atmosphere, such as aerosols and gases like methane and ozone, affect the energy balance in the atmosphere. Different climate models were run using the same inputs to allow an easy comparison of the results and to understand where the models differ. We found the effect of aerosols is to reduce warming in the atmosphere, but this effect varies between models. Reactions between gases are also important in affecting climate.
Peter Kuma, Adrian J. McDonald, Olaf Morgenstern, Richard Querel, Israel Silber, and Connor J. Flynn
Geosci. Model Dev., 14, 43–72, https://doi.org/10.5194/gmd-14-43-2021, https://doi.org/10.5194/gmd-14-43-2021, 2021
Xin Yang, Anne-M. Blechschmidt, Kristof Bognar, Audra McClure-Begley, Sara Morris, Irina Petropavlovskikh, Andreas Richter, Henrik Skov, Kimberly Strong, David W. Tarasick, Taneil Uttal, Mika Vestenius, and Xiaoyi Zhao
Atmos. Chem. Phys., 20, 15937–15967, https://doi.org/10.5194/acp-20-15937-2020, https://doi.org/10.5194/acp-20-15937-2020, 2020
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This is a modelling-based study on Arctic surface ozone, with a particular focus on spring ozone depletion events (i.e. with concentrations < 10 ppbv). Model experiments show that model runs with blowing-snow-sourced sea salt aerosols implemented as a source of reactive bromine can reproduce well large-scale ozone depletion events observed in the Arctic. This study supplies modelling evidence of the proposed mechanism of reactive-bromine release from blowing snow on sea ice (Yang et al., 2008).
Jane P. Mulcahy, Colin Johnson, Colin G. Jones, Adam C. Povey, Catherine E. Scott, Alistair Sellar, Steven T. Turnock, Matthew T. Woodhouse, Nathan Luke Abraham, Martin B. Andrews, Nicolas Bellouin, Jo Browse, Ken S. Carslaw, Mohit Dalvi, Gerd A. Folberth, Matthew Glover, Daniel P. Grosvenor, Catherine Hardacre, Richard Hill, Ben Johnson, Andy Jones, Zak Kipling, Graham Mann, James Mollard, Fiona M. O'Connor, Julien Palmiéri, Carly Reddington, Steven T. Rumbold, Mark Richardson, Nick A. J. Schutgens, Philip Stier, Marc Stringer, Yongming Tang, Jeremy Walton, Stephanie Woodward, and Andrew Yool
Geosci. Model Dev., 13, 6383–6423, https://doi.org/10.5194/gmd-13-6383-2020, https://doi.org/10.5194/gmd-13-6383-2020, 2020
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Aerosols are an important component of the Earth system. Here, we comprehensively document and evaluate the aerosol schemes as implemented in the physical and Earth system models, HadGEM3-GC3.1 and UKESM1. This study provides a useful characterisation of the aerosol climatology in both models, facilitating the understanding of the numerous aerosol–climate interaction studies that will be conducted for CMIP6 and beyond.
Sandip S. Dhomse, Graham W. Mann, Juan Carlos Antuña Marrero, Sarah E. Shallcross, Martyn P. Chipperfield, Kenneth S. Carslaw, Lauren Marshall, N. Luke Abraham, and Colin E. Johnson
Atmos. Chem. Phys., 20, 13627–13654, https://doi.org/10.5194/acp-20-13627-2020, https://doi.org/10.5194/acp-20-13627-2020, 2020
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We confirm downward adjustment of SO2 emission to simulate the Pinatubo aerosol cloud with aerosol microphysics models. Similar adjustment is also needed to simulate the El Chichón and Agung volcanic cloud, indicating potential missing removal or vertical redistribution process in models. Important inhomogeneities in the CMIP6 forcing datasets after Agung and El Chichón eruptions are difficult to reconcile. Quasi-biennial oscillation plays an important role in modifying stratospheric warming.
David S. Stevenson, Alcide Zhao, Vaishali Naik, Fiona M. O'Connor, Simone Tilmes, Guang Zeng, Lee T. Murray, William J. Collins, Paul T. Griffiths, Sungbo Shim, Larry W. Horowitz, Lori T. Sentman, and Louisa Emmons
Atmos. Chem. Phys., 20, 12905–12920, https://doi.org/10.5194/acp-20-12905-2020, https://doi.org/10.5194/acp-20-12905-2020, 2020
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We present historical trends in atmospheric oxidizing capacity (OC) since 1850 from the latest generation of global climate models and compare these with estimates from measurements. OC controls levels of many key reactive gases, including methane (CH4). We find small model trends up to 1980, then increases of about 9 % up to 2014, disagreeing with (uncertain) measurement-based trends. Major drivers of OC trends are emissions of CH4, NOx, and CO; these will be important for future CH4 trends.
Andrew Orr, J. Scott Hosking, Aymeric Delon, Lars Hoffmann, Reinhold Spang, Tracy Moffat-Griffin, James Keeble, Nathan Luke Abraham, and Peter Braesicke
Atmos. Chem. Phys., 20, 12483–12497, https://doi.org/10.5194/acp-20-12483-2020, https://doi.org/10.5194/acp-20-12483-2020, 2020
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Polar stratospheric clouds (PSCs) are clouds found in the Antarctic winter stratosphere and are implicated in the formation of the ozone hole. These clouds can sometimes be formed or enhanced by mountain waves, formed as air passes over hills or mountains. However, this important mechanism is missing in coarse-resolution climate models, limiting our ability to simulate ozone. This study examines an attempt to include the effects of mountain waves and their impact on PSCs and ozone.
Matt Amos, Paul J. Young, J. Scott Hosking, Jean-François Lamarque, N. Luke Abraham, Hideharu Akiyoshi, Alexander T. Archibald, Slimane Bekki, Makoto Deushi, Patrick Jöckel, Douglas Kinnison, Ole Kirner, Markus Kunze, Marion Marchand, David A. Plummer, David Saint-Martin, Kengo Sudo, Simone Tilmes, and Yousuke Yamashita
Atmos. Chem. Phys., 20, 9961–9977, https://doi.org/10.5194/acp-20-9961-2020, https://doi.org/10.5194/acp-20-9961-2020, 2020
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We present an updated projection of Antarctic ozone hole recovery using an ensemble of chemistry–climate models. To do so, we employ a method, more advanced and skilful than the current multi-model mean standard, which is applicable to other ensemble analyses. It calculates the performance and similarity of the models, which we then use to weight the model. Calculating model similarity allows us to account for models which are constructed from similar components.
Cited articles
Angell, J. K.: On the Relation between Atmospheric Ozone and Sunspot
Number, J. Climate, 2, 1404–1416,
https://doi.org/10.1175/1520-0442(1989)002<1404:OTRBAO>2.0.CO;2, 1989. a
Bednarz, E. M., Maycock, A. C., Telford, P. J., Braesicke, P., Abraham, N.
L., and Pyle, J. A.: Simulating the atmospheric response to the 11-year solar
cycle forcing with the UM-UKCA model: the role of detection method and
natural variability, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-129,
in review, 2018. a, b, c, d, e
Braesicke, P., Keeble, J., Yang, X., Stiller, G., Kellmann, S., Abraham, N.
L., Archibald, A., Telford, P., and Pyle, J. A.: Circulation anomalies in the
Southern Hemisphere and ozone changes, Atmos. Chem. Phys., 13, 10677–10688,
https://doi.org/10.5194/acp-13-10677-2013, 2013. a
Burkholder, J. B., Sander, S. P., Abbatt, J. P. D., Barker, J. R., Huie,
R. E., Kolb, C. E., Kurylo, M. J., Orkin, V. L., Wilmouth, D. M., and Wine,
P. H.: Chemical Kinetics and Photochemical Data for Use in Atmospheric
Studies Evaluation Number 18, Tech. rep., Jet Propulsion Laboratory,
Pasadena, California, available at: http://jpldataeval.jpl.nasa.gov/
(last access: 19 April 2018), 2015. a, b, c
Calisesi, Y. and Matthes, K.: The middle atmospheric ozone response to the
11-year solar cycle, Space Sci. Rev., 125, 273–286,
https://doi.org/10.1007/s11214-006-9063-4, 2006. a, b
Chipperfield, M. P., Bekki, S., Dhomse, S., Harris, N. R. P., Hassler, B.,
Hossaini, R., Steinbrecht, W., Thiéblemont, R., and Weber, M.:
Detecting recovery of the stratospheric ozone layer, Nature, 549, 211–218,
https://doi.org/10.1038/nature23681, 2017. a
Cox, R. A., MacKenzie, A. R., Muller, R. H., Peter, T., and Crutzen, P. J.:
Activation of stratospheric chlorine by reactions in liquid sulphuric acid,
Geophys. Res. Lett., 22, 1439–1442, https://doi.org/10.1029/93GL03073, 1994. a
Crowley, J. N., Ammann, M., Cox, R. A., Hynes, R. G., Jenkin, M. E.,
Mellouki, A., Rossi, M. J., Troe, J., and Wallington, T. J.: Evaluated
kinetic and photochemical data for atmospheric chemistry: Volume V –
heterogeneous reactions on solid substrates, Atmos. Chem. Phys., 10,
9059–9223, https://doi.org/10.5194/acp-10-9059-2010, 2010. a, b
Crutzen, P. J.: Estimates of possible future ozone reductions from continued
use of fluoro-chloro-methanes (CF2Cl2, CFCl3), Geophys. Res. Lett., 1,
205–208, https://doi.org/10.1029/GL001i005p00205, 1974. a
Dameris, M., Matthes, S., Deckert, R., Grewe, V., and Ponater, M.: Solar
cycle effect delays onset of ozone recovery, Geophys. Res. Lett., 33,
L03806, https://doi.org/10.1029/2005GL024741, 2006. a
Daniel, J. S., Velders, G. J. M., Douglass, A., Forster, P., Hauglustaine,
D., Isaksen, I., Kuijpers, L., McCulloch, A., and Wallington, T.: Halocarbon
Scenarios, Ozone Depletion Potentials, and Global Warming Potentials, chap. 8
in: Scientific assessment of ozone depletion: 2006, Global Ozone Research and
Monitoring Project – Report No. 50, Tech. rep., World Meteorological
Organization, Geneva, 2007. a
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P.,
Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P.,
Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N.,
Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy,
S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P.,
Köhler, M., Matricardi, M., Mcnally, A. P., Monge-Sanz, B. M.,
Morcrette, J. J., Park, B. K., Peubey, C., de Rosnay, P., Tavolato, C.,
Thépaut, J. N., and Vitart, F.: The ERA-Interim reanalysis:
Configuration and performance of the data assimilation system, Q. J. Roy.
Meteor. Soc., 137, 553–597, https://doi.org/10.1002/qj.828, 2011. a
Dennison, F., Keeble, J., Morgenstern, O., Zeng, G., Abraham, N. L., and
Yang, X.: Improvements to stratospheric chemistry scheme in the UM-UKCA
(v10.7) model: solar cycle and heterogeneous reactions [Data set], Zenodo,
https://doi.org/10.5281/zenodo.1486305, 2018. a
Dennison, F. W., McDonald, A., and Morgenstern, O.: The Influence of Ozone
Forcing on Blocking in the Southern Hemisphere, J. Geophys. Res.-Atmos.,
121, 14358–14371, https://doi.org/10.1002/2016JD025033, 2016. a
Dennison, F. W., McDonald, A. J., and Morgenstern, O.: The effect of ozone
depletion on the Southern Annular Mode and stratosphere–troposphere
coupling, J. Geophys. Res.-Atmos., 120, 6305–6312,
https://doi.org/10.1002/2014JD023009, 2015. a
Egorova, T., Rozanov, E., Zubov, V., Schmutz, W., and Peter, T.: Influence
of solar 11-year variability on chemical composition of the stratosphere and
mesosphere simulated with a chemistry-climate model, Adv. Space Res., 35,
451–457, https://doi.org/10.1016/j.asr.2005.01.048, 2005. a
Esentürk, E., Abraham, N. L., Archer-Nicholls, S., Mitsakou, C.,
Griffiths, P., Archibald, A., and Pyle, J.: Quasi-Newton methods for
atmospheric chemistry simulations: implementation in UKCA UM vn10.8, Geosci.
Model Dev., 11, 3089–3108, https://doi.org/10.5194/gmd-11-3089-2018, 2018. a
Gillett, N. P., Kell, T. D., and Jones, P. D.: Regional climate impacts of
the Southern Annular Mode, Geophys. Res. Lett., 33, L23704,
https://doi.org/10.1029/2006GL027721, 2006. a
Haigh, J. D. and Roscoe, H. K.: The final warming date of the Antarctic
polar vortex and influences on its interannual variability, J. Climate, 22,
5809–5819, https://doi.org/10.1175/2009JCLI2865.1, 2009. a
Hall, A. and Visbeck, M.: Synchronous variability in the Southern Hemisphere
atmosphere, sea ice, and ocean resulting from the annular mode, J. Climate,
15, 3043–3057, https://doi.org/10.1175/1520-0442(2002)015<3043:SVITSH>2.0.CO;2, 2002. a
Hamill, P., Tabazadeh, A., Kinne, S., Toon, O. B., and Turco, R. P.: On the
growth of ternary system HNO3/H2SO4/H2O aerosol particles in the
stratosphere, Geophys. Res. Lett., 23, 753–756, 1996. a
Hanson, D. R.: Reactivity of BrONO2 and HOBr on sulfuric acid solutions at
low temperatures, J. Geophys. Res., 108, 4239, https://doi.org/10.1029/2002JD002519,
2003. a
Hanson, D. R. and Mauersberger, K.: Laboratory studies of the nitric acid
trihydrate: Implications for the south polar stratosphere, Geophys. Res.
Lett., 15, 855–858, https://doi.org/10.1029/GL015i008p00855, 1988. a, b
Hanson, D. R. and Ravishankara, A. R.: Heterogeneous chemistry of bromine
species in sulfuric acid under stratospheric conditions, Geophys. Res.
Lett., 22, 385–388, 1995. a
Hanson, D. R., Ravishankara, A. R., and Lovejoy, E. R.: Reaction of BrONO2
with H2O on submicron sulfuric acid aerosol and the implications for
the lower stratosphere, J. Geophys. Res., 101, 9063–9069,
https://doi.org/10.1029/96JD00347, 1996. a, b
Ivy, D. J., Solomon, S., Calvo, N., and Thompson, D. W.: Observed
connections of Arctic stratospheric ozone extremes to Northern Hemisphere
surface climate, Environ. Res. Lett., 12, 024004,
https://doi.org/10.1088/1748-9326/aa57a4, 2017. a
Jöckel, P., Tost, H., Pozzer, A., Brühl, C., Buchholz, J., Ganzeveld,
L., Hoor, P., Kerkweg, A., Lawrence, M. G., Sander, R., Steil, B., Stiller,
G., Tanarhte, M., Taraborrelli, D., van Aardenne, J., and Lelieveld, J.: The
atmospheric chemistry general circulation model ECHAM5/MESSy1: consistent
simulation of ozone from the surface to the mesosphere, Atmos. Chem. Phys.,
6, 5067–5104, https://doi.org/10.5194/acp-6-5067-2006, 2006. a
Keeble, J., Braesicke, P., Abraham, N. L., Roscoe, H. K., and Pyle, J. A.:
The impact of polar stratospheric ozone loss on Southern Hemisphere
stratospheric circulation and climate, Atmos. Chem. Phys., 14, 13705–13717,
https://doi.org/10.5194/acp-14-13705-2014, 2014. a, b
Keeble, J., Brown, H., Abraham, N. L., Harris, N. R. P., and Pyle, J. A.: On
ozone trend detection: using coupled chemistry–climate simulations to
investigate early signs of total column ozone recovery, Atmos. Chem. Phys.,
18, 7625–7637, https://doi.org/10.5194/acp-18-7625-2018, 2018. a, b
Kodera, K.: The role of dynamics in solar forcing, Space Science Reviews,
125, 319–330, https://doi.org/10.1007/s11214-006-9066-1, 2006. a
Kuroda, Y., Yamazaki, K., and Shibata, K.: Role of ozone in the solar cycle
modulation of the North Atlantic Oscillation, J. Geophys. Res., 113, D14122,
https://doi.org/10.1029/2007JD009336, 2008. a
Labitzke, K., Austin, J., Butchart, N., Knight, J., Takahashi, M., Nakamoto,
M., Nagashima, T., Haigh, J., and Williams, V.: The global signal of the
11-year solar cycle in the stratosphere: Observations and models, J. Atmos.
Sol.-Terr. Phy., 64, 203–210, https://doi.org/10.1016/S1364-6826(01)00084-0, 2002. a
Langematz, U., Grenfell, J. L., Matthes, K., Mieth, P., Kunze, M., Steil, B.,
and Brühl, C.: Chemical effects in 11-year solar cycle simulations
with the Freie Universität Berlin Climate Middle Atmosphere Model with
online chemistry (FUB-CMAM-CHEM), Geophys. Res. Lett., 32, L13803,
https://doi.org/10.1029/2005GL022686, 2005. a
Lary, D. J. and Pyle, J. A.: Diffuse radiation, twilight, and photochemistry
– II, J. Atmos. Chem., 13, 393–406, https://doi.org/10.1007/BF00057754, 1991. a
Lean, J., Rottman, G., Harder, J., and Kopp, G.: SORCE Contributions to New
Understanding of Global Change and Solar Variability, Sol. Phys., 230,
27–53, https://doi.org/10.1007/0-387-37625-9_3, 2005. a, b, c
Marshall, G. J.: Half-century seasonal relationships between the Southern
Annular Mode and Antarctic temperatures, Int. J. Climatol., 27, 373–383,
https://doi.org/10.1002/joc.1407, 2007. a
Masui, T., Matsumoto, K., Hijioka, Y., Kinoshita, T., Nozawa, T., Ishiwatari,
S., Kato, E., Shukla, P. R., Yamagata, Y., and Kainuma, M.: An emission
pathway for stabilization at 6 W m−2 radiative forcing, Climatic
Change, 109, 59–76, https://doi.org/10.1007/s10584-011-0150-5, 2011. a
Maycock, A. C., Matthes, K., Tegtmeier, S., Thiéblemont, R., and Hood,
L.: The representation of solar cycle signals in stratospheric ozone –
Part 1: A comparison of recently updated satellite observations, Atmos. Chem.
Phys., 16, 10021–10043, https://doi.org/10.5194/acp-16-10021-2016, 2016. a
Maycock, A. C., Matthes, K., Tegtmeier, S., Schmidt, H., Thiéblemont, R.,
Hood, L., Akiyoshi, H., Bekki, S., Deushi, M., Jöckel, P., Kirner, O.,
Kunze, M., Marchand, M., Marsh, D. R., Michou, M., Plummer, D., Revell, L.
E., Rozanov, E., Stenke, A., Yamashita, Y., and Yoshida, K.: The
representation of solar cycle signals in stratospheric ozone – Part 2:
Analysis of global models, Atmos. Chem. Phys., 18, 11323–11343,
https://doi.org/10.5194/acp-18-11323-2018, 2018. a
McGrath, M. P., Clemitshaw, K. C., Rowland, F. S., and Hehre, W. J.:
Structures, relative stabilities, and vibrational spectra of isomers of
chlorine oxide dimer (Cl2O2): the role of the chlorine oxide dimer in
antarctic ozone depleting mechanisms, J. Phys. Chem., 94, 6126–6132, 1990. a
McLandress, C., Jonsson, A. I., Plummer, D. A., Reader, M. C., Scinocca,
J. F., and Shepherd, T. G.: Separating the dynamical effects of climate
change and ozone depletion. Part I: Southern hemisphere stratosphere, J.
Climate, 23, 5002–5020, https://doi.org/10.1175/2010JCLI3586.1, 2010. a, b
McLandress, C., Shepherd, T. G., Scinocca, J. F., Plummer, D. A., Sigmond,
M., Jonsson, A. I., and Reader, M. C.: Separating the dynamical effects of
climate change and ozone depletion. Part II: Southern Hemisphere
troposphere, J. Climate, 24, 1850–1868, https://doi.org/10.1175/2010JCLI3958.1, 2011. a
Meinshausen, M., Smith, S. J., Calvin, K., Daniel, J. S., Kainuma, M. L. T.,
Lamarque, J., Matsumoto, K., Montzka, S. A., Raper, S. C. B., Riahi, K.,
Thomson, A., Velders, G. J. M., and van Vuuren, D. P. P.: The RCP greenhouse
gas concentrations and their extensions from 1765 to 2300, Climatic Change,
109, 213–241, https://doi.org/10.1007/s10584-011-0156-z, 2011. a
Met Office: Unified Model (UM), available at:
https://www.metoffice.gov.uk/research/modelling-systems/unified-model,
last access: 30 October 2018. a
Molina, M. J. and Rowland, F. S.: Stratospheric sink for
chlorofluoromethanes: chlorine atomc-atalysed destruction of ozone, Nature,
249, 810–812, https://doi.org/10.1038/249810a0, 1974. a
Morgenstern, O., Braesicke, P., O'Connor, F. M., Bushell, A. C., Johnson, C.
E., Osprey, S. M., and Pyle, J. A.: Evaluation of the new UKCA
climate-composition model – Part 1: The stratosphere, Geosci. Model Dev., 2,
43–57, https://doi.org/10.5194/gmd-2-43-2009, 2009. a, b, c
Morgenstern, O., Giorgetta, M. A., Shibata, K., Eyring, V., Waugh, D. W.,
Shepherd, T. G., Akiyoshi, H., Austin, J., Baumgaertner, A. J. G., Bekki, S.,
Braesicke, P., Brühl, C., Chipperfield, M., Cugnet, D., Dameris, M.,
Dhomse, S., Frith, S. M., Garny, H., Gettelman, A., Hardiman, S. C., Hegglin,
M. I., Jöckel, P., Kinnison, D. E., Lamarque, J. F., Mancini, E.,
Manzini, E., Marchand, M., Michou, M., Nakamura, T., Nielsen, J. E.,
Olivié, D., Pitari, G., Plummer, D. A., Rozanov, E., Scinocca, J. F.,
Smale, D., Teyssèdre, H., Toohey, M., Tian, W., and Yamashita, Y.:
Review of the formulation of present-generation stratospheric
chemistry-climate models and associated external forcings, J. Geophys. Res.,
115, D00M02, https://doi.org/10.1029/2009JD013728, 2010. a
Morgenstern, O., Hegglin, M. I., Rozanov, E., O'Connor, F. M., Abraham, N.
L., Akiyoshi, H., Archibald, A. T., Bekki, S., Butchart, N., Chipperfield, M.
P., Deushi, M., Dhomse, S. S., Garcia, R. R., Hardiman, S. C., Horowitz, L.
W., Jöckel, P., Josse, B., Kinnison, D., Lin, M., Mancini, E., Manyin, M.
E., Marchand, M., Marécal, V., Michou, M., Oman, L. D., Pitari, G.,
Plummer, D. A., Revell, L. E., Saint-Martin, D., Schofield, R., Stenke, A.,
Stone, K., Sudo, K., Tanaka, T. Y., Tilmes, S., Yamashita, Y., Yoshida, K.,
and Zeng, G.: Review of the global models used within phase 1 of the
Chemistry–Climate Model Initiative (CCMI), Geosci. Model Dev., 10, 639–671,
https://doi.org/10.5194/gmd-10-639-2017, 2017. a
Neu, J. L., Prather, M. J., and Penner, J. E.: Global atmospheric chemistry:
Integrating over fractional cloud cover, J. Geophys. Res., 112, D11306,
https://doi.org/10.1029/2006JD008007, 2007. a
Newman, P. A., Daniel, J. S., Waugh, D. W., and Nash, E. R.: A new
formulation of equivalent effective stratospheric chlorine (EESC), Atmos.
Chem. Phys., 7, 4537–4552, https://doi.org/10.5194/acp-7-4537-2007, 2007. a
O'Connor, F. M., Johnson, C. E., Morgenstern, O., Abraham, N. L., Braesicke,
P., Dalvi, M., Folberth, G. A., Sanderson, M. G., Telford, P. J.,
Voulgarakis, A., Young, P. J., Zeng, G., Collins, W. J., and Pyle, J. A.:
Evaluation of the new UKCA climate-composition model – Part 2: The
Troposphere, Geosci. Model Dev., 7, 41–91, https://doi.org/10.5194/gmd-7-41-2014,
2014. a
Rayner, N. A., Parker, D. E., Horton, E. B., Folland, C. K., Alexander,
L. V., Rowell, D. P., Kent, E. C., and Kaplan, A.: Global analyses of sea
surface temperature, sea ice, and night marine air temperature since the late
nineteenth century, J. Geophys. Res., 108, 4407, https://doi.org/10.1029/2002JD002670,
2003. a
Reinsel, G. C., Weatherhead, E. C., Tiao, G. C., Miller, A. J., Nagatani,
R. M., Wuebbles, D. J., and Flynn, L. E.: On detection of turnaround and
recovery in trend for ozone, J. Geophys. Res., 107, ACH 1-1–ACH 1-12, 2002. a
Sen Gupta, A. and England, M. H.: Coupled Ocean-Atmosphere-Ice Response to
Variations in the Southern Annular Mode, J. Climate, 19, 4457–4486, 2006. a
Shindell, D. T., Schmidt, G. A., Miller, R. L., and Rind, D.: Northern
Hemisphere winter climate response to greenhous gas, ozone, solar and
volcanic forcing, J. Geophys. Res., 106, 7193–7210, 2001. a
Sinnhuber, B.-M., Sheode, N., Sinnhuber, M., Chipperfield, M. P., and Feng,
W.: The contribution of anthropogenic bromine emissions to past stratospheric
ozone trends: a modelling study, Atmos. Chem. Phys., 9, 2863–2871,
https://doi.org/10.5194/acp-9-2863-2009, 2009. a, b
Solanki, S. K., Krivova, N. A., and Haigh, J. D.: Solar Irradiance
Variability and Climate, Annu. Rev. Astron. Astr., 51, 311–351,
https://doi.org/10.1146/annurev-astro-082812-141007, 2013. a
Solomon, S., Haskins, J., Ivy, D. J., and Min, F.: Fundamental differences
between Arctic and Antarctic ozone depletion, P. Natl. Acad. Sci. USA, 111,
6220–6225, https://doi.org/10.1073/pnas.1319307111, 2014. a
Solomon, S., Kinnison, D., Bandoro, J., and Garcia, R.: Simulation of polar
ozone depletion: An update, J. Geophys. Res.-Atmos., 120, 7958–7974,
https://doi.org/10.1002/2015JD023365, 2015. a
Steele, H. M. and Hamill, P.: Effects of Temperature and Humidity on the
Acid-Water Droplets in the Stratosphere, J. Aerosol Sci., 12, 517–528,
1981. a
Steinbrecht, W., Claude, H., and Winkler, P.: Enhanced upper stratospheric
ozone: Sign of recovery or solar cycle effect?, J. Geophys. Res., 109,
D14306, https://doi.org/10.1029/2004JD004948, 2004. a
Telford, P. J., Abraham, N. L., Archibald, A. T., Braesicke, P., Dalvi, M.,
Morgenstern, O., O'Connor, F. M., Richards, N. A. D., and Pyle, J. A.:
Implementation of the Fast-JX Photolysis scheme (v6.4) into the UKCA
component of the MetUM chemistry-climate model (v7.3), Geosci. Model Dev., 6,
161–177, https://doi.org/10.5194/gmd-6-161-2013, 2013. a
Thompson, D. W. J. and Solomon, S.: Interpretation of Recent Southern
Hemisphere Climate Change, Science, 296, 895–899, 2002. a
Thompson, D. W. J., Solomon, S., Kushner, P. J., England, M. H., Grise,
K. M., and Karoly, D. J.: Signatures of the Antarctic ozone hole in Southern
Hemisphere surface climate change, Nat. Geosci., 4, 741–749,
https://doi.org/10.1038/ngeo1296, 2011. a
Tourpali, K., Schuurmans, C. J. E., van Dorland, R., Steil, B., and
Brühl, C.: Stratospheric and tropospheric response to enhanced solar
UV radiation: A model study, Geophys. Res. Lett., 30, 1231,
https://doi.org/10.1029/2002GL016650, 2003. a
Tourpali, K., Zerefos, C. S., Balis, D. S., and Bais, A. F.: The 11-year
solar cycle in stratospheric ozone: Comparison between Umkehr and SBUVv8 and
effects on surface erythemal irradiance, J. Geophys. Res., 112, D12306,
https://doi.org/10.1029/2006JD007760, 2007. a
van Vuuren, D. P., Edmonds, J., Kainuma, M., Riahi, K., Thomson, A., Hibbard,
K., Hurtt, G. C., Kram, T., Krey, V., Lamarque, J.-F., Masui, T.,
Meinshausen, M., Nakicenovic, N., Smith, S. J., and Rose, S. K.: The
representative concentration pathways: an overview, Climatic Change, 109,
5–31, https://doi.org/10.1007/s10584-011-0148-z, 2011. a
Walters, D., Baran, A., Boutle, I., Brooks, M., Earnshaw, P., Edwards, J.,
Furtado, K., Hill, P., Lock, A., Manners, J., Morcrette, C., Mulcahy, J.,
Sanchez, C., Smith, C., Stratton, R., Tennant, W., Tomassini, L., Van
Weverberg, K., Vosper, S., Willett, M., Browse, J., Bushell, A., Dalvi, M.,
Essery, R., Gedney, N., Hardiman, S., Johnson, B., Johnson, C., Jones, A.,
Mann, G., Milton, S., Rumbold, H., Sellar, A., Ujiie, M., Whitall, M.,
Williams, K., and Zerroukat, M.: The Met Office Unified Model Global
Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations, Geosci. Model
Dev. Discuss., https://doi.org/10.5194/gmd-2017-291, in review, 2017. a
Wild, O., Zhu, X., and Prather, J.: Fast-J: accurate simulation of the in-
and below cloud photolysis in tropospheric chemical models, J. Atmos. Chem.,
37, 245–282, 2000. a
Wilson, D. R. and Ballard, S. P.: A microphysically based precipitation
scheme for the UK Meteorological Office Unified Model, Q. J. Roy. Meteor.
Soc., 125, 1607–1636, 1999. a
WMO: Scientific Assessment of Ozone Depletion: 2010, Tech. Rep. 52, World
Meteorological Organization, Geneva, Switzerland, 2011. a
Yang, X., Abraham, N. L., Archibald, A. T., Braesicke, P., Keeble, J.,
Telford, P. J., Warwick, N. J., and Pyle, J. A.: How sensitive is the
recovery of stratospheric ozone to changes in concentrations of very
short-lived bromocarbons?, Atmos. Chem. Phys., 14, 10431–10438,
https://doi.org/10.5194/acp-14-10431-2014, 2014. a, b, c, d
Yin, J. H.: A consistent poleward shift of the storm tracks in simulations
of 21st century climate, Geophys. Res. Lett., 32, L18701,
https://doi.org/10.1029/2005GL023684, 2005. a
Zerefos, C. S., Tourpali, K., Bojkov, B. R., Balis, D. S., and Isaksen, I.
S. A.: Solar activity-total column ozone relationships: Observations and
model studies with heterogeneous chemistry, J. Geophys. Res., 102,
1561–1569, 1997. a
Zhang, R., Leu, M.-T., and Keyser, L. F.: Heterogeneous Reactions of
ClONO2, HCl, and HOCl on Liquid Sulfuric Acid Surfaces, J. Phys.
Chem., 98, 13583–13574, https://doi.org/10.1021/j100102a022, 1994. a, b
Zhang, R., Leu, M.-T., and Keyser, L. F.: Hydrolysis of N2O5 and
ClONO2 on the ternary solutions under
stratospheric conditions, Geophys. Res. Lett., 22, 1493–1496, 1995. a
Short summary
Two developments are made to the United Kingdom Chemistry and Aerosols (UKCA) model to improve simulation of stratospheric ozone. The first is the addition of a solar cycle. The influence on ozone from the solar cycle is found to be 1–2 %, which is consistent with other studies. The second is to the heterogeneous chemistry, the most significant change being the addition of reactions involving bromine species. This was shown to reduce ozone biases relative to observations in most regions.
Two developments are made to the United Kingdom Chemistry and Aerosols (UKCA) model to improve...