Articles | Volume 12, issue 3
Development and technical paper
29 Mar 2019
Development and technical paper |  | 29 Mar 2019

Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions

Fraser Dennison, James Keeble, Olaf Morgenstern, Guang Zeng, N. Luke Abraham, and Xin Yang

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Cited articles

Angell, J. K.: On the Relation between Atmospheric Ozone and Sunspot Number, J. Climate, 2, 1404–1416,<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.,, in review, 2018. a, b, c, d, e
Bian, H. and Prather, M. J.: Fast-J2: Accurate Simulation of Stratospheric Photolysis in Global Chemical Models, J. Atmos. Chem., 41, 281–296, 2002. a, b
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,, 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: (last access: 19 April 2018), 2015. a, b, c
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.