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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-246
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-246
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 25 Sep 2019

Submitted as: model description paper | 25 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Description and evaluation of the UKCA stratosphere-troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1

Alexander T. Archibald1,2, Fiona M. O'Connor3, N. Luke Abraham1,2, Scott Archer-Nicholls1, Martyn P. Chipperfield4,5, Mohit Dalvi3, Gerd A. Folberth3, Fraser Dennison4, Sandip S. Dhomse4,5, Paul T. Griffiths1,2, Catherine Hardacre3, Alan J. Hewitt3, Richard Hill3, Colin E. Johnson3, James Keeble1,2, Marcus O. Köhler1,7,a, Olaf Morgenstern6, Jane P. Mulchay3, Carlos Ordóñez3,b, Richard J. Pope4,5, Steven Rumbold3,8, Maria R. Russo1,2, Nicholas Savage3, Alistair Sellar3, Marc Stringer3, Steven Turnock3, Oliver Wild9, and Guang Zeng6 Alexander T. Archibald et al.
  • 1Department of Chemistry, University of Cambridge, Cambridge, UK, CB2 1EW
  • 2NCAS-Climate, University of Cambridge, UK, CB2 1EW
  • 3Met Office Hadley Centre, FitzRoy Road, Exeter, UK, EX1 3PB
  • 4School of Earth and Environment, University of Leeds, Leeds, UK, LS2 9JT
  • 5National Centre for Earth Observation (NCEO), University of Leeds, Leeds, U.K.
  • 6National Institute of Water & Atmospheric Research Ltd (NIWA), 301 Evans Bay Parade, Greta Point, Wellington, New Zealand
  • 7Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, U.K.
  • 8NCAS-Climate, Department of Meteorology, University of Reading, Reading, UK, RG6 6BB
  • 9Lancaster Environment Centre, Lancaster University, Lancaster, UK, LA1 4YQ
  • anow at: ECMWF, Reading, UK
  • bnow at: Departamento de Física de la Tierra y Astrofísica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Madrid 28040, Spain

Abstract. Here we present a description of the UKCA StratTrop chemical mechanism which is used in the UKESM1 Earth System Model for CMIP6. The StratTrop chemical mechanism is a merger of previously well evaluated tropospheric and stratospheric mechanisms and we provide results from a series of bespoke integrations to assess the overall performance of the model.

We find that the StratTrop scheme performs well when compared to a wide array of observations. 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. We find that the results obtained from the use of the StratTrop mechanism are sensitive to the host model; simulations with the same chemical mechanism run in an earlier version of the MetUM host model show a range of sensitivity to emissions that the current model does not fall within.

Whilst the general model performance is suitable for use in the UKESM1 CMIP6 integrations, we note some shortcomings in the scheme that future targeted studies will address.

Alexander T. Archibald et al.
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Status: final response (author comments only)
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Alexander T. Archibald et al.
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Short summary
Here we present a description and evaluation of the UKCA stratosphere-troposphere chemistry scheme (StratTrop vn 1.0) implemented in the UK Earth System Model (UKESM1). UKCA StratTrop represents a substantial step forward compared to previous versions of UKCA. We show here that it is fully suited to the challenges of representing interactions in a coupled Earth System Model and identify key areas and components for future development that will make it even better in the future.
Here we present a description and evaluation of the UKCA stratosphere-troposphere chemistry...
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