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

Archibald, Alexander T. and O'Connor, Fiona and Abraham, N. Luke and Archer-Nicholls, Scott and Chipperfield, Martyn and Dalvi, Mohit and Folberth, Gerd and Dennison, Fraser and Dhomse, Sandip and Griffiths, Paul T. and Hardacre, Catherine and Hewitt, Alan and Hill, Richard S. and Johnson, Colin E. and Keeble, James and Köhler, Marcus O. and Morgenstern, Olaf and Mulcahy, Jane P. and Ordonez, Carlos and Pope, Richard J. and Rumbold, Steven T. and Russo, Maria R. and Savage, Nick H. and Sellar, Alistair and Stringer, Marc and Turnock, Steven T. and Wild, Oliver and Zeng, Guang (2020) Description and evaluation of the UKCA stratosphere–troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1. Geoscientific Model Development, 13. pp. 1223-1266. ISSN 1991-959X

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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 for tropospheric ozone and its budget terms 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.

Item Type:
Journal Article
Journal or Publication Title:
Geoscientific Model Development
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
142510
Deposited By:
Deposited On:
18 Mar 2020 16:15
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 06:03