Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Description and evaluation of the UKCA stratosphere–troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1
AU - Archibald, Alexander T.
AU - O'Connor, Fiona
AU - Abraham, N. Luke
AU - Archer-Nicholls, Scott
AU - Chipperfield, Martyn
AU - Dalvi, Mohit
AU - Folberth, Gerd
AU - Dennison, Fraser
AU - Dhomse, Sandip
AU - Griffiths, Paul T.
AU - Hardacre, Catherine
AU - Hewitt, Alan
AU - Hill, Richard S.
AU - Johnson, Colin E.
AU - Keeble, James
AU - Köhler, Marcus O.
AU - Morgenstern, Olaf
AU - Mulcahy, Jane P.
AU - Ordonez, Carlos
AU - Pope, Richard J.
AU - Rumbold, Steven T.
AU - Russo, Maria R.
AU - Savage, Nick H.
AU - Sellar, Alistair
AU - Stringer, Marc
AU - Turnock, Steven T.
AU - Wild, Oliver
AU - Zeng, Guang
PY - 2020/3/17
Y1 - 2020/3/17
N2 - 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.
AB - 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.
KW - Ozone
KW - Atmospheric modelling
KW - Atmospheric chemistry
KW - Model development
KW - Chemistry scheme
U2 - 10.5194/gmd-13-1223-2020
DO - 10.5194/gmd-13-1223-2020
M3 - Journal article
VL - 13
SP - 1223
EP - 1266
JO - Geoscientific Model Development
JF - Geoscientific Model Development
SN - 1991-959X
ER -