Publication Abstracts

Orbe et al. 2019, submitted

Orbe, C., D.A. Plummer, D.W. Waugh, H. Yang, P. Jöckel, D.E. Kinnison, B. Josse, V. Marecal, M. Deushi, N.L. Abraham, A.T. Archibald, M.P. Chipperfield, S. Dhomse, W. Feng, and S. Bekki, 2019: Description and evaluation of the Specified-Dynamics Experiment in the Chemistry-Climate Model Initiative (CCMI). Atmos. Chem. Phys., submitted, doi:10.5194/acp-2019-625.

Here we provide an overview of the REF-C1SD "Specified-Dynamics" experiment that was conducted as part of Phase 1 of the Chemistry-Climate Model Initiative (CCMI). The REF-C1SD experiment, which consisted of mainly online general circulation models (GCMs) constrained with (re)analysis fields, was designed to examine the influence of the large-scale circulation on past trends in atmospheric composition. The REF-C1SD simulations were produced across various model frameworks and we evaluate how well the simulations represent different measures of the dynamical and transport circulations. In the troposphere there are large (∼40%) differences in the climatological mean distributions and seasonal cycle amplitude of the meridional and vertical winds. In the stratosphere there are similarly large (∼50%) differences in the magnitude and seasonal cycle amplitude of the Transformed Eulerian Mean circulation and among various chemical and idealized tracers. For nearly all variables these differences are not related to the use of different reanalysis products; rather, we show they are associated with how the simulations were implemented, by which we refer both to how the large-scale flow was prescribed and to biases in the underlying free-running models. Furthermore, in most cases these differences are shown to be as large or even larger than the differences exhibited by free-running simulations produced using the exact same models. Overall, our results suggest that care must be taken when using specified-dynamics simulations to examine the influence of large-scale dynamics on composition.

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BibTeX Citation

@unpublished{or09100t,
  author={Orbe, C. and Plummer, D. A. and Waugh, D. W. and Yang, H. and Jöckel, P. and Kinnison, D. E. and Josse, B. and Marecal, V. and Deushi, M. and Abraham, N. L. and Archibald, A. T. and Chipperfield, M. P. and Dhomse, S. and Feng, W. and Bekki, S.},
  title={Description and evaluation of the Specified-Dynamics Experiment in the Chemistry-Climate Model Initiative (CCMI)},
  year={2019},
  journal={Atmos. Chem. Phys.},
  doi={10.5194/acp-2019-625},
  note={Manuscript submitted for publication}
}

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RIS Citation

TY  - UNPB
ID  - or09100t
AU  - Orbe, C.
AU  - Plummer, D. A.
AU  - Waugh, D. W.
AU  - Yang, H.
AU  - Jöckel, P.
AU  - Kinnison, D. E.
AU  - Josse, B.
AU  - Marecal, V.
AU  - Deushi, M.
AU  - Abraham, N. L.
AU  - Archibald, A. T.
AU  - Chipperfield, M. P.
AU  - Dhomse, S.
AU  - Feng, W.
AU  - Bekki, S.
PY  - 2019
TI  - Description and evaluation of the Specified-Dynamics Experiment in the Chemistry-Climate Model Initiative (CCMI)
JA  - Atmos. Chem. Phys.
DO  - 10.5194/acp-2019-625
ER  -

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