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| Titel |
Evaluation of the new UKCA climate-composition model – Part 1: The stratosphere |
| VerfasserIn |
O. Morgenstern, P. Braesicke, F. M. O'Connor, A. C. Bushell, C. E. Johnson, S. M. Osprey, J. A. Pyle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 2, no. 1 ; Nr. 2, no. 1 (2009-03-20), S.43-57 |
| Datensatznummer |
250000421
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| Publikation (Nr.) |
 copernicus.org/gmd-2-43-2009.pdf |
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| Zusammenfassung |
| The UK Chemistry and Aerosols (UKCA) model is a new
aerosol-chemistry model coupled to the Met Office Unified Model capable of simulating composition and
climate from the troposphere to the mesosphere. Here we introduce the
model and assess its performance with a particular focus on the
stratosphere. A 20-year perpetual year-2000 simulation forms the basis
of our analysis. We assess basic and derived dynamical and chemical model fields and
compare to ERA-40 reanalyses and satellite climatologies. Polar temperatures
and the lifetime of the southern polar vortex are well captured, indicating
that the model is suitable for assessing the ozone hole. Ozone and long-lived
tracers compare favourably to observations. Chemical-dynamical coupling, as evidenced by the anticorrelation
between winter-spring northern polar ozone columns and the strength of the
polar jet, is also well captured. Remaining problems relate to a
warm bias at the tropical tropopause, slow ascent in the tropical
pipe with implications for the lifetimes of long-lived species, and a general
overestimation of ozone columns in middle and high latitudes. |
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