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| Titel |
Modelling the mid-Pliocene Warm Period climate with the IPSL coupled model and its atmospheric component LMDZ5A |
| VerfasserIn |
C. Contoux, G. Ramstein, A. Jost |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2012-06-28), S.903-917 |
| Datensatznummer |
250002624
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| Publikation (Nr.) |
 copernicus.org/gmd-5-903-2012.pdf |
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| Zusammenfassung |
| This paper describes the experimental design and model results of the climate
simulations of the mid-Pliocene Warm Period (mPWP, ca. 3.3–3 Ma) using the
Institut Pierre Simon Laplace model (IPSLCM5A), in the framework of the
Pliocene Model Intercomparison Project (PlioMIP). We use the IPSL atmosphere
ocean general circulation model (AOGCM), and its atmospheric component alone
(AGCM), to simulate the climate of the mPWP. Boundary conditions such as sea
surface temperatures (SSTs), topography, ice-sheet extent and vegetation are
derived from the ones imposed by the Pliocene Model Intercomparison Project
(PlioMIP), described in Haywood et al. (2010, 2011). We first describe the IPSL model
main features, and then give a full description of the boundary conditions
used for atmospheric model and coupled model experiments. The climatic
outputs of the mPWP simulations are detailed and compared to the
corresponding control simulations. The simulated warming relative to the
control simulation is 1.94 °C in the atmospheric and 2.07 °C in
the coupled model experiments. In both experiments, warming is larger at high
latitudes. Mechanisms governing the simulated precipitation patterns are
different in the coupled model than in the atmospheric model alone, because
of the reduced gradients in imposed SSTs, which impacts the Hadley and Walker
circulations. In addition, a sensitivity test to the change of land-sea mask
in the atmospheric model, representing a sea-level change from present-day to
25 m higher during the mid-Pliocene, is described. We find that surface
temperature differences can be large (several degrees Celsius) but are
restricted to the areas that were changed from ocean to land or vice versa.
In terms of precipitation, impact on polar regions is minor although the
change in land-sea mask is significant in these areas. |
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