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| Titel |
On the importance of initial conditions for simulations of the Mid-Holocene climate |
| VerfasserIn |
H. Renssen, E. Driesschaert, M. F. Loutre, T. Fichefet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 2, no. 2 ; Nr. 2, no. 2 (2006-09-19), S.91-97 |
| Datensatznummer |
250000496
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| Publikation (Nr.) |
 copernicus.org/cp-2-91-2006.pdf |
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| Zusammenfassung |
| Three simulations of the Mid-Holocene (6 ka) climate were performed with the
ECBilt-CLIO-VECODE coupled atmosphere-ocean-vegetation model to study the
impact of initial conditions. These experiments were forced with identical
6 ka forcings (orbital parameters and atmospheric greenhouse gas
concentrations) and differed only in initial conditions. Two simulations
were designed as equilibrium experiments, with one being initialized with
preindustrial conditions as required by the protocol of the Paleoclimate
Modelling Intercomparison Project (PMIP), while in a second experiment early
Holocene (9 ka) initial conditions were used. These equilibrium simulations
were run for 2100 years with 6 ka forcings. The third experiment was set up
as a transient simulation, also starting from early Holocene conditions, but
forced with annually changing orbital parameters and greenhouse gas levels.
The results of the last 100 years are compared and reveal no statistically
significant differences, showing that in this model the initial conditions
have no discernible impact on the 6 ka climate. This suggests that the PMIP
set-up for 6 ka simulations is valid, with the condition that spin-up phase
should be long enough (at least 550 years) to allow the deep ocean to adjust
to the change in forcings. |
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