Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cpd-2-1347-2006
© Author(s) 2006. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
 
13 Dec 2006
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A revision of this discussion paper for further review has not been submitted.
Simulations of the last interglacial and the subsequent glacial inception with the Planet Simulator
M. Donat and F. Kaspar Freie Universität Berlin, Institut für Meteorologie, Berlin, Germany
Abstract. The Planet Simulator was used to perform equilibrium simulations of the Eemian interglacial at 125 kyBP and the glacial inception at 115 kyBP. Additionally, an accelerated transient simulation of that interval was performed. During this period the changes of Earth's orbital parameters led to a reduction of summer insolation in the northern latitudes. The model has been run in different configurations in order to evaluate the influence of the individual sub-models. The strongest reaction on the insolation change was observed when the atmosphere was coupled with all available sub-systems: a mixed-layer ocean and a sea-ice model as well as a vegetation model. In the simulations representing the interglacial, the near-surface temperature in northern latitudes is higher compared to the preindustrial reference run and almost no perennial snow cover occurs. In the run for the glacial inception, wide areas in mid and high northern latitudes show negative temperature anomalies and wide areas are covered by snow or ice. The transient simulation shows that snow volume starts to increase after summer insolation has fallen below a critical value. The main reason for the beginning glaciation is the locally reduced (summer) temperature as a consequence of reduced summer insolation. Therefore, a larger fraction of precipitation falls as snow and less snow can melt. That mechanism is amplified by the snow-albedo-feedback.

Citation: Donat, M. and Kaspar, F.: Simulations of the last interglacial and the subsequent glacial inception with the Planet Simulator, Clim. Past Discuss., 2, 1347-1369, doi:10.5194/cpd-2-1347-2006, 2006.
M. Donat and F. Kaspar
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC S758: 'Referee Comment', Anonymous Referee #2, 05 Jan 2007 Printer-friendly Version 
AC S941: 'Paper withdrawn. See author comments.', Markus Donat, 04 Apr 2007 Printer-friendly Version 
 
RC S809: 'review', Anonymous Referee #1, 18 Jan 2007 Printer-friendly Version 
 
AC S939: 'Problems with vegetation in PLASIM', Markus Donat, 04 Apr 2007 Printer-friendly Version 
M. Donat and F. Kaspar
M. Donat and F. Kaspar

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