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| Titel |
Roles of ice-sheet topography, albedo and greenhouse gas forcings in the LGM climate |
| VerfasserIn |
M. Kageyama, D. Roche, M. Khodri |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030323
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| Zusammenfassung |
| The main forcing factors for the LGM climate are the large northern hemisphere ice-sheets, via their topography and their albedo and the lower greenhouse gases atmospheric concentrations. The ice-sheet forcings are expected to modify the radiative balance, most obviously through the surface albedo change related to the ice-sheet presence at mid-latitudes, and atmospheric circulation, e.g. through the direct effect of the large topography difference. The greenhouse gas concentration lowering at the LGM is expected to have an impact at a global scale, with, if symmetrical with the increased CO2 experiments, polar amplification of the temperature response. In this work we investigate the responses of the ocean-atmosphere system to each of these forcings taken separately and compare them to the full LGM response. Two atmosphere-ocean coupled general circulation models, IPSL_CM4 and LOVECLIM are used to establish the robustness of the results, in terms of temperature, circulation and precipitation. |
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