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| Titel |
The last interglacial (Eemian) climate simulated by LOVECLIM and CCSM3 |
| VerfasserIn |
I. Nikolova, Q. Yin, A. Berger, U. K. Singh, M. P. Karami |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2013-08-02), S.1789-1806 |
| Datensatznummer |
250085199
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| Publikation (Nr.) |
 copernicus.org/cp-9-1789-2013.pdf |
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| Zusammenfassung |
| This paper presents a detailed analysis of the climate of the last
interglacial simulated by two climate models of different complexities,
CCSM3 (Community Climate System Model 3) and LOVECLIM (LOch-Vecode-Ecbilt-CLio-agIsm Model). The simulated surface temperature, hydrological cycle,
vegetation and ENSO variability during the last interglacial are analyzed
through the comparison with the simulated pre-industrial (PI) climate. In
both models, the last interglacial period is characterized by a significant
warming (cooling) over almost all the continents during boreal summer
(winter) leading to a largely increased (reduced) seasonal contrast in the
Northern (Southern) Hemisphere. This is mainly due to the much higher
(lower) insolation received by the whole Earth in boreal summer (winter)
during this interglacial. The Arctic is warmer than PI through the whole
year, resulting from its much higher summer insolation, its remnant effect
in the following fall-winter through the interactions between atmosphere,
ocean and sea ice and feedbacks from sea ice and snow cover. Discrepancies
exist in the sea-ice formation zones between the two models. Cooling is
simulated by CCSM3 in the Greenland and Norwegian seas and near the shelves of
Antarctica during DJF but not in LOVECLIM as a result of excessive sea-ice
formation. Intensified African monsoon is responsible for the cooling during
summer in northern Africa and on the Arabian Peninsula. Over India, the
precipitation maximum is found further west, while in Africa the
precipitation maximum migrates further north. Trees and grassland expand
north in Sahel/Sahara, more clearly seen in LOVECLIM than in CCSM3 results.
A mix of forest and grassland occupies continents and expands deep into the
high northern latitudes. Desert areas reduce significantly in the Northern
Hemisphere, but increase in northern Australia. The interannual SST variability
of the tropical Pacific (El-Niño Southern Oscillation) of the last
interglacial simulated by CCSM3 shows slightly larger variability and
magnitude compared to the PI. However, the SST variability in our LOVECLIM
simulations is particularly small due to the overestimated thermocline's
depth. |
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