DOI: 10.1016/j.palaeo.2012.10.015
论文题名: A regional climate model study of the impact of tectonic and orbital forcing on African precipitation and vegetation
作者: Prömmel K. ; Cubasch U. ; Kaspar F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369 起始页码: 154
结束页码: 162
语种: 英语
英文关键词: Africa
; Eemian
; Orography change
; Precipitation
; Regional climate modeling
; Vegetation
英文摘要: The development of the East African Rift System (EARS) caused by tectonic forcing during the past 20. million years is believed to influence the regional climate in Africa. However, changes in the Earth's orbital parameters also have an influence on climate on these timescales. To analyze the influence of both tectonic and orbital forcing, we applied the non-hydrostatic regional climate model COSMO-CLM (COSMO model in Climate Mode, CCLM). The regional simulations are driven by different global simulations performed with the coupled ocean-atmosphere general circulation model ECHO-G. To analyze the impact of tectonic forcing a different topography representing a possible past stage of the development of the EARS is applied in the model. The results indicate that tectonic forcing has a strong impact on precipitation in Africa caused by circulation changes. To analyze the impact of orbital forcing, which means the impact of changing insolation patterns, we chose configurations of the Earth's orbit that result in significantly different patterns of insolation. One example is the orbital configuration of the last interglacial at 125,000. years before present, when the seasonality of insolation in the Northern Hemisphere was greatly enhanced, whereas in the Southern Hemisphere it was substantially weakened compared to preindustrial conditions. The simulation of this time slice shows a strong impact of orbital forcing on precipitation in large parts of Africa, caused by altered moisture transport. The application of a biome model helps in analyzing the impact of the two forcing factors on vegetation for a more direct comparison with proxy data. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69902
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Meteorology, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, Germany; Deutscher Wetterdienst, Frankfurter Str. 135, 63067 Offenbach, Germany
Recommended Citation:
Prömmel K.,Cubasch U.,Kaspar F.. A regional climate model study of the impact of tectonic and orbital forcing on African precipitation and vegetation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369