NDLI: Impacts of tectonic and orbital forcing on East African climate: a comparison based on global climate model simulations

Content Provider	Springer Nature Link
Author	Kaspar, Frank Prömmel, Kerstin Cubasch, Ulrich
Copyright Year	2010
Abstract	A global atmosphere–ocean model has been forced with topographic and orbital scenarios in order to evaluate the relative role of both factors for the past climate of East Africa. Forcing the model with a significantly reduced topography in Eastern and Southern Africa leads to a distinct increase in moisture transport from the Indian Ocean into the eastern part of the continent and increased precipitation in Eastern Africa. Simulations with step-wise reduced height show that this climate change occurs continuously with the change in topography, i.e., an abrupt change of local climatic features with a critical height is not found. Simulations of the last interglacial (at 125,000 years before present, i.e., the Eemian interglacial) and the last glacial inception (at 115,000 years before present) are used as examples for the role of orbital-induced changes in insolation. Here, changes in meridional temperature gradients lead to modifications in moisture transport of similar order of magnitude, but with different spatial and seasonal structure. For the Eemian interglacial, a distinct increase in summer moisture transport from the Atlantic deep into the continent at around 20°N is simulated.
Starting Page	1677
Ending Page	1686
Page Count	10
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	99
Issue Number	7
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-04-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Climate simulation Paleoclimate Africa East African Rift System Tectonics Orbital forcing Interglacial Glacial Quaternary Cenozoic Human evolution Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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