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Journal Article: BibTeX citation key:  Biasutti2006a
Biasutti, M. & Giannini, A. (2006) Robust Sahel drying in response to late 20th century forcings. IN Geophysical Research Letters, 33. L11706.
Added by: Boichard Jean-Luc 2010-08-05 10:13:45    Last Edited by: Fanny Lefebvre 2011-01-12 17:15:01
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Categories: General
Creators: Biasutti, Giannini
Collection: Geophysical Research Letters

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Abstract
he African Sahel experienced severe drying between the 1950s and the 1980s, with partial recovery since. We compare Sahel rainfall in the 20th century, pre-industrial, and increased greenhouse gases (GHG) simulations produced for the Intergovernmental Panel on Climate Change (IPCC). The simulations forced by 20th century concentrations of aerosol and GHG reproduce (i) a global change in SST akin to that associated with Sahel drought and (ii) a correspondent drying of the Sahel. We conclude that late 20th century Sahel climate was significantly dryer than pre-industrial, and at least 30% of the drying was externally forced. Comparison between 20th century runs and runs forced by GHG alone reveals the key role of reflective aerosols: they force a gradient in SST that excites robust drying in the northern edge of the Atlantic Inter-Tropical Convergence Zone (ITCZ) and in the Sahel.
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Added by: Fanny Lefebvre    Last Edited by: Fanny Lefebvre