Half-precessional dynamics of monsoon rainfall near the East African Equator

Dirk Verschuren (), Jaap S. Sinninghe Damsté, Jasper Moernaut, Iris Kristen, Maarten Blaauw, Maureen Fagot and Gerald H. Haug
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Dirk Verschuren: Limnology Unit, Ghent University, Ledeganckstraat 35, 9000 Gent, Belgium
Jaap S. Sinninghe Damsté: Faculty of Geosciences, Utrecht University, PO Box 80021, 3508 TA Utrecht, The Netherlands
Jasper Moernaut: Renard Centre of Marine Geology, Ghent University, Krijgslaan 281 S8, 9000 Gent, Belgium
Iris Kristen: GeoForschungsZentrum Potsdam, Sektion 3.3 Klimadynamik und Sedimente, Telegrafenberg, D-14473 Potsdam, Germany
Maarten Blaauw: School of Geography, Archaeology and Palaeoecology, Queen's University Belfast
Maureen Fagot: Limnology Unit, Ghent University, Ledeganckstraat 35, 9000 Gent, Belgium
Gerald H. Haug: Geological Institute, ETH Zürich, CH-8092 Zürich, Switzerland

Nature, 2009, vol. 462, issue 7273, 637-641

Abstract: Solar influence on monsoons External climate influences — such as changes in solar radiation or insolation — generate different responses in different regions. There are extensive records from high and low latitudes with which to assess the relationship between insolation and climate variability. But tropical records are much rarer, and records from regions in the path of the Intertropical Convergence Zone, which produces the monsoonal climate of alternating wet and dry seasons, are rarer still. Verschuren et al. have found one such record and analyse proxies of hydrologic variability in the 25,000-year sediment sequence of Lake Challa, a crater lake on the slopes of Mount Kilimanjaro. They find that monsoon rainfall in East Africa varied in cycles of about 11,500 years, in phase with orbitally controlled solar radiation forcing.

Date: 2009
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DOI: 10.1038/nature08520

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