Journal
SCIENCE
Volume 322, Issue 5899, Pages 252-255Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1160485
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Funding
- Nyanza Project [NSF-ATM 0223920, BIO 0383765]
- National Defense Science and Engineering Graduate Fellowship
- [NSF-EAR 0639474]
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The processes that control climate in the tropics are poorly understood. We applied compound-specific hydrogen isotopes (delta D) and the TEX86 (tetraether index of 86 carbon atoms) temperature proxy to sediment cores from Lake Tanganyika to independently reconstruct precipitation and temperature variations during the past 60,000 years. Tanganyika temperatures follow Northern Hemisphere insolation and indicate that warming in tropical southeast Africa during the last glacial termination began to increase similar to 3000 years before atmospheric carbon dioxide concentrations. delta D data show that this region experienced abrupt changes in hydrology coeval with orbital and millennial-scale events recorded in Northern Hemisphere monsoonal climate records. This implies that precipitation in tropical southeast Africa is more strongly controlled by changes in Indian Ocean sea surface temperatures and the winter Indian monsoon than by migration of the Intertropical Convergence Zone.
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