Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation

Bette L. Otto-Bliesner, James M. Russell, Peter U. Clark, Zhengyu Liu, Jonathan T. Overpeck, Bronwen Konecky, Peter Demenocal, Sharon E. Nicholson, Feng He, Zhengyao Lu

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81 Scopus citations

Abstract

During the last deglaciation, wetter conditions developed abruptly ∼14,700 years ago in southeastern equatorial and northern Africa and continued into the Holocene. Explaining the abrupt onset and hemispheric coherence of this early African Humid Period is challenging due to opposing seasonal insolation patterns. In this work, we use a transient simulation with a climate model that provides a mechanistic understanding of deglacial tropical African precipitation changes. Our results show that meltwater-induced reduction in the Atlantic meridional overturning circulation (AMOC) during the early deglaciation suppressed precipitation in both regions. Once the AMOC reestablished, wetter conditions developed north of the equator in response to high summer insolation and increasing greenhouse gas (GHG) concentrations, whereas wetter conditions south of the equator were a response primarily to the GHG increase.

Original languageEnglish (US)
Pages (from-to)1223-1227
Number of pages5
JournalScience
Volume346
Issue number6214
DOIs
StatePublished - Dec 5 2014

ASJC Scopus subject areas

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    Otto-Bliesner, B. L., Russell, J. M., Clark, P. U., Liu, Z., Overpeck, J. T., Konecky, B., Demenocal, P., Nicholson, S. E., He, F., & Lu, Z. (2014). Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation. Science, 346(6214), 1223-1227. https://doi.org/10.1126/science.1259531