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155,000 Years of West African Monsoon and Ocean Thermal Evolution
Abstract
A detailed reconstruction of West African monsoon hydrology over the past 155,000 years suggests a close linkage to northern high-latitude climate oscillations. Ba/Ca ratio and oxygen isotope composition of planktonic foraminifera in a marine sediment core from the Gulf of Guinea, in the eastern equatorial Atlantic (EEA), reveal centennial-scale variations of riverine freshwater input that are synchronous with northern high-latitude stadials and interstadials of the penultimate interglacial and the last deglaciation. EEA Mg/Ca-based sea surface temperatures (SSTs) were decoupled from northern high-latitude millennial-scale fluctuation and primarily responded to changes in atmospheric greenhouse gases and low-latitude solar insolation. The onset of enhanced monsoon precipitation lags behind the changes in EEA SSTs by up to 7000 years during glacial-interglacial transitions. This study demonstrates that the stadial-interstadial and deglacial climate instability of the northern high latitudes exerts dominant control on the West African monsoon dynamics through an atmospheric linkage.
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Cited by
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Shanahan, T. M., Overpeck, J. T., Anchukaitis, K. J., Beck, J. W., Cole, J. E., Dettman, D. L., Peck, J. A., Scholz, C. A., & King, J. W. (2009) · Science · doi:10.1126/science.1166352 · Cited by 384
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McGee, D., Donohoe, A., Marshall, J., & Ferreira, D. (2014) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2013.12.043 · Cited by 331
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Metadata
- Authors
- Weldeab, S., Lea, D. W., Schneider, R. R., & Andersen, N.
- Venue
- Science
- Published
- 2007-06
- Volume
- 316
- Issue
- 5829
- Pages
- 1303-1307
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1995191065
- Cited by
- 444
- References
- 0
- FWCI
- 14.89
- Type
- journal article
- Language
- en
- Open access
- closed
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