Articles | Volume 17, issue 2
Clim. Past, 17, 603–614, 2021
https://doi.org/10.5194/cp-17-603-2021
Clim. Past, 17, 603–614, 2021
https://doi.org/10.5194/cp-17-603-2021

Research article 09 Mar 2021

Research article | 09 Mar 2021

Nutrient utilization and diatom productivity changes in the low-latitude south-eastern Atlantic over the past 70 ka: response to Southern Ocean leakage

Katharine Hendry et al.

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Cited articles

Abrantes, F.: 200 000 yr diatom records from Atlantic upwelling sites reveal maximum productivity during LGM and a shift in phytoplankton community structure at 185 000 yr, Earth Planet. Sci. Lett., 176, 7–16, 2000. a
Abrantes, F.: A 340,000 year continental climate record from tropical Africa – news from opal phytoliths from the equatorial Atlantic, Earth Planet. Sci. Lett., 209, 165–179, 2003. a
Berger, W. and Wefer, G.: Expeditions into the past: paleoceanographic studies in the South Atlantic, in: The South Atlantic, edited by: Wefer, G., Berger, W. H., Siedler, G., and Webb, D. J., Springer, Berlin, Heidelberg, Germany, 363–410, 1996. a
Berger, W. H., Lange, C. B., and Wefer, G.: Upwelling history of the Benguela-Namibia system: A synthesis of Leg 175 results, Proceedings of the Ocean Drilling Program, Scientific Results, 175, 1–103, 2002. a
Bradtmiller, L., Anderson, R., Fleisher, M., and Burckle, L.: Diatom productivity in the equatorial Pacific Ocean from the last glacial period to the present: A test of the silicic acid leakage hypothesis, Paleoceanography, 21, PA4201, https://doi.org/10.1029/2006PA001282, 2006. a
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Productive eastern boundary upwelling systems (EBUs) are characterized by abundant siliceous algae and diatoms, and they play a key role in carbon fixation. Understanding past shifts in diatom production is critical for predicting the impact of future climate change. We combine existing sediment archives from the Benguela EBU with new diatom isotope analyses and modelling to reconstruct late Quaternary silica cycling, which we suggest depends on both upwelling intensity and surface utilization.