Articles | Volume 12, issue 18
https://doi.org/10.5194/bg-12-5415-2015
https://doi.org/10.5194/bg-12-5415-2015
Research article
 | 
18 Sep 2015
Research article |  | 18 Sep 2015

A comparison of benthic foraminiferal Mn / Ca and sedimentary Mn / Al as proxies of relative bottom-water oxygenation in the low-latitude NE Atlantic upwelling system

C. L. McKay, J. Groeneveld, H. L. Filipsson, D. Gallego-Torres, M. J. Whitehouse, T. Toyofuku, and O.E. Romero

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Revised manuscript accepted for BG
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Cited articles

Allison, N. and Austin, W. E. N.: The potential of ion microprobe analysis in detecting geochemical variations across individual foraminifera tests, Geochem. Geophys. Geosys., 4, 8403, https://doi.org/10.1029/2002GC000430, 2003.
Bakun, A., Field, D. B., Redondo-Rodriguez, A. N. A., and Weeks, S. J.: Greenhouse gas, upwelling-favorable winds, and the future of coastal ocean upwelling ecosystems, Glob. Change Biol., 16, 1213–1228, 2010.
Barker, S., Greaves, M., and Elderfield, H.: A study of cleaning procedures used for foraminiferal Mg / Ca paleothermometry, Geochem. Geophys. Geosys., 4, 8407, https://doi.org/10.1029/2003GC000559, 2003.
Bice, K. L., Layne, G. D., and Dahl, K.: Application of secondary ion mass spectrometry to the determination of Mg / Ca in rare, delicate, or altered planktonic foraminifera: Examples from the Holocene, Paleogene, and Cretaceous, Geochem. Geophys. Geosys., 6, Q12P07, https://doi.org/10.1029/2005GC000974, 2005.
Böning, P., Brumsack, H.-J., Böttcher, M. E., Schnetger, B., Kriete, C., Kallmeyer, J., and Borchers, S. L.: Geochemistry of Peruvian near-surface sediments, Geochim. Cosmochim. Acta, 68, 4429–4451, 2004.
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Short summary
We highlight the proxy potential of foraminiferal Mn/Ca determined by secondary ion mass spectrometry and flow-through inductively coupled plasma optical emission spectroscopy for recording changes in bottom-water oxygen conditions. Comparisons with Mn sediment bulk measurements from the same sediment core largely agree with the results. High foraminiferal Mn/Ca occurs in samples from times of high productivity export and corresponds with the benthic foraminiferal faunal composition.
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