Articles | Volume 14, issue 12
https://doi.org/10.5194/bg-14-3067-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-14-3067-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
22 Jun 2017
Research article |
| 22 Jun 2017
Benthic foraminiferal Mn / Ca ratios reflect microhabitat preferences
Karoliina A. Koho
CORRESPONDING AUTHOR
Department of Ocean Systems, NIOZ-Royal Netherlands Institute for Sea
Research and Utrecht University, Den Burg, the Netherlands
Department of Environmental Sciences, P.O. Box 65 (Viikinkaari 1),
00014 University of Helsinki, Helsinki, Finland
Department of Earth Sciences – Geochemistry, Faculty of Geosciences,
Utrecht University, P.O. Box 80.021, 3508 TA Utrecht, the Netherlands
Lennart J. de Nooijer
Department of Ocean Systems, NIOZ-Royal Netherlands Institute for Sea
Research and Utrecht University, Den Burg, the Netherlands
Christophe Fontanier
Ifremer, Géosciences marines, Z.I. Pointe du Diable CS10070,
29280 Plouzané, France
Université of Bordeaux, Environnements et Paléo-environnements
Océaniques et Continentaux, UMR 5805, 33600 Talence, France
Laboratoire de planétologie et de géodynamique – bio-indicateurs actuels et fossiles, Université of Angers, 49035 Angers, France
Takashi Toyofuku
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15
Natsushima-cho, Yokosuka, 237-0061, Japan
Kazumasa Oguri
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15
Natsushima-cho, Yokosuka, 237-0061, Japan
Hiroshi Kitazato
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15
Natsushima-cho, Yokosuka, 237-0061, Japan
Tokyo University of Marine Science and Technology, 4-5-7 Konan,
Minato-ku 108-8477, Tokyo, Japan
Gert-Jan Reichart
Department of Ocean Systems, NIOZ-Royal Netherlands Institute for Sea
Research and Utrecht University, Den Burg, the Netherlands
Department of Earth Sciences – Geochemistry, Faculty of Geosciences,
Utrecht University, P.O. Box 80.021, 3508 TA Utrecht, the Netherlands
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The ratio of titanium to aluminum (Ti/Al) is an established way to reconstruct North African climate in eastern Mediterranean Sea sediments. We demonstrate here how to obtain reliable Ti/Al data using an efficient scanning method that allows rapid acquisition of long climate records at low expense. Using this method, we reconstruct a 3-million-year North African climate record. African environmental variability was paced predominantly by low-latitude insolation from 3–1.2 million years ago.
Carolien M. H. van der Weijst, Koen J. van der Laan, Francien Peterse, Gert-Jan Reichart, Francesca Sangiorgi, Stefan Schouten, Tjerk J. T. Veenstra, and Appy Sluijs
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The TEX86 proxy is often used by paleoceanographers to reconstruct past sea-surface temperatures. However, the origin of the TEX86 signal in marine sediments has been debated since the proxy was first proposed. In our paper, we show that TEX86 carries a mixed sea-surface and subsurface temperature signal and should be calibrated accordingly. Using our 15-million-year record, we subsequently show how a TEX86 subsurface temperature record can be used to inform us on past sea-surface temperatures.
Carolien M. H. van der Weijst, Josse Winkelhorst, Wesley de Nooijer, Anna von der Heydt, Gert-Jan Reichart, Francesca Sangiorgi, and Appy Sluijs
Clim. Past, 18, 961–973, https://doi.org/10.5194/cp-18-961-2022, https://doi.org/10.5194/cp-18-961-2022, 2022
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A hypothesized link between Pliocene (5.3–2.5 million years ago) global climate and tropical thermocline depth is currently only backed up by data from the Pacific Ocean. In our paper, we present temperature, salinity, and thermocline records from the tropical Atlantic Ocean. Surprisingly, the Pliocene thermocline evolution was remarkably different in the Atlantic and Pacific. We need to reevaluate the mechanisms that drive thermocline depth, and how these are tied to global climate change.
Alice E. Webb, Didier M. de Bakker, Karline Soetaert, Tamara da Costa, Steven M. A. C. van Heuven, Fleur C. van Duyl, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 6501–6516, https://doi.org/10.5194/bg-18-6501-2021, https://doi.org/10.5194/bg-18-6501-2021, 2021
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
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Short summary
Here we report Mn / Ca ratios in living benthic foraminifera from the NE Japan margin. The results show that the Mn incorporation directly reflects the environment where the foraminifera calcify. Foraminifera that live deeper in sediment, under greater redox stress, generally incorporate more Mn into their carbonate skeletons. As such, foraminifera living close to the Mn reduction zone in sediment appear promising tools for paleoceanographic reconstructions of sedimentary redox conditions.
Here we report Mn / Ca ratios in living benthic foraminifera from the NE Japan margin. The...
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