Articles | Volume 15, issue 23
https://doi.org/10.5194/bg-15-7077-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-7077-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
29 Nov 2018
Research article |
| 29 Nov 2018
| 29 Nov 2018
Mg ∕ Ca and δ18O in living planktic foraminifers from the Caribbean, Gulf of Mexico and Florida Straits
Anna Jentzen
CORRESPONDING AUTHOR
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1–3,
24148 Kiel, Germany
Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz,
Germany
Dirk Nürnberg
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1–3,
24148 Kiel, Germany
Ed C. Hathorne
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1–3,
24148 Kiel, Germany
Joachim Schönfeld
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1–3,
24148 Kiel, Germany
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Data on past relative humidity (RH) ARE needed to improve its representation in Earth system models. A novel isotope parameter (17O-excess) of plant silica has been developed to quantify past RH. Using comprehensive monitoring and novel methods, we show how environmental and plant physiological parameters influence the 17O-excess of plant silica and leaf water, i.e. its source water. The insights gained from this study will help to improve estimates of RH from fossil plant silica deposits.
David J. Harning, Brooke Holman, Lineke Woelders, Anne E. Jennings, and Julio Sepúlveda
Biogeosciences, 20, 229–249, https://doi.org/10.5194/bg-20-229-2023, https://doi.org/10.5194/bg-20-229-2023, 2023
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In order to better reconstruct the geologic history of the North Water Polynya, we provide modern validations and calibrations of lipid biomarker proxies in Baffin Bay. We find that sterols, rather than HBIs, most accurately capture the current extent of the North Water Polynya and will be a valuable tool to reconstruct its past presence or absence. Our local temperature calibrations for GDGTs and OH-GDGTs reduce the uncertainty present in global temperature calibrations.
Jessica G. M. Crumpton-Banks, Thomas Tanner, Ivan Hernández Almeida, James W. B. Rae, and Heather Stoll
Biogeosciences, 19, 5633–5644, https://doi.org/10.5194/bg-19-5633-2022, https://doi.org/10.5194/bg-19-5633-2022, 2022
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Past ocean carbon is reconstructed using proxies, but it is unknown whether preparing ocean sediment for one proxy might damage the data given by another. We have tested whether the extraction of an organic proxy archive from sediment samples impacts the geochemistry of tiny shells also within the sediment. We find no difference in shell geochemistry between samples which come from treated and untreated sediment. This will help us to maximize scientific return from valuable sediment samples.
Pablo Forjanes, María Simonet Roda, Martina Greiner, Erika Griesshaber, Nelson A. Lagos, Sabino Veintemillas-Verdaguer, José Manuel Astilleros, Lurdes Fernández-Díaz, and Wolfgang W. Schmahl
Biogeosciences, 19, 3791–3823, https://doi.org/10.5194/bg-19-3791-2022, https://doi.org/10.5194/bg-19-3791-2022, 2022
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Aragonitic skeletons are employed to decipher past climate dynamics and environmental change. Unfortunately, the information that these skeletons keep can be destroyed during diagenesis. In this work, we study the first changes undergone by aragonitic skeletons upon hydrothermal alteration. We observe that major changes occur from the very beginning of the alteration, even without mineralogical changes. These results have major implications for the use of these archives to understand the past.
Inga Labuhn, Franziska Tell, Ulrich von Grafenstein, Dan Hammarlund, Henning Kuhnert, and Bénédicte Minster
Biogeosciences, 19, 2759–2777, https://doi.org/10.5194/bg-19-2759-2022, https://doi.org/10.5194/bg-19-2759-2022, 2022
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This study presents the isotopic composition of recent biogenic carbonates from several lacustrine species which calcify during different times of the year. The authors demonstrate that when biological offsets are corrected, the dominant cause of differences between species is the seasonal variation in temperature-dependent fractionation of oxygen isotopes. Consequently, such carbonates from lake sediments can provide proxy records of seasonal water temperature changes in the past.
Gerard J. M. Versteegh, Karin A. F. Zonneveld, Jens Hefter, Oscar E. Romero, Gerhard Fischer, and Gesine Mollenhauer
Biogeosciences, 19, 1587–1610, https://doi.org/10.5194/bg-19-1587-2022, https://doi.org/10.5194/bg-19-1587-2022, 2022
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A 5-year record of long-chain mid-chain diol export flux and composition is presented with a 1- to 3-week resolution sediment trap CBeu (in the NW African upwelling). All environmental parameters as well as the diol composition are dominated by the seasonal cycle, albeit with different phase relations for temperature and upwelling. Most diol-based proxies are dominated by upwelling. The long-chain diol index reflects temperatures of the oligotrophic summer sea surface.
Johannes Hepp, Christoph Mayr, Kazimierz Rozanski, Imke Kathrin Schäfer, Mario Tuthorn, Bruno Glaser, Dieter Juchelka, Willibald Stichler, Roland Zech, and Michael Zech
Biogeosciences, 18, 5363–5380, https://doi.org/10.5194/bg-18-5363-2021, https://doi.org/10.5194/bg-18-5363-2021, 2021
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Deriving more quantitative climate information like relative air humidity is one of the key challenges in paleostudies. Often only qualitative reconstructions can be done when single-biomarker-isotope data are derived from a climate archive. However, the coupling of hemicellulose-derived sugar with leaf-wax-derived n-alkane isotope results has the potential to overcome this limitation and allow a quantitative relative air humidity reconstruction.
Angelica Feurdean
Biogeosciences, 18, 3805–3821, https://doi.org/10.5194/bg-18-3805-2021, https://doi.org/10.5194/bg-18-3805-2021, 2021
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This study characterized the diversity of laboratory-produced charcoal morphological features of various fuel types from Siberia at different temperatures. The results obtained improve the attribution of charcoal particles to fuel types and fire characteristics. This work also provides recommendations for the application of this information to refine the past wildfire history.
Martin Tetard, Laetitia Licari, Ekaterina Ovsepyan, Kazuyo Tachikawa, and Luc Beaufort
Biogeosciences, 18, 2827–2841, https://doi.org/10.5194/bg-18-2827-2021, https://doi.org/10.5194/bg-18-2827-2021, 2021
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Oxygen minimum zones are oceanic regions almost devoid of dissolved oxygen and are currently expanding due to global warming. Investigation of their past behaviour will allow better understanding of these areas and better prediction of their future evolution. A new method to estimate past [O2] was developed based on morphometric measurements of benthic foraminifera. This method and two other approaches based on foraminifera assemblages and porosity were calibrated using 45 core tops worldwide.
Maximiliano Rodríguez and Christelle Not
Biogeosciences, 18, 1987–2001, https://doi.org/10.5194/bg-18-1987-2021, https://doi.org/10.5194/bg-18-1987-2021, 2021
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Mg/Ca in calcium carbonate shells of marine organisms such as foraminifera and ostracods has been used as a proxy to reconstruct water temperature. Here we provide new Mg/Ca–temperature calibrations for two shallow marine species of ostracods. We show that the water temperature in spring produces the best calibrations, which suggests the potential use of ostracod shells to reconstruct this parameter at a seasonal scale.
Hongrui Zhang, Chuanlian Liu, Luz María Mejía, and Heather Stoll
Biogeosciences, 18, 1909–1916, https://doi.org/10.5194/bg-18-1909-2021, https://doi.org/10.5194/bg-18-1909-2021, 2021
Delphine Dissard, Gert Jan Reichart, Christophe Menkes, Morgan Mangeas, Stephan Frickenhaus, and Jelle Bijma
Biogeosciences, 18, 423–439, https://doi.org/10.5194/bg-18-423-2021, https://doi.org/10.5194/bg-18-423-2021, 2021
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Results from a data set acquired from living foraminifera T. sacculifer collected from surface waters are presented, allowing us to establish a new Mg/Ca–Sr/Ca–temperature equation improving temperature reconstructions. When combining equations, δ18Ow can be reconstructed with a precision of ± 0.5 ‰, while successive reconstructions involving Mg/Ca and δ18Oc preclude salinity reconstruction with a precision better than ± 1.69. A new direct linear fit to reconstruct salinity could be established.
Feng Wang, Dominique Arseneault, Étienne Boucher, Shulong Yu, Steeven Ouellet, Gwenaëlle Chaillou, Ann Delwaide, and Lily Wang
Biogeosciences, 17, 4559–4570, https://doi.org/10.5194/bg-17-4559-2020, https://doi.org/10.5194/bg-17-4559-2020, 2020
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Wood stain is challenging the use of the blue intensity technique for dendroclimatic reconstructions. Using stained subfossil trees from eastern Canadian lakes, we compared chemical destaining approaches with the
delta bluemathematical correction of blue intensity data. Although no chemical treatment was completely efficient, the delta blue method is unaffected by the staining problem and thus is promising for climate reconstructions based on lake subfossil material.
Dulcinea V. Groff, David G. Williams, and Jacquelyn L. Gill
Biogeosciences, 17, 4545–4557, https://doi.org/10.5194/bg-17-4545-2020, https://doi.org/10.5194/bg-17-4545-2020, 2020
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Tussock grasses that grow along coastlines of the Falkland Islands are slow to decay and build up thick peat layers over thousands of years. Grass fragments found in ancient peat can be used to reconstruct past climate because grasses can preserve a record of growing conditions in their leaves. We found that modern living tussock grasses in the Falkland Islands reliably record temperature and humidity in their leaves, and the peat they form can be used to understand past climate change.
Maxence Guillermic, Sambuddha Misra, Robert Eagle, Alexandra Villa, Fengming Chang, and Aradhna Tripati
Biogeosciences, 17, 3487–3510, https://doi.org/10.5194/bg-17-3487-2020, https://doi.org/10.5194/bg-17-3487-2020, 2020
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Boron isotope ratios (δ11B) of foraminifera are a promising proxy for seawater pH and can be used to constrain pCO2. In this study, we derived calibrations for new foraminiferal taxa which extend the application of the boron isotope proxy. We discuss the origin of different δ11B signatures in species and also discuss the potential of using multispecies δ11B analyses to constrain vertical pH and pCO2 gradients in ancient water columns to shed light on biogeochemical carbon cycling in the past.
Zeynep Erdem, Joachim Schönfeld, Anthony E. Rathburn, Maria-Elena Pérez, Jorge Cardich, and Nicolaas Glock
Biogeosciences, 17, 3165–3182, https://doi.org/10.5194/bg-17-3165-2020, https://doi.org/10.5194/bg-17-3165-2020, 2020
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Recent observations from today’s oceans revealed that oxygen concentrations are decreasing, and oxygen minimum zones are expanding together with current climate change. With the aim of understanding past climatic events and their relationship with oxygen content, we looked at the fossils, called benthic foraminifera, preserved in the sediment archives from the Peruvian margin and quantified the bottom-water oxygen content for the last 22 000 years.
Hannah K. Donald, Gavin L. Foster, Nico Fröhberg, George E. A. Swann, Alex J. Poulton, C. Mark Moore, and Matthew P. Humphreys
Biogeosciences, 17, 2825–2837, https://doi.org/10.5194/bg-17-2825-2020, https://doi.org/10.5194/bg-17-2825-2020, 2020
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The boron isotope pH proxy is increasingly being used to reconstruct ocean pH in the past. Here we detail a novel analytical methodology for measuring the boron isotopic composition (δ11B) of diatom opal and apply this to the study of the diatom Thalassiosira weissflogii grown in culture over a range of pH. To our knowledge this is the first study of its kind and provides unique insights into the way in which diatoms incorporate boron and their potential as archives of palaeoclimate records.
Eleonora Fossile, Maria Pia Nardelli, Arbia Jouini, Bruno Lansard, Antonio Pusceddu, Davide Moccia, Elisabeth Michel, Olivier Péron, Hélène Howa, and Meryem Mojtahid
Biogeosciences, 17, 1933–1953, https://doi.org/10.5194/bg-17-1933-2020, https://doi.org/10.5194/bg-17-1933-2020, 2020
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This study focuses on benthic foraminiferal distribution in an Arctic fjord characterised by continuous sea ice production during winter and the consequent cascading of salty and corrosive waters (brine) to the seabed. The inner fjord is dominated by calcareous species (C). In the central deep basins, where brines are persistent, calcareous foraminifera are dissolved and agglutinated (A) dominate. The high A/C ratio is suggested as a proxy for brine persistence and sea ice production.
Johannes Hepp, Imke Kathrin Schäfer, Verena Lanny, Jörg Franke, Marcel Bliedtner, Kazimierz Rozanski, Bruno Glaser, Michael Zech, Timothy Ian Eglinton, and Roland Zech
Biogeosciences, 17, 741–756, https://doi.org/10.5194/bg-17-741-2020, https://doi.org/10.5194/bg-17-741-2020, 2020
Julian Struck, Marcel Bliedtner, Paul Strobel, Jens Schumacher, Enkhtuya Bazarradnaa, and Roland Zech
Biogeosciences, 17, 567–580, https://doi.org/10.5194/bg-17-567-2020, https://doi.org/10.5194/bg-17-567-2020, 2020
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We present leaf wax n-alkanes and their compound-specific (CS) δ13C isotopes from semi-arid and/or arid Mongolia to test their potential for paleoenvironmental reconstructions. Plants and topsoils were analysed and checked for climatic control. Chain-length variations are distinct between grasses and Caragana, which are not biased by climate. However CS δ13C is strongly correlated to climate, so n-alkanes and their CS δ13C show great potential for paleoenvironmental reconstruction in Mongolia.
Elena Lo Giudice Cappelli, Jessica Louise Clarke, Craig Smeaton, Keith Davidson, and William Edward Newns Austin
Biogeosciences, 16, 4183–4199, https://doi.org/10.5194/bg-16-4183-2019, https://doi.org/10.5194/bg-16-4183-2019, 2019
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Fjords are known sinks of organic carbon (OC); however, little is known about the long-term fate of the OC stored in these sediments. The reason for this knowledge gap is the post-depositional degradation of OC. This study uses benthic foraminifera (microorganisms with calcite shells) to discriminate between post-depositional OC degradation and actual OC burial and accumulation in fjordic sediments, as foraminifera would only preserve the latter information in their assemblage composition.
Sara K. E. Goulden, Naohiko Ohkouchi, Katherine H. Freeman, Yoshito Chikaraishi, Nanako O. Ogawa, Hisami Suga, Oliver Chadwick, and Benjamin Z. Houlton
Biogeosciences, 16, 3869–3882, https://doi.org/10.5194/bg-16-3869-2019, https://doi.org/10.5194/bg-16-3869-2019, 2019
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We investigate whether soil organic compounds preserve information about nitrogen availability to plants. We isolate chlorophyll degradation products in leaves, litter, and soil and explore possible species and climate effects on preservation and interpretation. We find that compound-specific nitrogen isotope measurements in soil have potential as a new tool to reconstruct changes in nitrogen cycling on a landscape over time, avoiding issues that have limited other proxies.
Nicolai Schleinkofer, Jacek Raddatz, André Freiwald, David Evans, Lydia Beuck, Andres Rüggeberg, and Volker Liebetrau
Biogeosciences, 16, 3565–3582, https://doi.org/10.5194/bg-16-3565-2019, https://doi.org/10.5194/bg-16-3565-2019, 2019
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In this study we tried to correlate Na / Ca ratios from cold-water corals with environmental parameters such as salinity, temperature and pH. We do not observe a correlation between Na / Ca ratios and seawater salinity, but we do observe a strong correlation with temperature. Na / Ca data from warm-water corals (Porites spp.) and bivalves (Mytilus edulis) support this correlation, indicating that similar controls on the incorporation of sodium exist in these aragonitic organisms.
Mattia Greco, Lukas Jonkers, Kerstin Kretschmer, Jelle Bijma, and Michal Kucera
Biogeosciences, 16, 3425–3437, https://doi.org/10.5194/bg-16-3425-2019, https://doi.org/10.5194/bg-16-3425-2019, 2019
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To be able to interpret the paleoecological signal contained in N. pachyderma's shells, its habitat depth must be known. Our investigation on 104 density profiles of this species from the Arctic and North Atlantic shows that specimens reside closer to the surface when sea-ice and/or surface chlorophyll concentrations are high. This is in contrast with previous investigations that pointed at the position of the deep chlorophyll maximum as the main driver of N. pachyderma vertical distribution.
Anna Mikis, Katharine R. Hendry, Jennifer Pike, Daniela N. Schmidt, Kirsty M. Edgar, Victoria Peck, Frank J. C. Peeters, Melanie J. Leng, Michael P. Meredith, Chloe L. C. Jones, Sharon Stammerjohn, and Hugh Ducklow
Biogeosciences, 16, 3267–3282, https://doi.org/10.5194/bg-16-3267-2019, https://doi.org/10.5194/bg-16-3267-2019, 2019
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Antarctic marine calcifying organisms are threatened by regional climate change and ocean acidification. Future projections of regional carbonate production are challenging due to the lack of historical data combined with complex climate variability. We present a 6-year record of flux, morphology and geochemistry of an Antarctic planktonic foraminifera, which shows that their growth is most sensitive to sea ice dynamics and is linked with the El Niño–Southern Oscillation.
Eunmi Park, Jens Hefter, Gerhard Fischer, Morten Hvitfeldt Iversen, Simon Ramondenc, Eva-Maria Nöthig, and Gesine Mollenhauer
Biogeosciences, 16, 2247–2268, https://doi.org/10.5194/bg-16-2247-2019, https://doi.org/10.5194/bg-16-2247-2019, 2019
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We analyzed GDGT-based proxy temperatures in the polar oceans. In the eastern Fram Strait (79° N), the nutrient distribution may determine the depth habit of Thaumarchaeota and thus the proxy temperature. In the Antarctic Polar Front (50° S), the contribution of Euryarchaeota or the nonlinear correlation between the proxy values and temperatures may cause the warm biases of the proxy temperatures relative to SSTs.
Marijke W. de Bar, Jenny E. Ullgren, Robert C. Thunnell, Stuart G. Wakeham, Geert-Jan A. Brummer, Jan-Berend W. Stuut, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 16, 1705–1727, https://doi.org/10.5194/bg-16-1705-2019, https://doi.org/10.5194/bg-16-1705-2019, 2019
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We analyzed sediment traps from the Cariaco Basin, the tropical Atlantic and the Mozambique Channel to evaluate seasonal imprints in the concentrations and fluxes of long-chain diols (LDIs), in addition to the long-chain diol index proxy (sea surface temperature proxy) and the diol index (upwelling indicator). Despite significant degradation, LDI-derived temperatures were very similar for the sediment traps and seafloor sediments, and corresponded to annual mean sea surface temperatures.
Jens Zinke, Juan P. D'Olivo, Christoph J. Gey, Malcolm T. McCulloch, J. Henrich Bruggemann, Janice M. Lough, and Mireille M. M. Guillaume
Biogeosciences, 16, 695–712, https://doi.org/10.5194/bg-16-695-2019, https://doi.org/10.5194/bg-16-695-2019, 2019
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Here we report seasonally resolved sea surface temperature (SST) reconstructions for the southern Mozambique Channel in the SW Indian Ocean, a region located along the thermohaline ocean surface circulation route, based on multi-trace-element temperature proxy records preserved in two Porites sp. coral cores for the past 42 years. Particularly, we show the suitability of both separate and combined Sr / Ca and Li / Mg proxies for improved multielement SST reconstructions.
Hilde Pracht, Brett Metcalfe, and Frank J. C. Peeters
Biogeosciences, 16, 643–661, https://doi.org/10.5194/bg-16-643-2019, https://doi.org/10.5194/bg-16-643-2019, 2019
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In palaeoceanography the shells of single-celled foraminifera are routinely used as proxies to reconstruct the temperature, salinity and circulation of the ocean in the past. Traditionally a number of specimens were pooled for a single stable isotope measurement; however, technical advances now mean that a single shell or chamber of a shell can be measured individually. Three different hypotheses regarding foraminiferal biology and ecology were tested using this approach.
Shauna Ní Fhlaithearta, Christophe Fontanier, Frans Jorissen, Aurélia Mouret, Adriana Dueñas-Bohórquez, Pierre Anschutz, Mattias B. Fricker, Detlef Günther, Gert J. de Lange, and Gert-Jan Reichart
Biogeosciences, 15, 6315–6328, https://doi.org/10.5194/bg-15-6315-2018, https://doi.org/10.5194/bg-15-6315-2018, 2018
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This study looks at how foraminifera interact with their geochemical environment in the seabed. We focus on the incorporation of the trace metal manganese (Mn), with the aim of developing a tool to reconstruct past pore water profiles. Manganese concentrations in foraminifera are investigated relative to their ecological preferences and geochemical environment. This study demonstrates that Mn in foraminiferal tests is a promising tool to reconstruct oxygen conditions in the seabed.
Siobhan Williams, Walter Adey, Jochen Halfar, Andreas Kronz, Patrick Gagnon, David Bélanger, and Merinda Nash
Biogeosciences, 15, 5745–5759, https://doi.org/10.5194/bg-15-5745-2018, https://doi.org/10.5194/bg-15-5745-2018, 2018
Robert Frei, Cora Paulukat, Sylvie Bruggmann, and Robert M. Klaebe
Biogeosciences, 15, 4905–4922, https://doi.org/10.5194/bg-15-4905-2018, https://doi.org/10.5194/bg-15-4905-2018, 2018
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The reconstruction of paleo-redox conditions of seawater has the potential to link to climatic changes on land and therefore to contribute to our understanding of past climate change. The redox-sensitive chromium isotope system is applied to marine calcifiers in order to characterize isotope offsets that result from vital processes during calcification processes and which can be eventually used in fossil equivalents to reconstruct past seawater compositions.
Thomas M. DeCarlo, Michael Holcomb, and Malcolm T. McCulloch
Biogeosciences, 15, 2819–2834, https://doi.org/10.5194/bg-15-2819-2018, https://doi.org/10.5194/bg-15-2819-2018, 2018
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Understanding the mechanisms of coral calcification is limited by the isolation of the calcifying environment. The boron systematics (B / Ca and δ11B) of aragonite have recently been developed as a proxy for the carbonate chemistry of the calcifying fluid, but a variety of approaches have been utilized. We assess the available experimental B / Ca partitioning data and present a computer code for deriving calcifying fluid carbonate chemistry from the boron systematics of coral skeletons.
Manuel Bringué, Robert C. Thunell, Vera Pospelova, James L. Pinckney, Oscar E. Romero, and Eric J. Tappa
Biogeosciences, 15, 2325–2348, https://doi.org/10.5194/bg-15-2325-2018, https://doi.org/10.5194/bg-15-2325-2018, 2018
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We document 2.5 yr of dinoflagellate cyst production in the Cariaco Basin using a sediment trap record. Each species' production pattern is interpreted in the context of the physico-chemical (e.g., temperature, nutrients) and biological (other planktonic groups) environment. Most species respond positively to upwelling, but seem to be negatively impacted by an El Niño event with a 1-year lag. This work helps understanding dinoflagellate ecology and interpreting fossil assemblages in sediments.
Gabriella M. Weiss, Eva Y. Pfannerstill, Stefan Schouten, Jaap S. Sinninghe Damsté, and Marcel T. J. van der Meer
Biogeosciences, 14, 5693–5704, https://doi.org/10.5194/bg-14-5693-2017, https://doi.org/10.5194/bg-14-5693-2017, 2017
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Algal-derived compounds allow us to make assumptions about environmental conditions in the past. In order to better understand how organisms record environmental conditions, we grew microscopic marine algae at different light intensities, salinities, and alkalinities in a temperature-controlled environment. We determined how these environmental parameters affected specific algal-derived compounds, especially their relative deuterium content, which seems to be mainly affected by salinity.
S. Nemiah Ladd, Nathalie Dubois, and Carsten J. Schubert
Biogeosciences, 14, 3979–3994, https://doi.org/10.5194/bg-14-3979-2017, https://doi.org/10.5194/bg-14-3979-2017, 2017
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Hydrogen isotopes of lipids provide valuable information about microbial activity, climate, and environmental stress. We show that heavy hydrogen in fatty acids declines from spring to summer in a nutrient-rich and a nutrient-poor lake and that the effect is nearly 3 times as big in the former. This effect is likely a combination of increased biomass from algae, warmer temperatures, and higher algal growth rates.
Karoliina A. Koho, Lennart J. de Nooijer, Christophe Fontanier, Takashi Toyofuku, Kazumasa Oguri, Hiroshi Kitazato, and Gert-Jan Reichart
Biogeosciences, 14, 3067–3082, https://doi.org/10.5194/bg-14-3067-2017, https://doi.org/10.5194/bg-14-3067-2017, 2017
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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.
Stefania Milano, Gernot Nehrke, Alan D. Wanamaker Jr., Irene Ballesta-Artero, Thomas Brey, and Bernd R. Schöne
Biogeosciences, 14, 1577–1591, https://doi.org/10.5194/bg-14-1577-2017, https://doi.org/10.5194/bg-14-1577-2017, 2017
Cited articles
Anand, P., Elderfield, H., and Conte, M. H.: Calibration of
Mg ∕ Ca thermometry in planktonic foraminifera from a
sediment trap time series, Paleoceanography, 18, 1050,
https://doi.org/10.1029/2002PA000846, 2003.
Barker, S., Greaves, M., and Elderfield, H.: A study of cleaning procedures
used for foraminiferal Mg ∕ Ca paleothermometry,
Geochem. Geophy. Geosy., 4, 8407, https://doi.org/10.1029/2003GC000559,
2003.
Bé, A. W. H.: Families: Globigerinidae and Globorotaliidae, Fiche no.
108, in: Fiches d`intification du zooplankton, edited by: Frasier, J. H.,
Conseil International pour l`Exploration de la Mer, Lamont Geological Observatory of Columbia University, Palisades, New York, 1967.
Bé, A. W. H.: An ecological, zoogeographic and taxonomic review of
recent planktonic foraminifera, in: Oceanic Micropaleontology, edited by:
Ramsay, A. T. S., Academic Press, London, 1977.
Bé, A. W. H.: Gametogenic calcification in a spinose planktonic
foraminifer, Globigerinoides sacculifer (Brady), Mar. Micropaleontol., 5, 283–310, 1980.
Bé, A. W. H. and Anderson, O. R.: Gametogenesis in planktonic
foraminifera, Science, 192, 890–892, 1976.
Bemis, B. E., Spero, H. J., Bijma, J., and Lea, D. W.: Reevaluation of the
oxygen isotopic composition of planktonic foraminifera: Experimental results
and revised paleotemperature equations, Paleoceanography, 13, 150–160,
https://doi.org/10.1029/98PA00070, 1998.
Bentov, S. and Erez, J.: Impact of biomineralization processes on the Mg
content of foraminiferal shells: A biological perspective, Geochem. Geophy. Geosy., 7, Q01P08, https://doi.org/10.1029/2005GC001015, 2006.
Bijma, J., Spero, H. J., and Lea, D. W.: Reassessing foraminiferal stable
isotope geochemistry: Impact of the oceanic carbonate system (experimental
results), in: Use of proxies in paleoceanography, edited by: Fischer, G.
and Wefer, G., Springer Berlin, Heidelberg, 489–512, 1999.
Birch, H., Coxall, H. K., Pearson, P. N., Kroon, D., and O'Regan, M.: Planktonic foraminifera stable isotopes and water column
structure: Disentangling ecological signals, Mar. Micropaleontol., 101,
127–145, 2013.
Blanke, B., Arhan, M., Lazar, A., and Prévost, G.: A Lagrangian
numerical investigation of the origins and fates of the salinity maximum
water in the Atlantic, J. Geophys. Res., 107, 3163,
https://doi.org/10.1029/2002JC001318, 2002.
Bouvier-Soumagnac, Y. and Duplessy, J. C.: Carbon and oxygen isotopic
composition of planktonic foraminifera from laboratory culture, plankton
tows and Recent sediment: implications for the reconstruction of
paleoclimatic conditions and of the global carbon cycle, J. Foramin. Res., 15, 302–320, 1985.
Bouvier-Soumagnac, Y., Duplessy, J. C., and Bé, A. W. H.: Isotopic
composition of a laboratory cultured planktonic foraminifer O. universa, Implications
for paleoclimatic reconstructions, Oceanol. Acta, 9, 519–522, 1986.
Brown, S. J. and Elderfield, H.: Variations in Mg ∕ Ca and
Sr ∕ Ca ratios of planktonic foraminifera caused by postdepositional
dissolution: Evidence of shallow Mg-dependent dissolution, Paleoceanography,
11, 543–551, https://doi.org/10.1029/96PA01491, 1996.
Chérubin, L. M. and Richardson, P.: Caribbean current variability and the
influence of the Amazon and Orinoco fresh water plumes, Deep-Sea Res. Pt. 1, 54, 1451–1473, 2007.
Cléroux, C., Cortijo, E., Anand, P., Labeyrie, L., Bassinot, F., Caillon,
N., and Duplessy, J.-C.: Mg ∕ Ca and Sr ∕ Ca ratios in
planktonic foraminifera: Proxies for upper water column temperature
reconstruction, Paleoceanography, 23, PA3214, https://doi.org/10.1029/2007PA001505, 2008.
Craig, H. and Gordon, L. I.: Deuterium and oxygen 18 variations in the ocean
and the marine atmosphere, in: Stable Isotopes in Oceanographic Studies and
Paleotemperatures, edited by: Tongiorgi, E., Spoleto, 9–130,
Consiglio Nazionale Delle Ricerche Laboratorio di Geologia Nucleare, Pisa, 1965.
Deuser, W. G., Ross, E. H., Hemleben, C., and Spindler, M.: Seasonal changes
in species composition, numbers, mass, size, and isotopic composition of
planktonic foraminifera settling into the deep Sargasso Sea,
Palaeogeogr. Palaeocl., 33, 103–127, 1981.
Dueñas-Bohórquez, A., da Rocha, R. E., Kuroyanagi, A., de Nooijer,
L. J., Bijma, J., and Reichart, G.-J.: Interindividual variability and
ontogenetic effects on Mg and Sr incorporation in the planktonic foraminifer
Globigerinoides sacculifer, Geochim. Cosmochim. Ac., 75, 520–532, 2011.
Dickson, A. G.: Thermodynamics of the Dissociation of Boric Acid in
Synthetic Seawater from 273.15 to 318.15 K, Deep-Sea Res., 37, 755–766, 1990.
Dickson, A. G. and Millero, F. J.: A Comparison of the Equilibrium
Constants for the Dissociation of Carbonic Acid in Seawater Media, Deep-Sea Res., 34, 1733–1743, 1987.
Duplessy, J. C., Bé, A. W. H., and Blanc, P. L.: Oxygen and carbon
isotopic composition and biogeographic distribution of planktonic
foraminifera in the Indian Ocean, Palaeogeogr. Palaeocl., 33, 9–46, 1981a.
Duplessy, J. C., Blanc, P. L., and Bé, A. W. H.: Oxygen-18 enrichment of
planktonic foraminifera due to gametogenic calcification below the euphotic
zone, Science, 213, 1247–1250, 1981b.
Eggins, S. M., Sadekov, A., and De Deckker, P.: Modulation and daily banding
of Mg ∕ Ca in Orbulina universa tests by symbiont
photosynthesis and respiration: a complication for seawater thermometry?,
Earth Planet. Sc. Lett., 225, 411–419, 2004.
Erez, J.: The source of ions for biomineralization in foraminifera and their
implications for paleoceanographic proxies, Rev. Mineral. Geochem., 54, 115–149, 2003.
Erez, J. and Honjo, S.: Comparison of isotopic composition of planktonic
foraminifera in plankton tows, sediment traps and sediments,
Palaeogeogr. Palaeocl., 33, 129–156, 1981.
Erez, J. and Luz, B.: Experimental paleotemperature equation for planktonic
foraminifera, Geochim. Cosmochim. Ac., 47, 1025–1031, 1983.
Fairbanks, R. G., Sverdlove, M., Free, R., Wiebe, P. H., and Bé, A. W.
H.: Vertical distribution and isotopic fractionation of living planktonic
foraminifera from the Panama Basin, Nature, 298, 841–844, 1982.
Fehrenbacher, J. S., Russell, A. D., Davis, C. V., Gagnon, A. C., Spero, H. J.,
Cliff, J. B., Zhu, Z., and Martin, P.: Link between light-triggered
Mg-banding and chamber formation in the planktic foraminifera
Neogloboquadrina dutertrei, Nat. Commun., 8, 15441, https://doi.org/10.1038/ncomms15441,
2017.
Franco-Fraguas, P., Costa, K. B., and Toledo, F. A. D. L.: Relationship
between isotopic composition (Δ18O and Δ13C) and
planktonic foraminifera test size in core tops from the Brazilian
Continental Margin, Braz. J. Oceanogr., 59, 327–338, 2011.
Gallegos, A.: Descriptive physical oceanography of the Caribbean Sea, in:
Small Islands: Marine Science and Sustainable Development, edited by: Maul,
G. A., Coast. Estuar. Stud., 51, 36–55, 1996.
Gastrich, M. D.: Ultrastructure of a new intracellular symbiotic alga found
within planktonic foraminifera, J. Phycol., 23, 623–632, 1987.
Greaves, M., Caillon, N., Rebaubier, H., Bartoli, G., Bohaty, S., Cacho, I.,
Clarke, L., Cooper, M., Daunt, C., Delaney, M., deMenocal, P., Dutton, A.,
Eggins, S., Elderfield, H., Garbe-Schönberg, D., Goddard, E., Green, D.,
Groeneveld, J., Hastings, D., Hathorne, E., Kimoto, K., Klinkhammer, G.,
Labeyrie, L., Lea, D. W., Marchitto, T., Martinez-Boti, M. A., Mortyn, P. G.,
Ni, Y., Nürnberg, D., Paradis, G., Pena, L., Quinn, T., Rosenthal, Y.,
Russell, A., Sagawa, T., Sosdian, S., Stott, L., Tachikawa, K., Tappa, E.,
Thunell, R., and Wilson, P. A.: Interlaboratory comparison study of
calibration standards for foraminiferal Mg ∕ Ca
thermometry, Geochem. Geophy. Geosy., 9, Q08010,
https://doi.org/10.1029/2008GC001974, 2008.
Hamilton, C. P., Spero, H. J., Bijma, J., and Lea, D. W.: Geochemical
investigation of gametogenic calcite addition in the planktonic foraminifera
Orbulina universa, Mar. Micropaleontol., 68, 256–267, 2008.
Hathorne, E. C., James, R. H., and Lampitt, R. S.: Environmental versus
biomineralization controls on the intratest variation in the trace element
composition of the planktonic foraminifera G. inflata and G. scitula, Paleoceanography, 24,
PA4204, https://doi.org/10.1029/2009PA001742, 2009.
Hathorne, E. C., Gagnon, A., Felis, T., Adkins, J., Asami, R., Boer, W.,
Caillon, N., Case, D., Cobb, K. M., Douville, E., deMenocal, P., Eisenhauer,
A., Garbe-Schoönberg, D., Geibert, W., Goldstein, S.,
Hughen, K., Inoue, M., Kawahata, H., Kölling, M., Cornec,
F. L., Linsley, B. K., McGregor, H. V., Montagna, P., Nurhati, I. S., Quinn,
T. M., Raddatz, J., Rebaubier, H., Robinson, L., Sadekov, A., Sherrell, R.,
Sinclair, D., Tudhope, A. W., Wei, G., Wong, H., Wu, H. C., and You, C.-F.:
Interlaboratory study for coral Sr ∕ Ca and other element ∕ Ca ratio
measurements, Geochem. Geophy. Geosy., 14, 3730–3750,
https://doi.org/10.1002/ggge.20230, 2013.
Hemleben, C., Spindler, M., Breitinger, I., and Deuser, W. G.: Field and
laboratory studies on the ontogeny and ecology of some Globorotaliid species
from the Sargasso Sea off Bermuda, J. Foramin. Res., 15,
254–272, 1985.
Hut, G.: Stable isotope reference samples for geochemical and hydrological
investigations, Consultants Group meeting 16–18 September 1985, International
Atomic Energy Agency (I.A.E.A.), Vienna, Austria, p. 42, 1987.
Jansen, H., Zeebe, R. E., and Wolf-Gladrow, D. A.: Modeling the dissolution
of settling CaCO3 in the ocean, Global Biogeochem. Cy., 16, 1027,
https://doi.org/10.1029/2000GB001279, 2002.
Jentzen, A., Schönfeld, J., and Schiebel, R.: Assessment of the effect
of increasing temperature on the ecology and assemblage structure of modern
planktic foraminifers in the Caribbean and surrounding seas, J. Foramin. Res., 48, 251–272, 2018.
Jochum, K. P., Weis, U., Stoll, B., Kuzmin, D., Yang, Q., Raczek, I., Jacob,
D. E., Stracke, A., Birbaum, K., Frick, D. A., Günther,
D., and Enzweiler, J.: Determination of reference values for NIST SRM
610–617 glasses following ISO Guidelines, Geostand. Geoanal. Res., 35, 397–429, 2011.
Jørgensen, B. B., Erez, J., Revsbech, N. P., and Cohen, Y.: Symbiotic
photosynthesis in a planktonic foraminiferan, Globigerinoids sacculifer (Brady), studied with
microelectrodes, Limnol. Oceanogr., 30, 1253–1267,
https://doi.org/10.4319/lo.1985.30.6.1253, 1985.
Kahn, M. I.: Non-equilibrium oxygen and carbon isotopic fractionation in
tests of living planktonic foraminifera, Oceanol. Acta, 2, 195–208,
1979.
Kahn, M. I. and Williams, D. F.: Oxygen and carbon isotopic composition of
living foraminifera from the northeast Pacific Ocean, Palaeogeogr. Palaeocl., 33, 47–69, 1981.
Kim, S.-T. and O'Neil, J. R.: Equilibrium and nonequilibrium
oxygen isotope effects in synthetic carbonates, Geochim. Cosmochim. Ac., 61, 3461–3475, 1997.
Kisakürek, B., Eisenhauer, A., Böhm, F., Garbe-Schönberg, D., and
Erez, J.: Controls on shell Mg ∕ Ca and Sr ∕ Ca in cultured
planktonic foraminiferan, Globigerinoides ruber (white), Earth Planet. Sc. Lett., 273, 260–269, 2008.
Kozdon, R., Ushikubo, T., Kita, N. T., Spicuzza, M., and Valley, J. W.: Intratest
oxygen isotope variability in the planktonic foraminifer N. pachyderma: Real vs. apparent
vital effects by ion microprobe, Chem. Geol., 258, 327–337, 2009.
Kroon, D. and Darling, K.: Size and upwelling control of the stable isotope
composition of Neogloboquadrina dutertrei (d'Orbigny), Globigerinoides ruber (d'Orbigny) and
Globigerina bulloides d'Orbigny: Examples from the Panama Basin and Arabian Sea,
J. Foramin. Res., 25, 39–52, 1995.
Kučera, M.: Planktonic foraminifera as tracers of past oceanic
environments, in: Developments in Marine Geology, Proxies in Late Cenozoic
Paleoceanography, edited: by Hillaire-Marcel, C. and De Vernal, A.,
Elsevier, New York, 2007.
Kunioka, D., Shirai, K, Takahata, N., Sano, Y., Toyofuku, T., and Ujiie, Y.:
Microdistribution of Mg ∕ Ca, Sr ∕ Ca, and Ba ∕ Ca ratios in
Pulleniatina obliquiloculata test by using a NanoSIMS: Implication
for the vital effect mechanism, Geochem. Geophy. Geosy., 7,
Q12P20, https://doi.org/10.1029/2006GC001280, 2006.
Lea, D. W., Mashiotta, T. A., and Spero, H. J.: Controls on magnesium and
strontium uptake in planktonic foraminifera determined by live culturing,
Geochim. Cosmochim. Ac., 63, 2369–2379, 1999.
Lea, D. W., Pak, D. K., and Spero, H. J.: Climate impact of late Quaternary
equatorial Pacific sea surface temperature variations, Science, 289,
1719–1724, 2000.
Lin, H.-L., Sheu, D. D.-D., Yang, Y., Chou, W.-C., and Hung, G.-W.: Stable
isotopes in modern planktonic foraminifera: Sediment trap and plankton tow
results from the South China Sea, Mar. Micropaleontol., 79, 15–23,
2011.
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H.
E., Baranova, O. K., Zweng, M. M., Paver, C. R., Reagan, J. R., Johnson, D.
R., Hamilton, M., and Seidov, D.: World Ocean Atlas 2013, Volume 1:
Temperature, in: NOAA Atlas NESDIS 73, edited by: Levitus, S. and Mishonov,
A., Silver Spring, Maryland, 2013.
Lohmann, G. P. and Schweitzer, P. N.: Globorotalia truncatulinoides Growth and chemistry as probes of the
past thermocline: 1. Shell size, Paleoceanography, 5, 55–75, 1990.
Lončarić, N., Peeters, F. J. C., Kroon, D., and Brummer, G. J. A.:
Oxygen isotope ecology of recent planktic foraminifera at the central Walvis
Ridge (SE Atlantic), Paleoceanography, 21, PA3009, https://doi.org/10.1029/2005PA001207,
2006.
McConnaughey, T.: 13C and 18O isotopic disequilibrium in
biological carbonates: I. Patterns, Geochim. Cosmochim. Ac. 53,
151–162, 1989.
Mehrbach, C., Culberson, C. H., Hawley, J. E., and Pytkowicz, R. M.:
Measurement of the apparent dissociation-constants of carbonic-acid in
seawater at atmospheric pressure, Limnol. Oceanogr., 18, 897–907,
https://doi.org/10.4319/lo.1973.18.6.0897, 1973.
Metcalfe, B., Feldmeijer, W., de Vringer-Picon, M., Brummer, G.-J. A.,
Peeters, F. J. C., and Ganssen, G. M.: Late Pleistocene glacial-interglacial
shell-size-isotope variability in planktonic foraminifera as a function of
local hydrography, Biogeosciences, 12, 4781–4807,
https://doi.org/10.5194/bg-12-4781-2015, 2015.
Morel, A., Claustre, H., and Gentili, B.: The most oligotrophic subtropical
zones of the global ocean: similarities and differences in terms of
chlorophyll and yellow substance, Biogeosciences, 7, 3139–3151,
https://doi.org/10.5194/bg-7-3139-2010, 2010.
Morrison, J. M. and Nowlin, W. D.: General distribution of water masses
within the eastern Caribbean Sea during the winter of 1972 and fall of 1973,
J. Geophys. Res., 87, 4207–4229,
https://doi.org/10.1029/JC087iC06p04207, 1982.
Müller-Karger, F. E., McClain, C. R., Fisher, T. R., Esaias, W. E., and
Varela, R.: Pigment distribution in the Caribbean Sea: Observations from
space, Prog. Oceanogr., 23, 23–64, 1989.
Nürnberg, D.: Magnesium in tests of Neogloboquadrina pachyderma sinistral from high northern and
southern latitudes, J. Foramin. Res., 25, 350–368, 1995.
Nürnberg, D., Bijma, J., and Hemleben, C.: Assessing the reliability of
magnesium in foraminiferal calcite as a proxy for water mass temperatures,
Geochim. Cosmochim. Ac., 60, 803–814, 1996.
Nürnberg, D., Müller, A., and Schneider, R. R.: Paleo-sea surface
temperature calculations in the equatorial east Atlantic from
Mg ∕ Ca ratios in planktic foraminifera: A comparison to
sea surface temperature estimates from U
Nürnberg, D., Schönfeld, J., Dullo, W. C., and Rühlemann, C.: RV
SONNE cruise report SO164 RASTA: Rapid climate changes in the western
tropical Atlantic – Assessment of the biogenous and sedimentary record,
Balboa-Balboa, 22 May–28 June 2002, GEOMAR-Report 109, 1–151, 2003.
Nürnberg, D., Ziegler, M., Karas, C., Tiedemann, R., and Schmidt, M. W.:
Interacting Loop Current variability and Mississippi River discharge over
the past 400 kyr, Earth Planet. Sc. Lett., 272, 278–289, 2008.
Orr, W. N.: Secondary calcification in the foraminiferal genus Globorotalia,
Science, 157, 1554–1555, 1967.
Pak, D. K., Lea, D. W., and Kennett, J. P.: Seasonal and interannual
variation in Santa Barbara Basin water temperatures observed in sediment trap
foraminiferal Mg ∕ Ca, Geochem. Geophy. Geosy., 5, Q12008, https://doi.org/10.1029/2004GC000760, 2004.
Pierrot, D., Lewis, E., and Wallace, D. W. R.: MS Excel Program Developed
for CO2 System Calculations, ORNL/CDIAC-105a, Carbon Dioxide Information
Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy,
Oak Ridge, Tennessee, 2006.
Poore, R. Z., Tedesco, K. A., and Spear, J. W.: Seasonal flux and assemblage
composition of planktic foraminifers from a sediment-trap study in the
northern Gulf of Mexico, J. Coastal Res., 63, 6–19, 2013.
Regenberg, M., Nürnberg, D., Steph, S., Groeneveld, J.,
Garbe-Schönberg, D., Tiedemann, R., and Dullo, W. C.: Assessing the
effect of dissolution on planktonic foraminiferal Mg ∕ Ca
ratios: Evidence from Caribbean core tops, Geochem. Geophy. Geosy. 7, Q07P15, https://doi.org/10.1029/2005GC001019, 2006.
Regenberg, M., Steph, S., Nürnberg, D., Tiedemann, R., and
Garbe-Schönberg, D.: Calibrating Mg ∕ Ca ratios of
multiple planktonic foraminiferal species with
δ18O-calcification temperatures: Paleothermometry for the
upper water column, Earth Planet. Sc. Lett., 278, 324–336, 2009.
Regenberg, M., Regenberg, A., Garbe-Schönberg, D., and Lea, D. W.: Global
dissolution effects on planktonic foraminiferal Mg ∕ Ca
ratios controlled by the calcite-saturation state of bottom waters,
Paleoceanography, 29, 127–142, https://doi.org/10.1002/2013PA002492, 2014.
Rink, S., Kühl, M., Bijma, J., and Spero, H. J.: Microsensor studies of
photosynthesis and respiration in the symbiotic foraminifer Orbulina universa, Mar. Biol., 131, 583–595, 1998.
Rosenthal, Y., Lohmann, G. P., Lohmann, K. C., and Sherrell, R. M.:
Incorporation and preservation of Mg in Globigerinoides sacculifer:
Implications for reconstructing the temperature and 18O ∕ 16O of
seawater, Paleoceanography, 15, 135–145, https://doi.org/10.1029/1999PA000415, 2000.
Russell, A. D., Hönisch, B., Spero, H. J., and Lea, D. W.: Effects of
seawater carbonate ion concentration and temperature on shell U, Mg, and Sr
in cultured planktonic foraminifera, Geochim. Cosmochim. Ac., 68,
4347–4361, 2004.
Sadekov, A. Y., Eggins, S. M., and De Deckker, P.: Characterization of
Mg ∕ Ca distributions in planktonic foraminifera species by
electron microprobe mapping, Geochem. Geophy. Geosy., 6, Q12P06,
https://doi.org/10.1029/2005GC000973, 2005.
Sadekov, A. Y., Eggins, S. M., De Deckker, P., Ninnemann, U., Kuhnt, W., and
Bassinot, F.: Surface and subsurface seawater temperature reconstruction
using Mg ∕ Ca microanalysis of planktonic foraminifera
Globigerinoides ruber, Globigerinoides sacculifer, and
Pulleniatina obliquiloculata, Paleoceanography, 24, PA3201,
https://doi.org/10.1029/2008PA001664, 2009.
Schiebel, R. and Hemleben, C.: Planktic Foraminifers in the Modern Ocean,
Springer-Verlag, Berlin, Heidelberg, 2017.
Schlitzer, R.: Ocean data view, available at: http://odv.awi.de (last access: 21 November 2018), 2009.
Schmidt, G. A.: Error analysis of paleosalinity calculations,
Paleoceanography, 14, 422–429, https://doi.org/10.1029/1999PA900008, 1999.
Schmidt, G. A., Bigg, G. R., and Rohling, E. J.: Global Seawater Oxygen-18
Database – v1.21, available at: http://data.giss.nasa.gov/o18data (last access: 21 November 2018), 1999.
Schmidt, M. W., Spero, H. J., and Lea, D. W.: Links between salinity
variation in the Caribbean and North Atlantic thermohaline circulation,
Nature, 428, 160–163, https://doi.org/10.1038/nature02346, 2004.
Schönfeld, J., Bahr, A., Bannert, B., Bayer, A. S., Bayer, M., Beer, C.,
Blanz, T., Dullo, W. C., Flögel, S., Garlichs, T., Haley, B.,
Hübscher, C., Joseph, N., Kučera, M., Langenbacher, J.,
Nürnberg, D., Ochsenhirt, W. T., Petersen, A., Pulm, P., Titschack, J.,
and Troccoli, L.: Surface and Intermediate water hydrography, planktonic and
benthic biota in the Caribbean Sea – Climate, Bio and Geosphere linkages
(OPOKA), Cruise No. 78, Leg 1, 22 February–28 March 2009, Colón
(Panama) – Port of Spain (Trinidad and Tobago), METEOR-Berichte, 1–196,
2011.
Schweitzer, P. N. and Lohmann, G. P.: Ontogeny and habitat of modern
menardiiform planktonic foraminifera, J. Foramin. Res., 21,
332–346, 1991.
Shackleton, N. J., Wiseman, J. D. H., and Buckley, H. A.: Non-equilibrium
isotopic fractionation between seawater and planktonic foraminiferal tests,
Nature, 242, 177–179, https://doi.org/10.1038/242177a0, 1973.
Spero, H. J.: Ultrastructural examination of chamber morphogenesis and
biomineralization in the planktonic foraminifer Orbulina universa, Mar. Biol., 99, 9–20,
1988.
Spero, H. J.: Do planktic foraminifera accurately record shifts in the
carbon isotopic composition of seawater ∑CO2?, Mar. Micropaleontol., 19, 275–285, 1992.
Spero, H. J. and Lea, D. W.: Intraspecific stable isotope variability in
the planktic foraminifera Globigerinoides sacculifer: Results from laboratory experiments, Mar. Micropaleontol., 22, 221–234, 1993.
Spero, H. J. and Lea, D. W.: Experimental determination of stable isotope
variability in Globigerina bulloides: implications for paleoceanographic reconstructions, Mar. Micropaleontol., 28, 231–246, 1996.
Spero, H. J. and Parker, S. L.: Photosynthesis in the symbiotic planktonic
foraminifer Orbulina universa, and its potential contribution to oceanic primary
productivity, J. Foramin. Res., 15, 273–281, 1985.
Spero, H. J., Bijma, J., Lea, D. W., and Bemis, B. E.: Effect of seawater
carbonate concentration on foraminiferal carbon and oxygen isotopes, Nature,
390, 497–500, https://doi.org/10.1038/37333, 1997.
Spero, H. J., Mielke, K. M., Kalve, E. M., Lea, D. W., and Pak, D. K.:
Multispecies approach to reconstructing eastern equatorial Pacific
thermocline hydrography during the past 360 kyr, Paleoceanography, 18, 1022,
https://doi.org/10.1029/2002PA000814, 2003.
Spero, H. J., Eggins, S. M., Russell, A. D., Vetter, L., Kilburn, M. R., and
Hönisch, B.: Timing and mechanism for intratest Mg ∕ Ca
variability in a living planktic foraminifer, Earth Planet. Sc. Lett., 409, 32–42, 2015.
Spezzaferri, S., Kučera, M., Pearson, P. N., Wade, B. S., Rappo, S.,
Poole, C. R., Morard, R., and Stalder, C.: Fossil and Genetic Evidence for
the Polyphyletic Nature of the Planktonic Foraminifera “Globigerinoides”,
and Description of the New Genus Trilobatus, PLoS ONE, 10, e0128108, https://doi.org/10.1371/journal.pone.0128108, 2015.
Steinhardt, J., de Nooijer, L. L. J., Brummer, G.-J., and Reichart, G.-J.:
Profiling planktonic foraminiferal crust formation, Geochem. Geophys.
Geosyst., 16, 2409–2430, https://doi.org/10.1002/2015GC005752, 2015.
Steph, S., Regenberg, M., Tiedemann, R., Mulitza, S., and Nürnberg, D.:
Stable isotopes of planktonic foraminifera from tropical Atlantic/Caribbean
core-tops: Implications for reconstructing upper ocean stratification,
Mar. Micropaleontol., 71, 1–19, 2009.
Tedesco, K., Thunell, R., Astor, Y., Muller-Karger, F.: The oxygen isotope
composition of planktonic foraminifera from the Cariaco Basin, Venezuela:
Seasonal and interannual variations, Mar. Micropaleontol., 62, 180–193,
2007.
Van Geldern, R. and Barth, J.: Optimization of instrument setup and
post-run corrections for oxygen and hydrogen stable isotope measurements of
water by isotope ratio infrared spectroscopy (IRIS), Limnol. Oceanogr.-Methods, 10, 1024–1036, 2012.
Vergnaud-Grazzini, C.: Non-equilibrium isotopic compositions of shells of
planktonic foraminifera in the Mediterranean Sea, Palaeogeogr. Palaeocl., 20, 263–276, 1976.
Vidal, V. M. V., Vidal, F. V., Hernández, A. F., Meza, E., and Zambrano,
L.: Winter water mass distributions in the western Gulf of Mexico affected
by a colliding anticyclonic ring, J. Oceanogr., 50, 559–588,
1994.
Vukovich, F. M.: Climatology of Ocean Features in the Gulf of Mexico Using
Satellite Remote Sensing Data, J. Phys. Oceanogr., 37,
689–707, https://doi.org/10.1175/JPO2989.1, 2007.
Watanabe, T., Winter, A., and Oba, T.: Seasonal changes in sea surface
temperature and salinity during the Little Ice Age in the Caribbean Sea
deduced from Mg ∕ Ca and 18O ∕ 16O ratios in
corals, Mar. Geol., 173, 21–35, 2001.
Weiner, S. and Dove, P. M.: An overview of biomineralization processes and
the problem of the vital effect, Rev. Mineral. Geochem., 54, 1–29,
https://doi.org/10.2113/0540001, 2003.
Wilke, I., Bickert, T., and Peeters, F. J. C.: The influence of seawater
carbonate ion concentration [
Wüst, G.: Stratification and circulation in the Antillean-Caribbean
basins, Columbia University Press, Palisades, New York, 1964.
Zeebe, R. E.: An explanation of the effect of seawater carbonate
concentration on foraminiferal oxygen isotopes, Geochim. Cosmochim. Ac., 63, 2001–2007, 1999.
Zweng, M. M, Reagan, J. R., Antonov, J. I., Locarnini, R. A., Mishonov, A.
V., Boyer, T. P., Garcia, H. E., Baranova, O. K., Johnson, D. R., Seidov,
D., and Biddle, M. M.: World Ocean Atlas 2013, Volume 2: Salinity, in: NOAA
Atlas NESDIS 74, edited by: Levitus, S. and Mishonov, A., Silver Spring, Maryland, 2013.
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