Articles | Volume 17, issue 2
https://doi.org/10.5194/cp-17-703-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-703-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Mar 2021
Research article |
| 26 Mar 2021
Atmospheric carbon dioxide variations across the middle Miocene climate transition
MARUM – Zentrum für Marine Umweltwissenschaften, Universität Bremen, Leobener Straße 8, 28359 Bremen, Germany
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und
Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
Jelle Bijma
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und
Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
Torsten Bickert
MARUM – Zentrum für Marine Umweltwissenschaften, Universität Bremen, Leobener Straße 8, 28359 Bremen, Germany
Michael Schulz
MARUM – Zentrum für Marine Umweltwissenschaften, Universität Bremen, Leobener Straße 8, 28359 Bremen, Germany
Ann Holbourn
Institut für Geowissenschaften, Christian-Albrechts-Universität, 24118 Kiel, Germany
Michal Kučera
MARUM – Zentrum für Marine Umweltwissenschaften, Universität Bremen, Leobener Straße 8, 28359 Bremen, Germany
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Andreia Rebotim, Antje Helga Luise Voelker, Lukas Jonkers, Joanna J. Waniek, Michael Schulz, and Michal Kucera
J. Micropalaeontol., 38, 113–131, https://doi.org/10.5194/jm-38-113-2019, https://doi.org/10.5194/jm-38-113-2019, 2019
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To reconstruct subsurface water conditions using deep-dwelling planktonic foraminifera, we must fully understand how the oxygen isotope signal incorporates into their shell. We report δ18O in four species sampled in the eastern North Atlantic with plankton tows. We assess the size and crust effect on the isotopic δ18O and compared them with predictions from two equations. We reveal different patterns of calcite addition with depth, highlighting the need to perform species-specific calibrations.
Charlotte Breitkreuz, André Paul, and Michael Schulz
Clim. Past Discuss., https://doi.org/10.5194/cp-2019-52, https://doi.org/10.5194/cp-2019-52, 2019
Publication in CP not foreseen
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We combined a model simulation of the Last Glacial Maximum ocean with sea surface temperature and calcite oxygen isotope data through data assimilation. The reconstructed ocean state is very similar to the modern and it follows that the employed proxy data do not require an ocean state very different from today's. Sensitivity experiments reveal that data from the deep North Atlantic but also from the global deep Southern Ocean are most important to constrain the Atlantic overturning circulation.
Lukas Jonkers and Michal Kučera
Clim. Past, 15, 881–891, https://doi.org/10.5194/cp-15-881-2019, https://doi.org/10.5194/cp-15-881-2019, 2019
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Fossil plankton assemblages have been widely used to reconstruct SST. In such approaches, full taxonomic resolution is often used. We assess whether this is required for reliable reconstructions as some species may not respond to SST. We find that only a few species are needed for low reconstruction errors but that species selection has a pronounced effect on reconstructions. We suggest that the sensitivity of a reconstruction to species pruning can be used as a measure of its robustness.
Eveline M. Mezger, Lennart J. de Nooijer, Jacqueline Bertlich, Jelle Bijma, Dirk Nürnberg, and Gert-Jan Reichart
Biogeosciences, 16, 1147–1165, https://doi.org/10.5194/bg-16-1147-2019, https://doi.org/10.5194/bg-16-1147-2019, 2019
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Seawater salinity is an important factor when trying to reconstruct past ocean conditions. Foraminifera, small organisms living in the sea, produce shells that incorporate more Na at higher salinities. The accuracy of reconstructions depends on the fundamental understanding involved in the incorporation and preservation of the original Na of the shell. In this study, we unravel the Na composition of different components of the shell and describe the relative contribution of these components.
Charlotte Breitkreuz, André Paul, Stefan Mulitza, Javier García-Pintado, and Michael Schulz
Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2019-32, https://doi.org/10.5194/gmd-2019-32, 2019
Publication in GMD not foreseen
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We present a technique for ocean state estimation based on the combination of a simple data assimilation method with a state reduction approach. The technique proves to be very efficient and successful in reducing the model-data misfit and reconstructing a target ocean circulation from synthetic observations. In an application to Last Glacial Maximum proxy data the model-data misfit is greatly reduced but some misfit remains. Two different ocean states are found with similar model-data misfit.
Nadia Al-Sabouni, Isabel S. Fenton, Richard J. Telford, and Michal Kučera
J. Micropalaeontol., 37, 519–534, https://doi.org/10.5194/jm-37-519-2018, https://doi.org/10.5194/jm-37-519-2018, 2018
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Jacqueline Bertlich, Dirk Nürnberg, Ed C. Hathorne, Lennart J. de Nooijer, Eveline M. Mezger, Markus Kienast, Steffanie Nordhausen, Gert-Jan Reichart, Joachim Schönfeld, and Jelle Bijma
Biogeosciences, 15, 5991–6018, https://doi.org/10.5194/bg-15-5991-2018, https://doi.org/10.5194/bg-15-5991-2018, 2018
Andrea Klus, Matthias Prange, Vidya Varma, Louis Bruno Tremblay, and Michael Schulz
Clim. Past, 14, 1165–1178, https://doi.org/10.5194/cp-14-1165-2018, https://doi.org/10.5194/cp-14-1165-2018, 2018
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Numerous proxy records from the northern North Atlantic suggest substantial climate variability including the occurrence of multi-decadal-to-centennial cold events during the Holocene. We analyzed two abrupt cold events in a Holocene simulation using a comprehensive climate model. It is shown that the events were ultimately triggered by prolonged phases of positive North Atlantic Oscillation causing changes in ocean circulation followed by severe cooling, freshening, and expansion of sea ice.
Kerstin Kretschmer, Lukas Jonkers, Michal Kucera, and Michael Schulz
Biogeosciences, 15, 4405–4429, https://doi.org/10.5194/bg-15-4405-2018, https://doi.org/10.5194/bg-15-4405-2018, 2018
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The fossil shells of planktonic foraminifera are widely used to reconstruct past climate conditions. To do so, information about their seasonal and vertical habitat is needed. Here we present an updated version of a planktonic foraminifera model to better understand species-specific habitat dynamics under climate change. This model produces spatially and temporally coherent distribution patterns, which agree well with available observations, and can thus aid the interpretation of proxy records.
Amanda Frigola, Matthias Prange, and Michael Schulz
Geosci. Model Dev., 11, 1607–1626, https://doi.org/10.5194/gmd-11-1607-2018, https://doi.org/10.5194/gmd-11-1607-2018, 2018
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The application of climate models to study the Middle Miocene Climate Transition, characterized by major Antarctic ice-sheet expansion and global cooling at the interval 15–13 million years ago, is currently hampered by the lack of boundary conditions. To fill this gap, we compiled two internally consistent sets of boundary conditions, including global topography, bathymetry, vegetation and ice volume, for the periods before and after the transition.
Rike Völpel, André Paul, Annegret Krandick, Stefan Mulitza, and Michael Schulz
Geosci. Model Dev., 10, 3125–3144, https://doi.org/10.5194/gmd-10-3125-2017, https://doi.org/10.5194/gmd-10-3125-2017, 2017
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This study presents the implementation of stable water isotopes in the MITgcm and describes the results of an equilibrium simulation under pre-industrial conditions. The model compares well to observational data and measurements of plankton tow records and thus opens wide prospects for long-term simulations in a paleoclimatic context.
Lennart J. de Nooijer, Anieke Brombacher, Antje Mewes, Gerald Langer, Gernot Nehrke, Jelle Bijma, and Gert-Jan Reichart
Biogeosciences, 14, 3387–3400, https://doi.org/10.5194/bg-14-3387-2017, https://doi.org/10.5194/bg-14-3387-2017, 2017
Raphaël Morard, Franck Lejzerowicz, Kate F. Darling, Béatrice Lecroq-Bennet, Mikkel Winther Pedersen, Ludovic Orlando, Jan Pawlowski, Stefan Mulitza, Colomban de Vargas, and Michal Kucera
Biogeosciences, 14, 2741–2754, https://doi.org/10.5194/bg-14-2741-2017, https://doi.org/10.5194/bg-14-2741-2017, 2017
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The exploitation of deep-sea sedimentary archive relies on the recovery of mineralized skeletons of pelagic organisms. Planktonic groups leaving preserved remains represent only a fraction of the total marine diversity. Environmental DNA left by non-fossil organisms is a promising source of information for paleo-reconstructions. Here we show how planktonic-derived environmental DNA preserves ecological structure of planktonic communities. We use planktonic foraminifera as a case study.
Lukas Jonkers and Michal Kučera
Clim. Past, 13, 573–586, https://doi.org/10.5194/cp-13-573-2017, https://doi.org/10.5194/cp-13-573-2017, 2017
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Planktonic foraminifera – the most important proxy carriers in palaeoceanography – adjust their seasonal and vertical habitat. They are thought to do so in a way that minimises the change in their environment, implying that proxy records based on these organisms may not capture the full amplitude of past climate change. Here we demonstrate that they indeed track a particular thermal habitat and suggest that this could lead to a 40 % underestimation of reconstructed temperature change.
Philipp M. Munz, Stephan Steinke, Anna Böll, Andreas Lückge, Jeroen Groeneveld, Michal Kucera, and Hartmut Schulz
Clim. Past, 13, 491–509, https://doi.org/10.5194/cp-13-491-2017, https://doi.org/10.5194/cp-13-491-2017, 2017
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We present the results of several independent proxies of summer SST and upwelling SST from the Oman margin indicative of monsoon strength during the early Holocene. In combination with indices of carbonate preservation and bottom water redox conditions, we demonstrate that a persistent solar influence was modulating summer monsoon intensity. Furthermore, bottom water conditions are linked to atmospheric forcing, rather than changes of intermediate water masses.
Andreia Rebotim, Antje H. L. Voelker, Lukas Jonkers, Joanna J. Waniek, Helge Meggers, Ralf Schiebel, Igaratza Fraile, Michael Schulz, and Michal Kucera
Biogeosciences, 14, 827–859, https://doi.org/10.5194/bg-14-827-2017, https://doi.org/10.5194/bg-14-827-2017, 2017
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Planktonic foraminifera species depth habitat remains poorly constrained and the existing conceptual models are not sufficiently tested by observational data. Here we present a synthesis of living planktonic foraminifera abundance data in the subtropical eastern North Atlantic from vertical plankton tows. We also test potential environmental factors influencing the species depth habitat and investigate yearly or lunar migration cycles. These findings may impact paleoceanographic studies.
Ella L. Howes, Karina Kaczmarek, Markus Raitzsch, Antje Mewes, Nienke Bijma, Ingo Horn, Sambuddha Misra, Jean-Pierre Gattuso, and Jelle Bijma
Biogeosciences, 14, 415–430, https://doi.org/10.5194/bg-14-415-2017, https://doi.org/10.5194/bg-14-415-2017, 2017
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To calculate the seawater carbonate system, proxies for 2 out of 7 parameters are required. The boron isotopic composition of foraminifera shells can be used as a proxy for pH and it has been suggested that B / Ca ratios may act as a proxy for carbonate ion concentration. However, differentiating between the effects of pH and [CO32−] is problematic, as they co-vary in natural systems. To deconvolve the effects, we conducted culture experiments with the planktonic foraminifer Orbulina universa.
Vidya Varma, Matthias Prange, and Michael Schulz
Geosci. Model Dev., 9, 3859–3873, https://doi.org/10.5194/gmd-9-3859-2016, https://doi.org/10.5194/gmd-9-3859-2016, 2016
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We compare the results from simulations of the present and the last interglacial, with and without acceleration of the orbital forcing, using a comprehensive coupled climate model. In low latitudes, the simulation of long-term variations in interglacial surface climate is not significantly affected by the use of the acceleration technique and hence model–data comparison of surface variables is therefore not hampered but major repercussions of the orbital forcing are obvious below thermocline.
Rima Rachmayani, Matthias Prange, and Michael Schulz
Clim. Past, 12, 677–695, https://doi.org/10.5194/cp-12-677-2016, https://doi.org/10.5194/cp-12-677-2016, 2016
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A set of 13 interglacial time slice experiments was carried out using a CCSM3-DGVM to study global climate variability between and within the Quaternary interglaciations of MIS 1, 5, 11, 13, and 15. Seasonal surface temperature anomalies can be explained by local insolation anomalies induced by the astronomical forcing in most regions and by GHG forcing at high latitudes and early Bruhnes interglacials. However, climate feedbacks may modify the surface temperature response in specific regions.
G. Dishon, J. Fisch, I. Horn, K. Kaczmarek, J. Bijma, D. F. Gruber, O. Nir, Y. Popovich, and D. Tchernov
Biogeosciences, 12, 5677–5687, https://doi.org/10.5194/bg-12-5677-2015, https://doi.org/10.5194/bg-12-5677-2015, 2015
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This paper offers a new methodology to study paleo-coral bleaching events using high-resolution femtosecond Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry. Coral bleaching records only go back several decades, but this new proxy allows the study of bleaching events that occurred tens of thousands of years ago. Unlike other methods, the high-resolution of the method can detect bleaching events that occur over very short time periods, just a few weeks.
L. Jonkers and M. Kučera
Biogeosciences, 12, 2207–2226, https://doi.org/10.5194/bg-12-2207-2015, https://doi.org/10.5194/bg-12-2207-2015, 2015
A. Mewes, G. Langer, S. Thoms, G. Nehrke, G.-J. Reichart, L. J. de Nooijer, and J. Bijma
Biogeosciences, 12, 2153–2162, https://doi.org/10.5194/bg-12-2153-2015, https://doi.org/10.5194/bg-12-2153-2015, 2015
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A culture study with the benthic foraminifer Amphistegina lessonii was conducted at varying seawater [Ca2+] and constant [Mg2+]. Results showed optimum growth rates and test thickness at ambient seawater Mg/Ca and a calcite Mg/Ca which is controlled by the relative seawater ratio. Results support the conceptual biomineralization model by Nehrke et al. (2013); however, our refined flux-based model suggests transmembrane transport fractionation that is slightly weaker than expected.
K. Kaczmarek, G. Langer, G. Nehrke, I. Horn, S. Misra, M. Janse, and J. Bijma
Biogeosciences, 12, 1753–1763, https://doi.org/10.5194/bg-12-1753-2015, https://doi.org/10.5194/bg-12-1753-2015, 2015
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Culture experiments based on a decoupled pH and CO32- chemistry indicate that the δ11B of the test of A. lessonii is related to pH whereas the B/Ca of the foraminiferal shells show a positive correlation with B(OH)4-/HCO3-. The latter observation suggests a competition between B(OH)4- and HCO3- of the culture media for B uptake into the test.
R. Rachmayani, M. Prange, and M. Schulz
Clim. Past, 11, 175–185, https://doi.org/10.5194/cp-11-175-2015, https://doi.org/10.5194/cp-11-175-2015, 2015
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The role of vegetation-precipitation feedbacks in modifying the North African rainfall response to enhanced early to mid-Holocene summer insolation is analysed using the climate-vegetation model CCSM3-DGVM. Dynamic vegetation amplifies the positive early to mid-Holocene summer precipitation anomaly by ca. 20% in the Sahara-Sahel region. The primary vegetation feedback operates through surface latent heat flux anomalies by canopy evapotranspiration and their effect on the African easterly jet.
G. Langer, G. Nehrke, C. Baggini, R. Rodolfo-Metalpa, J. M. Hall-Spencer, and J. Bijma
Biogeosciences, 11, 7363–7368, https://doi.org/10.5194/bg-11-7363-2014, https://doi.org/10.5194/bg-11-7363-2014, 2014
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Specimens of the patellogastropod limpet Patella caerulea were collected within and outside a CO2 vent site at Ischia, Italy. The distribution of different crystal structures across shell sections was analysed. Patella caerulea counteracts shell dissolution in corrosive waters by enhanced production of aragonitic parts of the shell. We conclude that it is not possible to predict the dissolution behaviour of a composite biomineral on the basis of the properties of its constituent mineral.
I. Hessler, S. P. Harrison, M. Kucera, C. Waelbroeck, M.-T. Chen, C. Anderson, A. de Vernal, B. Fréchette, A. Cloke-Hayes, G. Leduc, and L. Londeix
Clim. Past, 10, 2237–2252, https://doi.org/10.5194/cp-10-2237-2014, https://doi.org/10.5194/cp-10-2237-2014, 2014
A. J. Enge, U. Witte, M. Kucera, and P. Heinz
Biogeosciences, 11, 2017–2026, https://doi.org/10.5194/bg-11-2017-2014, https://doi.org/10.5194/bg-11-2017-2014, 2014
G. Nehrke, N. Keul, G. Langer, L. J. de Nooijer, J. Bijma, and A. Meibom
Biogeosciences, 10, 6759–6767, https://doi.org/10.5194/bg-10-6759-2013, https://doi.org/10.5194/bg-10-6759-2013, 2013
M. F. G. Weinkauf, T. Moller, M. C. Koch, and M. Kučera
Biogeosciences, 10, 6639–6655, https://doi.org/10.5194/bg-10-6639-2013, https://doi.org/10.5194/bg-10-6639-2013, 2013
Y. Milker, R. Rachmayani, M. F. G. Weinkauf, M. Prange, M. Raitzsch, M. Schulz, and M. Kučera
Clim. Past, 9, 2231–2252, https://doi.org/10.5194/cp-9-2231-2013, https://doi.org/10.5194/cp-9-2231-2013, 2013
N. Keul, G. Langer, L. J. de Nooijer, and J. Bijma
Biogeosciences, 10, 6185–6198, https://doi.org/10.5194/bg-10-6185-2013, https://doi.org/10.5194/bg-10-6185-2013, 2013
R. J. Telford, C. Li, and M. Kucera
Clim. Past, 9, 859–870, https://doi.org/10.5194/cp-9-859-2013, https://doi.org/10.5194/cp-9-859-2013, 2013
P. Bakker, E. J. Stone, S. Charbit, M. Gröger, U. Krebs-Kanzow, S. P. Ritz, V. Varma, V. Khon, D. J. Lunt, U. Mikolajewicz, M. Prange, H. Renssen, B. Schneider, and M. Schulz
Clim. Past, 9, 605–619, https://doi.org/10.5194/cp-9-605-2013, https://doi.org/10.5194/cp-9-605-2013, 2013
Related subject area
Subject: Proxy Use-Development-Validation | Archive: Marine Archives | Timescale: Cenozoic
A 15-million-year surface- and subsurface-integrated TEX86 temperature record from the eastern equatorial Atlantic
Sclerochronological evidence of pronounced seasonality from the late Pliocene of the southern North Sea basin and its implications
Pliocene evolution of the tropical Atlantic thermocline depth
Maastrichtian–Rupelian paleoclimates in the southwest Pacific – a critical re-evaluation of biomarker paleothermometry and dinoflagellate cyst paleoecology at Ocean Drilling Program Site 1172
Southern Ocean bottom-water cooling and ice sheet expansion during the middle Miocene climate transition
Rapid and sustained environmental responses to global warming: the Paleocene–Eocene Thermal Maximum in the eastern North Sea
OPTiMAL: a new machine learning approach for GDGT-based palaeothermometry
Technical note: A new automated radiolarian image acquisition, stacking, processing, segmentation and identification workflow
Late Paleocene–early Eocene Arctic Ocean sea surface temperatures: reassessing biomarker paleothermometry at Lomonosov Ridge
Surface-circulation change in the southwest Pacific Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry
A new age model for the Pliocene of the southern North Sea basin: a multi-proxy climate reconstruction
Joint inversion of proxy system models to reconstruct paleoenvironmental time series from heterogeneous data
Mercury anomalies across the Palaeocene–Eocene Thermal Maximum
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982
Highly variable Pliocene sea surface conditions in the Norwegian Sea
The PRISM4 (mid-Piacenzian) paleoenvironmental reconstruction
Revisiting carbonate chemistry controls on planktic foraminifera Mg / Ca: implications for sea surface temperature and hydrology shifts over the Paleocene–Eocene Thermal Maximum and Eocene–Oligocene transition
The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean
The bivalve Glycymeris planicostalis as a high-resolution paleoclimate archive for the Rupelian (Early Oligocene) of central Europe
Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology
Exploring the controls on element ratios in middle Eocene samples of the benthic foraminifera Oridorsalis umbonatus
Application of Fourier Transform Infrared Spectroscopy (FTIR) for assessing biogenic silica sample purity in geochemical analyses and palaeoenvironmental research
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
Clim. Past, 18, 1947–1962, https://doi.org/10.5194/cp-18-1947-2022, https://doi.org/10.5194/cp-18-1947-2022, 2022
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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.
Andrew L. A. Johnson, Annemarie M. Valentine, Bernd R. Schöne, Melanie J. Leng, and Stijn Goolaerts
Clim. Past, 18, 1203–1229, https://doi.org/10.5194/cp-18-1203-2022, https://doi.org/10.5194/cp-18-1203-2022, 2022
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Determining seasonal temperatures demands proxies that record the highest and lowest temperatures over the annual cycle. Many record neither, but oxygen isotope profiles from shells in principle record both. Oxygen isotope data from late Pliocene bivalve molluscs of the southern North Sea basin show that the seasonal temperature range was at times much higher than previously estimated and higher than now. This suggests reduced oceanic heat supply, in contrast to some previous interpretations.
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.
Peter K. Bijl, Joost Frieling, Margot J. Cramwinckel, Christine Boschman, Appy Sluijs, and Francien Peterse
Clim. Past, 17, 2393–2425, https://doi.org/10.5194/cp-17-2393-2021, https://doi.org/10.5194/cp-17-2393-2021, 2021
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Here, we use the latest insights for GDGT and dinocyst-based paleotemperature and paleoenvironmental reconstructions in late Cretaceous–early Oligocene sediments from ODP Site 1172 (East Tasman Plateau, Australia). We reconstruct strong river runoff during the Paleocene–early Eocene, a progressive decline thereafter with increased wet/dry seasonality in the northward-drifting hinterland. Our critical review leaves the anomalous warmth of the Eocene SW Pacific Ocean unexplained.
Thomas J. Leutert, Sevasti Modestou, Stefano M. Bernasconi, and A. Nele Meckler
Clim. Past, 17, 2255–2271, https://doi.org/10.5194/cp-17-2255-2021, https://doi.org/10.5194/cp-17-2255-2021, 2021
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The Miocene climatic optimum associated with high atmospheric CO2 levels (~17–14 Ma) was followed by a period of dramatic climate change. We present a clumped isotope-based bottom-water temperature record from the Southern Ocean covering this key climate transition. Our record reveals warm conditions and a substantial cooling preceding the main ice volume increase, possibly caused by thresholds involved in ice growth and/or regional effects at our study site.
Ella W. Stokke, Morgan T. Jones, Lars Riber, Haflidi Haflidason, Ivar Midtkandal, Bo Pagh Schultz, and Henrik H. Svensen
Clim. Past, 17, 1989–2013, https://doi.org/10.5194/cp-17-1989-2021, https://doi.org/10.5194/cp-17-1989-2021, 2021
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In this paper, we present new sedimentological, geochemical, and mineralogical data exploring the environmental response to climatic and volcanic impact during the Paleocene–Eocene Thermal Maximum (~55.9 Ma; PETM). Our data suggest a rise in continental weathering and a shift to anoxic–sulfidic conditions. This indicates a rapid environmental response to changes in the carbon cycle and temperatures and highlights the important role of shelf areas as carbon sinks driving the PETM recovery.
Tom Dunkley Jones, Yvette L. Eley, William Thomson, Sarah E. Greene, Ilya Mandel, Kirsty Edgar, and James A. Bendle
Clim. Past, 16, 2599–2617, https://doi.org/10.5194/cp-16-2599-2020, https://doi.org/10.5194/cp-16-2599-2020, 2020
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We explore the utiliity of the composition of fossil lipid biomarkers, which are commonly preserved in ancient marine sediments, in providing estimates of past ocean temperatures. The group of lipids concerned show compositional changes across the modern oceans that are correlated, to some extent, with local surface ocean temperatures. Here we present new machine learning approaches to improve our understanding of this temperature sensitivity and its application to reconstructing past climates.
Martin Tetard, Ross Marchant, Giuseppe Cortese, Yves Gally, Thibault de Garidel-Thoron, and Luc Beaufort
Clim. Past, 16, 2415–2429, https://doi.org/10.5194/cp-16-2415-2020, https://doi.org/10.5194/cp-16-2415-2020, 2020
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Radiolarians are marine micro-organisms that produce a siliceous shell that is preserved in the fossil record and can be used to reconstruct past climate variability. However, their study is only possible after a time-consuming manual selection of their shells from the sediment followed by their individual identification. Thus, we develop a new fully automated workflow consisting of microscopic radiolarian image acquisition, image processing and identification using artificial intelligence.
Appy Sluijs, Joost Frieling, Gordon N. Inglis, Klaas G. J. Nierop, Francien Peterse, Francesca Sangiorgi, and Stefan Schouten
Clim. Past, 16, 2381–2400, https://doi.org/10.5194/cp-16-2381-2020, https://doi.org/10.5194/cp-16-2381-2020, 2020
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We revisit 15-year-old reconstructions of sea surface temperatures in the Arctic Ocean for the late Paleocene and early Eocene epochs (∼ 57–53 million years ago) based on the distribution of fossil membrane lipids of archaea preserved in Arctic Ocean sediments. We find that improvements in the methods over the past 15 years do not lead to different results. However, data quality is now higher and potential biases better characterized. Results confirm remarkable Arctic warmth during this time.
Margot J. Cramwinckel, Lineke Woelders, Emiel P. Huurdeman, Francien Peterse, Stephen J. Gallagher, Jörg Pross, Catherine E. Burgess, Gert-Jan Reichart, Appy Sluijs, and Peter K. Bijl
Clim. Past, 16, 1667–1689, https://doi.org/10.5194/cp-16-1667-2020, https://doi.org/10.5194/cp-16-1667-2020, 2020
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Phases of past transient warming can be used as a test bed to study the environmental response to climate change independent of tectonic change. Using fossil plankton and organic molecules, here we reconstruct surface ocean temperature and circulation in and around the Tasman Gateway during a warming phase 40 million years ago termed the Middle Eocene Climatic Optimum. We find that plankton assemblages track ocean circulation patterns, with superimposed variability being related to temperature.
Emily Dearing Crampton-Flood, Lars J. Noorbergen, Damian Smits, R. Christine Boschman, Timme H. Donders, Dirk K. Munsterman, Johan ten Veen, Francien Peterse, Lucas Lourens, and Jaap S. Sinninghe Damsté
Clim. Past, 16, 523–541, https://doi.org/10.5194/cp-16-523-2020, https://doi.org/10.5194/cp-16-523-2020, 2020
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The mid-Pliocene warm period (mPWP; 3.3–3.0 million years ago) is thought to be the last geological interval with similar atmospheric carbon dioxide concentrations as the present day. Further, the mPWP was 2–3 °C warmer than present, making it a good analogue for estimating the effects of future climate change. Here, we construct a new precise age model for the North Sea during the mPWP, and provide a detailed reconstruction of terrestrial and marine climate using a multi-proxy approach.
Gabriel J. Bowen, Brenden Fischer-Femal, Gert-Jan Reichart, Appy Sluijs, and Caroline H. Lear
Clim. Past, 16, 65–78, https://doi.org/10.5194/cp-16-65-2020, https://doi.org/10.5194/cp-16-65-2020, 2020
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Past climate conditions are reconstructed using indirect and incomplete geological, biological, and geochemical proxy data. We propose that such reconstructions are best obtained by statistical inversion of hierarchical models that represent how multi–proxy observations and calibration data are produced by variation of environmental conditions in time and/or space. These methods extract new information from traditional proxies and provide robust, comprehensive estimates of uncertainty.
Morgan T. Jones, Lawrence M. E. Percival, Ella W. Stokke, Joost Frieling, Tamsin A. Mather, Lars Riber, Brian A. Schubert, Bo Schultz, Christian Tegner, Sverre Planke, and Henrik H. Svensen
Clim. Past, 15, 217–236, https://doi.org/10.5194/cp-15-217-2019, https://doi.org/10.5194/cp-15-217-2019, 2019
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Mercury anomalies in sedimentary rocks are used to assess whether there were periods of elevated volcanism in the geological record. We focus on five sites that cover the Palaeocene–Eocene Thermal Maximum, an extreme global warming event that occurred 55.8 million years ago. We find that sites close to the eruptions from the North Atlantic Igneous Province display significant mercury anomalies across this time interval, suggesting that magmatism played a role in the global warming event.
Anna Joy Drury, Thomas Westerhold, David Hodell, and Ursula Röhl
Clim. Past, 14, 321–338, https://doi.org/10.5194/cp-14-321-2018, https://doi.org/10.5194/cp-14-321-2018, 2018
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North Atlantic Site 982 is key to our understanding of climate evolution over the past 12 million years. However, the stratigraphy and age model are unverified. We verify the composite splice using XRF core scanning data and establish a revised benthic foraminiferal stable isotope astrochronology from 8.0–4.5 million years ago. Our new stratigraphy accurately correlates the Atlantic and the Mediterranean and suggests a connection between late Miocene cooling and dynamic ice sheet expansion.
Paul E. Bachem, Bjørg Risebrobakken, Stijn De Schepper, and Erin L. McClymont
Clim. Past, 13, 1153–1168, https://doi.org/10.5194/cp-13-1153-2017, https://doi.org/10.5194/cp-13-1153-2017, 2017
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We present a high-resolution multi-proxy study of the Norwegian Sea, covering the 5.33 to 3.14 Ma time window within the Pliocene. We show that large-scale climate transitions took place during this warmer than modern time, most likely in response to ocean gateway transformations. Strong warming at 4.0 Ma in the Norwegian Sea, when regions closer to Greenland cooled, indicate that increased northward ocean heat transport may be compatible with expanding glaciation and Arctic sea ice growth.
Harry Dowsett, Aisling Dolan, David Rowley, Robert Moucha, Alessandro M. Forte, Jerry X. Mitrovica, Matthew Pound, Ulrich Salzmann, Marci Robinson, Mark Chandler, Kevin Foley, and Alan Haywood
Clim. Past, 12, 1519–1538, https://doi.org/10.5194/cp-12-1519-2016, https://doi.org/10.5194/cp-12-1519-2016, 2016
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Past intervals in Earth history provide unique windows into conditions much different than those observed today. We investigated the paleoenvironments of a past warm interval (~ 3 million years ago). Our reconstruction includes data sets for surface temperature, vegetation, soils, lakes, ice sheets, topography, and bathymetry. These data are being used along with global climate models to expand our understanding of the climate system and to help us prepare for future changes.
David Evans, Bridget S. Wade, Michael Henehan, Jonathan Erez, and Wolfgang Müller
Clim. Past, 12, 819–835, https://doi.org/10.5194/cp-12-819-2016, https://doi.org/10.5194/cp-12-819-2016, 2016
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We show that seawater pH exerts a substantial control on planktic foraminifera Mg / Ca, a widely applied palaeothermometer. As a result, temperature reconstructions based on this proxy are likely inaccurate over climatic events associated with a significant change in pH. We examine the implications of our findings for hydrological and temperature shifts over the Paleocene-Eocene Thermal Maximum and for the degree of surface ocean precursor cooling before the Eocene-Oligocene transition.
C. J. Hollis, B. R. Hines, K. Littler, V. Villasante-Marcos, D. K. Kulhanek, C. P. Strong, J. C. Zachos, S. M. Eggins, L. Northcote, and A. Phillips
Clim. Past, 11, 1009–1025, https://doi.org/10.5194/cp-11-1009-2015, https://doi.org/10.5194/cp-11-1009-2015, 2015
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Re-examination of a Deep Sea Drilling Project sediment core (DSDP Site 277) from the western Campbell Plateau has identified the initial phase of the Paleocene-Eocene Thermal Maximum (PETM) within nannofossil chalk, the first record of the PETM in an oceanic setting in the southern Pacific Ocean (paleolatitude of ~65°S). Geochemical proxies indicate that intermediate and surface waters warmed by ~6° at the onset of the PETM prior to the full development of the negative δ13C excursion.
E. O. Walliser, B. R. Schöne, T. Tütken, J. Zirkel, K. I. Grimm, and J. Pross
Clim. Past, 11, 653–668, https://doi.org/10.5194/cp-11-653-2015, https://doi.org/10.5194/cp-11-653-2015, 2015
A. M. Snelling, G. E. A. Swann, J. Pike, and M. J. Leng
Clim. Past, 10, 1837–1842, https://doi.org/10.5194/cp-10-1837-2014, https://doi.org/10.5194/cp-10-1837-2014, 2014
K. T. Lawrence, I. Bailey, and M. E. Raymo
Clim. Past, 9, 2391–2397, https://doi.org/10.5194/cp-9-2391-2013, https://doi.org/10.5194/cp-9-2391-2013, 2013
C. F. Dawber and A. K. Tripati
Clim. Past, 8, 1957–1971, https://doi.org/10.5194/cp-8-1957-2012, https://doi.org/10.5194/cp-8-1957-2012, 2012
G. E. A. Swann and S. V. Patwardhan
Clim. Past, 7, 65–74, https://doi.org/10.5194/cp-7-65-2011, https://doi.org/10.5194/cp-7-65-2011, 2011
Cited articles
Abels, H. A., Hilgen, F. J., Krijgsman, W., Kruk, R. W., Raffi, I., Turco,
E., and Zachariasse, W. J.: Long-period orbital control on middle Miocene
global cooling: Integrated stratigraphy and astronomical tuning of the Blue
Clay Formation on Malta, Paleoceanography, 20, PA4012,
https://doi.org/10.1029/2004PA001129, 2005.
Allen, K. A., Hönisch, B., Eggins, S. M., and Rosenthal, Y.:
Environmental controls on B/Ca in calcite tests of the tropical planktic
foraminifer species Globigerinoides ruber and Globigerinoides sacculifer, Earth Planet. Sci. Lett., 35/352,
270–280, https://doi.org/10.1016/j.epsl.2012.07.004, 2012.
Auer, G., Piller, W. E., Reuter, M., and Harzhauser, M.: Correlating carbon
and oxygen isotope events in early to middle Miocene shallow marine
carbonates in the Mediterranean region using orbitally tuned
chemostratigraphy and lithostratigraphy, Paleoceanography, 30, 332–352,
https://doi.org/10.1002/2014PA002716, 2015.
Aziz, H. A., Sanz-Rubio, E., Calvo, J. P., Hilgen, F. J., and Krijgsman, W.:
Palaeoenvironmental reconstruction of a middle Miocene alluvial fan to
cyclic shallow lacustrine depositional system in the Calatayud Basin (NE
Spain), Sedimentology, 50, 211–236,
https://doi.org/10.1046/j.1365-3091.2003.00544.x, 2003.
Badger, M. P. S., Lear, C. H., Pancost, R. D., Foster, G. L., Bailey, T. R.,
Leng, M. J., and Abels, H. A.: CO2 drawdown following the middle Miocene
expansion of the Antarctic Ice Sheet, Paleoceanography, 28, 42–53,
https://doi.org/10.1002/palo.20015, 2013.
Badger, M. P. S., Chalk, T. B., Foster, G. L., Bown, P. R., Gibbs, S. J., Sexton, P. F., Schmidt, D. N., Pälike, H., Mackensen, A., and Pancost, R. D.: Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels, Clim. Past, 15, 539–554, https://doi.org/10.5194/cp-15-539-2019, 2019.
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.
Betzler, C., Eberli, G. P., Lüdmann, T., Reolid, J., Kroon, D., Reijmer,
J. J. G., Swart, P. K., Wright, J., Young, J. R., Alvarez-Zarikian, C.,
Alonso-García, M., Bialik, O. M., Blättler, C. L., Guo, J. A.,
Haffen, S., Horozal, S., Inoue, M., Jovane, L., Lanci, L., Laya, J. C., Hui
Mee, A. L., Nakakuni, M., Nath, B. N., Niino, K., Petruny, L. M., Pratiwi,
S. D., Slagle, A. L., Sloss, C. R., Su, X., and Yao, Z.: Refinement of
Miocene sea level and monsoon events from the sedimentary archive of the
Maldives (Indian Ocean), Prog. Earth Planet. Sci., 5, 5,
https://doi.org/10.1186/s40645-018-0165-x, 2018.
Boudreau, B. P. and Luo, Y.: Retrodiction of secular variations in deep-sea
CaCO3 burial during the Cenozoic, Earth Planet. Sci. Lett., 474, 1–12,
https://doi.org/10.1016/j.epsl.2017.06.005, 2017.
Boudreau, B. P., Middelburg, J. J., Sluijs, A., and van der Ploeg, R.:
Secular variations in the carbonate chemistry of the oceans over the
Cenozoic, Earth Planet. Sci. Lett., 512, 194–206,
https://doi.org/10.1016/j.epsl.2019.02.004, 2019.
Brennan, S. T., Lowenstein, T. K., and Cendón, D. I.: The major-ion
composition of Cenozoic seawater: The past 36 million years from fluid
inclusions in marine halite, Am. J. Sci., 313, 713–775,
https://doi.org/10.2475/08.2013.01, 2013.
Caves, J. K., Jost, A. B., Lau, K. V., and Maher, K.: Cenozoic carbon cycle
imbalances and a variable weathering feedback, Earth Planet. Sci. Lett.,
450, 152–163, https://doi.org/10.1016/j.epsl.2016.06.035, 2016.
Clift, P. D. and Plumb, R. A.: The Asian Monsoon: Causes, History and
Effects, Cambridge University Press, Cambridge, UK, 2008.
Coxall, H. K., Wilson, P. A., Pälike, H., Lear, C. H., and Backman, J.:
Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation
in the Pacific Ocean, Nature, 433, 53–57, https://doi.org/10.1038/nature03135,
2005.
Diekmann, B., Falker, M., and Kuhn, G.: Environmental history of the
south-eastern South Atlantic since the Middle Miocene: evidence from the
sedimentological records of ODP Sites 1088 and 1092, Sedimentology, 50,
511–529, https://doi.org/10.1046/j.1365-3091.2003.00562.x, 2003.
Dyez, K. A., Hönisch, B., and Schmidt, G. A.: Early Pleistocene
Obliquity-Scale pCO2 Variability at 1.5 Million Years Ago, Paleocean.
Paleoclimat., 33, 1270–1291, https://doi.org/10.1029/2018PA003349,
2018.
Evans, D. and Müller, W.: Deep time foraminifera Mg/Ca paleothermometry:
Nonlinear correction for secular change in seawater Mg/Ca, Paleoceanography,
27, PA4205, https://doi.org/10.1029/2012PA002315, 2012.
Flower, B. P. and Kennett, J. P.: Middle Miocene ocean-climate transition:
High-resolution oxygen and carbon isotopic records from Deep Sea Drilling
Project Site 588A, southwest Pacific, Paleoceanography, 8, 811–843,
https://doi.org/10.1029/93PA02196, 1993.
Flower, B. P. and Kennett, J. P.: The middle Miocene climatic transition:
East Antarctic ice sheet development, deep ocean circulation and global
carbon cycling, Paleogeogr. Paleoclimatol., 108, 537–555,
https://doi.org/10.1016/0031-0182(94)90251-8, 1994.
Foster, G. L., Lear, C. H., and Rae, J. W. B.: The evolution of pCO2, ice
volume and climate during the middle Miocene, Earth Planet. Sci. Lett.,
344, 243–254, https://doi.org/10.1016/j.epsl.2012.06.007, 2012.
François, R., Altabet, M. A., Yu, E.-F., Sigman, D. M., Bacon, M. P.,
Frank, M., Bohrmann, G., Bareille, G., and Labeyrie, L. D.: Contribution of
Southern Ocean surface-water stratification to low atmospheric CO2
concentrations during the last glacial period, Nature, 389, 929–935,
https://doi.org/10.1038/40073, 1997.
Gaillardet, J., Lemarchand, D., Göpel, C., and Manhès, G.: Evaporation and Sublimation of Boric Acid: Application for Boron Purification from Organic Rich Solutions, Geostand. Newsl., 25, 67–75, https://doi.org/10.1111/j.1751-908X.2001.tb00788.x, 2001.
Goyet, C., Healy, R., Ryan, J., and Kozyr, A.: Global Distribution of Total
Inorganic Carbon and Total Alkalinity below the Deepest Winter Mixed Layer
Depths, ORNL/CDIAC-127, NDP-076, Carbon Dioxide Information Analysis
Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge,
USA, available at:
https://digital.library.unt.edu/ark:/67531/metadc724552/m1/7/ (last access: 18 May 2017), 2000.
Gray, W. R. and Evans, D.: Nonthermal Influences on Mg/Ca in Planktonic
Foraminifera: A Review of Culture Studies and Application to the Last
Glacial Maximum, Paleocean. Paleoclimat., 34, 306–315,
https://doi.org/10.1029/2018PA003517, 2019.
Greenop, R., Foster, G. L., Wilson, P. A., and Lear, C. H.: Middle Miocene
climate instability associated with high-amplitude CO2 variability,
Paleoceanography, 29, 2014PA002653, https://doi.org/10.1002/2014PA002653, 2014.
Greenop, R., Hain, M. P., Sosdian, S. M., Oliver, K. I. C., Goodwin, P., Chalk, T. B., Lear, C. H., Wilson, P. A., and Foster, G. L.: A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera, Clim. Past, 13, 149–170, https://doi.org/10.5194/cp-13-149-2017, 2017.
Greenop, R., Sosdian, S. M., Henehan, M. J., Wilson, P. A., Lear, C. H., and
Foster, G. L.: Orbital Forcing, Ice Volume, and CO2 Across the
Oligocene-Miocene Transition, Paleocean. Paleoclimat., 34, 316–328,
https://doi.org/10.1029/2018PA003420, 2019.
Hain, M. P., Sigman, D. M., Higgins, J. A., and Haug, G. H.: The effects of
secular calcium and magnesium concentration changes on the thermodynamics of
seawater acid/base chemistry: Implications for Eocene and Cretaceous ocean
carbon chemistry and buffering, Global Biogeochem. Cy., 29, 517–533,
https://doi.org/10.1002/2014GB004986, 2015.
Hain, M. P., Sigman, D. M., Higgins, J. A., and Haug, G. H.: Response to
Comment by Zeebe and Tyrrell on “The Effects of Secular Calcium and
Magnesium Concentration Changes on the Thermodynamics of Seawater Acid/Base
Chemistry: Implications for the Eocene and Cretaceous Ocean Carbon Chemistry
and Buffering”, Global Biogeochem. Cy., 32, 898–901,
https://doi.org/10.1002/2018GB005931, 2018.
Henehan, M. J., Foster, G. L., Bostock, H. C., Greenop, R., Marshall, B. J.,
and Wilson, P. A.: A new boron isotope-pH calibration for Orbulina universa, with
implications for understanding and accounting for “vital effects”, Earth
Planet. Sci. Lett., 454, 282–292, https://doi.org/10.1016/j.epsl.2016.09.024, 2016.
Heureux, A. M. C. and Rickaby, R. E. M.: Refining our estimate of
atmospheric CO2 across the Eocene-Oligocene climatic transition, Earth
Planet. Sci. Lett., 409, 329–338, https://doi.org/10.1016/j.epsl.2014.10.036, 2015.
Hodell, D. A. and Woodruff, F.: Variations in the strontium isotopic ratio
of seawater during the Miocene: Stratigraphic and geochemical implications,
Paleoceanography, 9, 405–426, https://doi.org/10.1029/94PA00292,
1994.
Holbourn, A., Kuhnt, W., Simo, J. A., and Li, Q.: Middle Miocene
isotope stratigraphy and paleoceanographic evolution of the northwest and
southwest Australian margins (Wombat Plateau and Great Australian Bight),
Paleogeogr. Paleoclimatol., 208, 1–22,
https://doi.org/10.1016/j.palaeo.2004.02.003, 2004.
Holbourn, A., Kuhnt, W., Schulz, M., and Erlenkeuser, H.: Impacts of orbital
forcing and atmospheric carbon dioxide on Miocene ice-sheet expansion,
Nature, 438, 483–487, https://doi.org/10.1038/nature04123, 2005.
Holbourn, A., Kuhnt, W., Schulz, M., Flores, J.-A., and Andersen, N.:
Orbitally-paced climate evolution during the middle Miocene “Monterey”
carbon-isotope excursion, Earth Planet. Sci. Lett., 261, 534–550,
https://doi.org/10.1016/j.epsl.2007.07.026, 2007.
Holbourn, A., Kuhnt, W., Frank, M., and Haley, B. A.: Changes in Pacific
Ocean circulation following the Miocene onset of permanent Antarctic ice
cover, Earth Planet. Sci. Lett., 365, 38–50,
https://doi.org/10.1016/j.epsl.2013.01.020, 2013.
Holbourn, A., Kuhnt, W., Lyle, M., Schneider, L., Romero, O., and Andersen,
N.: Middle Miocene climate cooling linked to intensification of eastern
equatorial Pacific upwelling, Geology, 42, 19–22, https://doi.org/10.1130/G34890.1,
2014.
Horita, J., Zimmermann, H., and Holland, H. D.: Chemical evolution of
seawater during the Phanerozoic: Implications from the record of marine
evaporites, Geochim. Cosmochim. Ac., 66, 3733–3756,
https://doi.org/10.1016/S0016-7037(01)00884-5, 2002.
Ji, S., Nie, J., Lechler, A., Huntington, K. W., Heitmann, E. O., and
Breecker, D. O.: A symmetrical CO2 peak and asymmetrical climate change
during the middle Miocene, Earth Planet. Sci. Lett., 499, 134–144,
https://doi.org/10.1016/j.epsl.2018.07.011, 2018.
Jonkers, L. and Kučera, M.: Global analysis of seasonality in the shell flux of extant planktonic Foraminifera, Biogeosciences, 12, 2207–2226, https://doi.org/10.5194/bg-12-2207-2015, 2015.
Knorr, G. and Lohmann, G.: Climate warming during Antarctic ice sheet
expansion at the Middle Miocene transition, Nat. Geosci., 7, 376–381,
https://doi.org/10.1038/ngeo2119, 2014.
Kölling, M., Bouimetarhan, I., Bowles, M. W., Felis, T., Goldhammer, T.,
Hinrichs, K.-U., Schulz, M., and Zabel, M.: Consistent CO2 release by
pyrite oxidation on continental shelves prior to glacial terminations,
Nat. Geosci., 12, 929–934, https://doi.org/10.1038/s41561-019-0465-9, 2019.
Kroon, D., Williams, T., Pirmez, C., Spezzaferri, S., Sato, T., and Wright,
J. D.: Coupled early Pliocene-middle Miocene bio-cyclostratigraphy of Site 1006 reveals orbitally induced cyclicity patterns of Great Bahama Bank
carbonate production, Proceedings of the Ocean Drilling Program, 166, 155–166, https://doi.org/10.2973/odp.proc.sr.166.127.2000, 2000.
Kuhnert, H., Bickert, T., and Paulsen, H.: Southern Ocean frontal system
changes precede Antarctic ice sheet growth during the middle Miocene, Earth
Planet. Sci. Lett., 284, 630–638, https://doi.org/10.1016/j.epsl.2009.05.030,
2009.
Kürschner, W. M., Kvaček, Z., and Dilcher, D. L.: The impact of
Miocene atmospheric carbon dioxide fluctuations on climate and the evolution
of terrestrial ecosystems, P. Natl. Acad. Sci., 105, 449–453,
https://doi.org/10.1073/pnas.0708588105, 2008.
Laskar, J., Robutel, P., Joutel, F., Gastineau, M., Correia, A. C. M., and
Levrard, B.: A long-term numerical solution for the insolation quantities of
the Earth, Astron. Astrophys., 428, 25, https://doi.org/10.1051/0004-6361:20041335,
2004.
Lavigne, H., Epitalon, J.-M., and Gattuso, J.-P.: seacarb: seawater carbonate
chemistry with R., available at:
http://CRAN.R-project.org/package=seacarb (last access: 30 October 2020), 2011.
Lear, C. H., Rosenthal, Y., Coxall, H. K., and Wilson, P. A.: Late Eocene to
early Miocene ice sheet dynamics and the global carbon cycle,
Paleoceanography, 19, PA4015, https://doi.org/10.1029/2004PA001039, 2004.
Lear, C. H., Mawbey, E. M., and Rosenthal, Y.: Cenozoic benthic foraminiferal
Mg/Ca and Li/Ca records: Toward unlocking temperatures and saturation
states, Paleoceanography, 25, PA4215, https://doi.org/10.1029/2009PA001880, 2010.
Lemarchand, D., Gaillardet, J., Lewin, É., and Allègre, C. J.: The
influence of rivers on marine boron isotopes and implications for
reconstructing past ocean pH, Nature, 408, 951–954, https://doi.org/10.1038/35050058,
2000.
Leutert, T. J., Auderset, A., Martínez-García, A., Modestou, S.,
and Meckler, A. N.: Coupled Southern Ocean cooling and Antarctic ice sheet
expansion during the middle Miocene, Nat. Geosci., 13, 634–639,
https://doi.org/10.1038/s41561-020-0623-0, 2020.
Lowenstein, T. K., Hardie, L. A., Timofeeff, M. N., and Demicco, R. V.:
Secular variation in seawater chemistry and the origin of calcium chloride
basinal brines, Geology, 31, 857–860, https://doi.org/10.1130/G19728R.1, 2003.
Ma, W., Tian, J., Li, Q., and Wang, P.: Simulation of long eccentricity
(400-kyr) cycle in ocean carbon reservoir during Miocene Climate Optimum:
Weathering and nutrient response to orbital change, Geophys. Res. Lett.,
38, L10701, https://doi.org/10.1029/2011GL047680, 2011.
Ma, X., Tian, J., Ma, W., Li, K., and Yu, J.: Changes of deep Pacific
overturning circulation and carbonate chemistry during middle Miocene East
Antarctic ice sheet expansion, Earth Planet. Sci. Lett., 484, 253–263,
https://doi.org/10.1016/j.epsl.2017.12.002, 2018.
Martínez-Botí, M. A., Marino, G., Foster, G. L., Ziveri, P.,
Henehan, M. J., Rae, J. W. B., Mortyn, P. G., and Vance, D.: Boron isotope
evidence for oceanic carbon dioxide leakage during the last deglaciation,
Nature, 518, 219–222, https://doi.org/10.1038/nature14155, 2015.
Mashiotta, T. A., Lea, D. W., and Spero, H. J.: Glacial-interglacial changes
in Subantarctic sea surface temperature and δ18O-water using
foraminiferal Mg, Earth Planet. Sci Lett., 170, 417–432,
https://doi.org/10.1016/S0012-821X(99)00116-8, 1999.
McKay, D. I. A., Tyrrell, T., and Wilson, P. A.: Global carbon cycle
perturbation across the Eocene-Oligocene climate transition,
Paleoceanography, 31, 311–329, https://doi.org/10.1002/2015PA002818, 2016.
Misra, S., Owen, R., Kerr, J., Greaves, M., and Elderfield, H.: Determination
of δ11B by HR-ICP-MS from mass limited samples: Application to
natural carbonates and water samples, Geochim. Cosmochim. Ac., 140,
531–552, https://doi.org/10.1016/j.gca.2014.05.047, 2014.
Mortyn, P. G. and Charles, C. D.: Planktonic foraminiferal depth habitat and
δ18O calibrations: Plankton tow results from the Atlantic
sector of the Southern Ocean, Paleoceanography, 18, 1037,
https://doi.org/10.1029/2001PA000637, 2003.
Myers, S. R.: Astrochron: An R Package for Astrochronology, available at: https://cran.r-project.org/package=astrochron (last access: 8 January 2019), 2014.
Ohneiser, C. and Wilson, G. S.: Eccentricity-Paced Southern Hemisphere
Glacial-Interglacial Cyclicity Preceding the Middle Miocene Climatic
Transition, Paleocean. Paleoclimat., 33, https://doi.org/10.1029/2017PA003278, 2018.
Pagani, M., Freeman, K. H., and Arthur, M. A.: Late Miocene Atmospheric
CO2 Concentrations and the Expansion of C4 Grasses, Science, 285,
876–879, https://doi.org/10.1126/science.285.5429.876, 1999.
Paillard, D. and Donnadieu, Y.: A 100 Myr history of the carbon cycle based
on the 400 kyr cycle in marine δ13C benthic records,
Paleoceanography, 29, 1249–1255,
https://doi.org/10.1002/2014PA002693, 2014.
Paulsen, H.: Miocene changes in the vertical structure of the Southeast
Atlantic near-surface water column: Influence on the paleoproductivity, PhD
thesis, Universität Bremen, FB Geowissenschaften, Bremen, Germany, available at: https://media.suub.uni-bremen.de/handle/elib/2188 (last access: 24 November 2020), 2005.
Pearson, P. N. and Palmer, M. R.: Atmospheric carbon dioxide concentrations
over the past 60 million years, Nature, 406, 695–699, https://doi.org/10.1038/35021000,
2000.
Pearson, P. N., Foster, G. L., and Wade, B. S.: Atmospheric carbon dioxide
through the Eocene-Oligocene climate transition, Nature, 461,
1110–1113, https://doi.org/10.1038/nature08447, 2009.
Rae, J. W. B., Foster, G. L., Schmidt, D. N., and Elliott, T.: Boron isotopes
and B/Ca in benthic foraminifera: Proxies for the deep ocean carbonate
system, Earth Planet. Sci. Lett., 302, 403–413,
https://doi.org/10.1016/j.epsl.2010.12.034, 2011.
Raitzsch, M. and Hönisch, B.: Cenozoic boron isotope variations in
benthic foraminifers, Geology, 41, 591–594,
https://doi.org/10.1130/G34031.1, 2013.
Raitzsch, M., Kuhnert, H., Groeneveld, J., and Bickert, T.: Benthic
foraminifer Mg/Ca anomalies in South Atlantic core top sediments and their
implications for paleothermometry, Geochem. Geophy. Geosy., 9, Q05010,
https://doi.org/10.1029/2007GC001788, 2008.
Raitzsch, M., Bijma, J., Benthien, A., Richter, K.-U., Steinhoefel, G., and
Kučera, M.: Boron isotope-based seasonal paleo-pH reconstruction for the
Southeast Atlantic – A multispecies approach using habitat preference of
planktonic foraminifera, Earth Planet. Sci. Lett., 487, 138–150,
https://doi.org/10.1016/j.epsl.2018.02.002, 2018.
Raitzsch, M., Rollion-Bard, C., Horn, I., Steinhoefel, G., Benthien, A., Richter, K.-U., Buisson, M., Louvat, P., and Bijma, J.: Technical note: Single-shell δ11B analysis of Cibicidoides wuellerstorfi using femtosecond laser ablation MC-ICPMS and secondary ion mass spectrometry, Biogeosciences, 17, 5365–5375, https://doi.org/10.5194/bg-17-5365-2020, 2020.
Reolid, J., Betzler, C., and Lüdmann, T.: The record of Oligocene –
Middle Miocene paleoenvironmental changes in a carbonate platform (IODP Exp.
359, Maldives, Indian Ocean), Mar. Geol., 412, 199–216,
https://doi.org/10.1016/j.margeo.2019.03.011, 2019.
Reuning, L., Reijmer, J. J. G., and Betzler, C.: Sedimentation cycles and
their diagenesis on the slope of a Miocene carbonate ramp (Bahamas, ODP Leg
166), Mar. Geol., 185, 121–142, https://doi.org/10.1016/S0025-3227(01)00293-6, 2002.
Ridgwell, A.: A Mid Mesozoic Revolution in the regulation of ocean
chemistry, Mar. Geol., 217, 339–357, https://doi.org/10.1016/j.margeo.2004.10.036,
2005.
Shackleton, N. J.: Attainment of isotopic equilibrium between ocean water
and the benthonic foraminifera genus Uvigerina: isotopic changes in the ocean during
the last glacial, Cent. Nat. Rech. Sci. Colloq. Int., 219, 203–209, 1974.
Shevenell, A. E. and Kennett, J. P.: Paleoceanographic Change During the
Middle Miocene Climate Revolution: An Antarctic Stable Isotope Perspective,
in: The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change
Between Australia and Antarctica, American Geophysical Union, Washington, DC, USA,
235–251, 2004.
Shevenell, A. E., Kennett, J. P., and Lea, D. W.: Middle Miocene Southern
Ocean Cooling and Antarctic Cryosphere Expansion, Science, 305, 1766–1770,
https://doi.org/10.1126/science.1100061, 2004.
Shevenell, A. E., Kennett, J. P., and Lea, D. W.: Middle Miocene ice sheet
dynamics, deep-sea temperatures, and carbon cycling: A Southern Ocean
perspective, Geochem. Geophy. Geosy., 9, Q02006,
https://doi.org/10.1029/2007GC001736, 2008.
Sosdian, S. M. and Lear, C. H.: Initiation of the Western Pacific Warm Pool
at the Middle Miocene Climate Transition?, Paleocean. Paleoclimat., 35,
e2020PA003920, https://doi.org/10.1029/2020PA003920, 2020.
Sosdian, S. M., Greenop, R., Hain, M. P., Foster, G. L., Pearson, P. N., and
Lear, C. H.: Constraining the evolution of Neogene ocean carbonate chemistry
using the boron isotope pH proxy, Earth Planet. Sci. Lett., 498, 362–376,
https://doi.org/10.1016/j.epsl.2018.06.017, 2018.
Sosdian, S. M., Babila, T. L., Greenop, R., Foster, G. L., and Lear, C. H.:
Ocean Carbon Storage across the middle Miocene: a new interpretation for the
Monterey Event, Nat. Commun., 11, 1–11, https://doi.org/10.1038/s41467-019-13792-0,
2020.
Stoll, H. M., Guitian, J., Hernandez-Almeida, I., Mejia, L. M., Phelps, S.,
Polissar, P., Rosenthal, Y., Zhang, H., and Ziveri, P.: Upregulation of
phytoplankton carbon concentrating mechanisms during low CO2 glacial
periods and implications for the phytoplankton pCO2 proxy, Quat. Sci.
Rev., 208, 1–20, https://doi.org/10.1016/j.quascirev.2019.01.012, 2019.
Super, J. R., Thomas, E., Pagani, M., Huber, M., O'Brien, C., and Hull, P.
M.: North Atlantic temperature and pCO2 coupling in the early-middle
Miocene, Geology, 46, 519–522, https://doi.org/10.1130/G40228.1, 2018.
Takahashi, T., Olafsson, J., Goddard, J. G., Chipman, D. W., and Sutherland,
S. C.: Seasonal variation of CO2 and nutrients in the high-latitude
surface oceans: A comparative study, Global Biogeochem. Cy., 7, 843–878,
https://doi.org/10.1029/93GB02263, 1993.
Takahashi, T., Sutherland, S. C., Wanninkhof, R., Sweeney, C., Feely, R. A.,
Chipman, D. W., Hales, B., Friederich, G., Chavez, F., Sabine, C., Watson,
A., Bakker, D. C. E., Schuster, U., Metzl, N., Yoshikawa-Inoue, H., Ishii,
M., Midorikawa, T., Nojiri, Y., Körtzinger, A., Steinhoff, T., Hoppema,
M., Olafsson, J., Arnarson, T. S., Tilbrook, B., Johannessen, T., Olsen, A.,
Bellerby, R., Wong, C. S., Delille, B., Bates, N. R., and de Baar, H. J. W.:
Climatological mean and decadal change in surface ocean pCO2, and net
sea-air CO2 flux over the global oceans, Deep-Sea Res., 56,
554–577, https://doi.org/10.1016/j.dsr2.2008.12.009, 2009.
Tian, J., Shevenell, A., Wang, P., Zhao, Q., Li, Q., and Cheng, X.:
Reorganization of Pacific Deep Waters linked to middle Miocene Antarctic
cryosphere expansion: A perspective from the South China Sea, Paleogeogr.
Paleoclimatol., 284, 375–382,
https://doi.org/10.1016/j.palaeo.2009.10.019, 2009.
Timofeeff, M. N., Lowenstein, T. K., da Silva, M. A. M., and Harris, N. B.:
Secular variation in the major-ion chemistry of seawater: Evidence from
fluid inclusions in Cretaceous halites, Geochim. Cosmochim. Ac., 70,
1977–1994, https://doi.org/10.1016/j.gca.2006.01.020, 2006.
Toggweiler, J. R.: Origin of the 100 000-year timescale in Antarctic
temperatures and atmospheric CO2, Paleoceanography, 23, PA2211,
https://doi.org/10.1029/2006PA001405, 2008.
Tyrrell, T. and Zeebe, R. E.: History of carbonate ion concentration over
the last 100 million years, Geochim. Cosmochim. Ac., 68, 3521–3530,
https://doi.org/10.1016/j.gca.2004.02.018, 2004.
van der Ploeg, R., Boudreau, B. P., Middelburg, J. J., and Sluijs, A.:
Cenozoic carbonate burial along continental margins, Geology, 47,
1025–1028, https://doi.org/10.1130/G46418.1, 2019.
Vincent, E. and Berger, W. H.: Carbon dioxide and polar cooling in the
Miocene: the Monterey hypothesis, in: The Carbon Cycle and Atmospheric
CO2: Natural Variations Archean to Present, edited by: Sundquist, E. T. and Broecker, W. S., American
Geophysical Union, Washington, USA,
455–468,
https://doi.org/10.1029/GM032p0455, 1985.
Wan, S., Kürschner, W. M., Clift, P. D., Li, A., and Li, T.: Extreme
weathering/erosion during the Miocene Climatic Optimum: Evidence from
sediment record in the South China Sea, Geophys. Res. Lett., 36, L19706,
https://doi.org/10.1029/2009GL040279, 2009.
Wang, B.-S., You, C.-F., Huang, K.-F., Wu, S.-F., Aggarwal, S. K., Chung,
C.-H., and Lin, P.-Y.: Direct separation of boron from Na- and Ca-rich
matrices by sublimation for stable isotope measurement by MC-ICP-MS,
Talanta, 82, 1378–1384, https://doi.org/10.1016/j.talanta.2010.07.010, 2010.
Wang, P.: Global monsoon in a geological perspective, Chin. Sci. Bull.,
54, 1113–1136, https://doi.org/10.1007/s11434-009-0169-4, 2009.
Williams, T., Kroon, D., and Spezzaferri, S.: Middle and Upper Miocene
cyclostratigraphy of downhole logs and short- to long-term astronomical
cycles in carbonate production of the Great Bahama Bank, Mar. Geol., 185,
75–93, https://doi.org/10.1016/S0025-3227(01)00291-2, 2002.
Woodruff, F. and Savin, S.: Mid-Miocene isotope stratigraphy in the deep
sea: high resolution correlations, paleoclimatic cycles, and sediment
preservation, Paleoceanography, 6, 755–806,
https://doi.org/10.1029/91PA02561, 1991.
Wright, J. D., Miller, K. G., and Fairbanks, R. G.: Early and Middle Miocene
stable isotopes: Implications for Deepwater circulation and climate,
Paleoceanography, 7, 357–389, https://doi.org/10.1029/92PA00760, 1992.
Zeebe, R. E. and Tyrrell, T.: History of carbonate ion concentration over
the last 100 million years II: Revised calculations and new data, Geochim.
Cosmochim. Ac., 257, 373–392, https://doi.org/10.1016/j.gca.2019.02.041, 2019.
Zeebe, R. E. and Wolf-Gladrow, D. A.: CO2 in Seawater: Equilibrium,
Kinetics, Isotopes, Elsevier Oceanography Series, Amsterdam, the Netherlands, 2001.
Short summary
At approximately 14 Ma, the East Antarctic Ice Sheet expanded to almost its current extent, but the role of CO2 in this major climate transition is not entirely known. We show that atmospheric CO2 might have varied on 400 kyr cycles linked to the eccentricity of the Earth’s orbit. The resulting change in weathering and ocean carbon cycle affected atmospheric CO2 in a way that CO2 rose after Antarctica glaciated, helping to stabilize the climate system on its way to the “ice-house” world.
At approximately 14 Ma, the East Antarctic Ice Sheet expanded to almost its current extent, but...
