Articles | Volume 17, issue 1
https://doi.org/10.5194/cp-17-469-2021
© 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-17-469-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Feb 2021
Research article |
| 19 Feb 2021
| 19 Feb 2021
Driving mechanisms of organic carbon burial in the Early Cretaceous South Atlantic Cape Basin (DSDP Site 361)
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
now at: Institute of Geosciences, Goethe University Frankfurt,
60438 Frankfurt am Main, Germany
Sebastian Steinig
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel,
Germany
now at: School of Geographical Sciences, University of Bristol,
Bristol, BS8 1SS, UK
Peter Hofmann
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
Matthias Lenz
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
Stephanie Kusch
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
Sascha Flögel
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel,
Germany
Jens Olaf Herrle
Institute of Geosciences, Goethe University Frankfurt, 60438 Frankfurt am
Main, Germany
Christian Hallmann
Max Planck Institute for Biogeochemistry, 07745 Jena, Germany
MARUM, University of Bremen, 28359 Bremen, Germany
Janet Rethemeyer
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
Haino Uwe Kasper
Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
Thomas Wagner
Lyell Centre, School of Energy, Geoscience, Infrastructure and
Society, Heriot-Watt University, Edinburgh, EH14 4AS, UK
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Rosie M. Sheward, Christina Gebühr, Jörg Bollmann, and Jens O. Herrle
EGUsphere, https://doi.org/10.5194/egusphere-2024-349, https://doi.org/10.5194/egusphere-2024-349, 2024
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How quickly do marine microorganisms respond to salinity stress? Our experiments with the calcifying marine plankton Emiliania huxleyi show that growth and cell morphology responded to salinity stress within as little as 24–48 hours, demonstrating that morphology and calcification is sensitive to salinity over a range of timescales. Our results have implications for understanding the short-term role of E. huxleyi in biogeochemical cycles and size-based paleoproxies for salinity.
Babette Hoogakker, Catherine Davis, Yi Wang, Stepanie Kusch, Katrina Nilsson-Kerr, Dalton Hardisty, Allison Jacobel, Dharma Reyes Macaya, Nicolaas Glock, Sha Ni, Julio Sepúlveda, Abby Ren, Alexandra Auderset, Anya Hess, Katrina Meissner, Jorge Cardich, Robert Anderson, Christine Barras, Chandranath Basak, Harold Bradbury, Inda Brinkmann, Alexis Castillo, Madelyn Cook, Kassandra Costa, Constance Choquel, Paula Diz, Jonas Donnenfield, Felix Elling, Zeynep Erdem, Helena Filipsson, Sebastian Garrido, Julia Gottschalk, Anjaly Govindankutty Menon, Jeroen Groeneveld, Christian Hallman, Ingrid Hendy, Rick Hennekam, Wanyi Lu, Jean Lynch-Stieglitz, Lelia Matos, Alfredo Martínez-García, Giulia Molina, Práxedes Muñoz, Simone Moretti, Jennifer Morford, Sophie Nuber, Svetlana Radionovskaya, Morgan Raven, Christopher Somes, Anja Studer, Kazuyo Tachikawa, Raúl Tapia, Martin Tetard, Tyler Vollmer, Shuzhuang Wu, Yan Zhang, Xin-Yuan Zheng, and Yuxin Zhou
EGUsphere, https://doi.org/10.5194/egusphere-2023-2981, https://doi.org/10.5194/egusphere-2023-2981, 2024
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Paleo-oxygen proxies can extend current records, bound pre-anthropogenic baselines, provide datasets necessary to test climate models under different boundary conditions, and ultimately understand how ocean oxygenation responds on longer timescales. Here we summarize current proxies used for the reconstruction of Cenozoic seawater oxygen levels. This includes an overview of the proxy's history, how it works, resources required, limitations, and future recommendations.
Sebastian Steinig, Wolf Dummann, Peter Hofmann, Martin Frank, Wonsun Park, Thomas Wagner, and Sascha Flögel
EGUsphere, https://doi.org/10.5194/egusphere-2023-2732, https://doi.org/10.5194/egusphere-2023-2732, 2023
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The opening of the South Atlantic Ocean, starting ~140 million years ago, had the potential to influence the global carbon cycle and climate trends. We use 36 climate model experiments to simulate the evolution of ocean circulation in this narrow basin. We test different combinations of paleogeographic and atmospheric CO2 reconstructions with geochemical data to not only quantify the influence of individual processes on ocean circulation, but also to find non-linear interactions between them.
Stephanie Scheidt, Matthias Lenz, Ramon Egli, Dominik Brill, Martin Klug, Karl Fabian, Marlene M. Lenz, Raphael Gromig, Janet Rethemeyer, Bernd Wagner, Grigory Federov, and Martin Melles
Geochronology, 4, 87–107, https://doi.org/10.5194/gchron-4-87-2022, https://doi.org/10.5194/gchron-4-87-2022, 2022
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Levinson-Lessing Lake in northern central Siberia provides an exceptional opportunity to study the evolution of the Earth's magnetic field in the Arctic. This is the first study carried out at the lake that focus on the palaeomagnetic record. It presents the relative palaeointensity and palaeosecular variation of the upper 38 m of sediment core Co1401, spanning ~62 kyr. A comparable high-resolution record of this time does not exist in the Eurasian Arctic.
Fabian Kalks, Gabriel Noren, Carsten W. Mueller, Mirjam Helfrich, Janet Rethemeyer, and Axel Don
SOIL, 7, 347–362, https://doi.org/10.5194/soil-7-347-2021, https://doi.org/10.5194/soil-7-347-2021, 2021
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Sedimentary rocks contain organic carbon that may end up as soil carbon. However, this source of soil carbon is overlooked and has not been quantified sufficiently. We analysed 10 m long sediment cores with three different sedimentary rocks. All sediments contain considerable amounts of geogenic carbon contributing 3 %–12 % to the total soil carbon below 30 cm depth. The low 14C content of geogenic carbon can result in underestimations of soil carbon turnover derived from 14C data.
Jens O. Herrle, Cornelia Spiegel, Andreas Läufer, and Jean-Pierre Paul de Vera
Polarforschung, 89, 51–55, https://doi.org/10.5194/polf-89-51-2021, https://doi.org/10.5194/polf-89-51-2021, 2021
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The Geology and Geophysics working group is one the largest within the German Society of Polar Research. Here, we present an overview of the development of major scientific German polar research programs and locations as well as important white papers from the last decades. This work is based on the contributions of members and institutions, including the Alfred Wegener Institute, the Federal Institute for Geosciences and Natural Resources and German Universities with polar research programs.
James F. Spray, Thomas Wagner, Juliane Bischoff, Sara Trojahn, Sevda Norouzi, Walter Hill, Julian Brasche, Leroy James, and Ryan Pereira
Biogeosciences Discuss., https://doi.org/10.5194/bg-2021-92, https://doi.org/10.5194/bg-2021-92, 2021
Manuscript not accepted for further review
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Sunlight and microbial activity break down river dissolved organic matter (DOM), releasing greenhouse gases, but are poorly understood in tropical headwaters. We incubated water in light and darkness, using novel methods to quantify changes in DOM concentration and character. Light removed up to 9 % of DOM, but microbial activity had a varied response. Importantly, light affected DOM compounds considered photo-resistant; likewise microbial activity degraded compounds thought to be bio-resistant.
Daniel J. Lunt, Fran Bragg, Wing-Le Chan, David K. Hutchinson, Jean-Baptiste Ladant, Polina Morozova, Igor Niezgodzki, Sebastian Steinig, Zhongshi Zhang, Jiang Zhu, Ayako Abe-Ouchi, Eleni Anagnostou, Agatha M. de Boer, Helen K. Coxall, Yannick Donnadieu, Gavin Foster, Gordon N. Inglis, Gregor Knorr, Petra M. Langebroek, Caroline H. Lear, Gerrit Lohmann, Christopher J. Poulsen, Pierre Sepulchre, Jessica E. Tierney, Paul J. Valdes, Evgeny M. Volodin, Tom Dunkley Jones, Christopher J. Hollis, Matthew Huber, and Bette L. Otto-Bliesner
Clim. Past, 17, 203–227, https://doi.org/10.5194/cp-17-203-2021, https://doi.org/10.5194/cp-17-203-2021, 2021
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This paper presents the first modelling results from the Deep-Time Model Intercomparison Project (DeepMIP), in which we focus on the early Eocene climatic optimum (EECO, 50 million years ago). We show that, in contrast to previous work, at least three models (CESM, GFDL, and NorESM) produce climate states that are consistent with proxy indicators of global mean temperature and polar amplification, and they achieve this at a CO2 concentration that is consistent with the CO2 proxy record.
Patrick Wordell-Dietrich, Anja Wotte, Janet Rethemeyer, Jörg Bachmann, Mirjam Helfrich, Kristina Kirfel, Christoph Leuschner, and Axel Don
Biogeosciences, 17, 6341–6356, https://doi.org/10.5194/bg-17-6341-2020, https://doi.org/10.5194/bg-17-6341-2020, 2020
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The release of CO2 from soils, known as soil respiration, plays a major role in the global carbon cycle. However, the contributions of different soil depths or the sources of soil CO2 have hardly been studied. We quantified the CO2 production for different soil layers (up to 1.5 m) in three soil profiles for 2 years. We found that 90 % of CO2 production occurs in the first 30 cm of the soil profile, and that the CO2 originated from young carbon sources, as revealed by radiocarbon measurements.
Gordon N. Inglis, Fran Bragg, Natalie J. Burls, Margot J. Cramwinckel, David Evans, Gavin L. Foster, Matthew Huber, Daniel J. Lunt, Nicholas Siler, Sebastian Steinig, Jessica E. Tierney, Richard Wilkinson, Eleni Anagnostou, Agatha M. de Boer, Tom Dunkley Jones, Kirsty M. Edgar, Christopher J. Hollis, David K. Hutchinson, and Richard D. Pancost
Clim. Past, 16, 1953–1968, https://doi.org/10.5194/cp-16-1953-2020, https://doi.org/10.5194/cp-16-1953-2020, 2020
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This paper presents estimates of global mean surface temperatures and climate sensitivity during the early Paleogene (∼57–48 Ma). We employ a multi-method experimental approach and show that i) global mean surface temperatures range between 27 and 32°C and that ii) estimates of
bulkequilibrium climate sensitivity (∼3 to 4.5°C) fall within the range predicted by the IPCC AR5 Report. This work improves our understanding of two key climate metrics during the early Paleogene.
Ulrike Hanz, Claudia Wienberg, Dierk Hebbeln, Gerard Duineveld, Marc Lavaleye, Katriina Juva, Wolf-Christian Dullo, André Freiwald, Leonardo Tamborrino, Gert-Jan Reichart, Sascha Flögel, and Furu Mienis
Biogeosciences, 16, 4337–4356, https://doi.org/10.5194/bg-16-4337-2019, https://doi.org/10.5194/bg-16-4337-2019, 2019
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Along the Namibian and Angolan margins, low oxygen conditions do not meet environmental ranges for cold–water corals and hence are expected to be unsuitable habitats. Environmental conditions show that tidal movements deliver water with more oxygen and high–quality organic matter, suggesting that corals compensate unfavorable conditions with availability of food. With the expected expansion of oxygen minimum zones in the future, this study provides an example how ecosystems cope with extremes.
Elizabeth Atar, Christian März, Andrew C. Aplin, Olaf Dellwig, Liam G. Herringshaw, Violaine Lamoureux-Var, Melanie J. Leng, Bernhard Schnetger, and Thomas Wagner
Clim. Past, 15, 1581–1601, https://doi.org/10.5194/cp-15-1581-2019, https://doi.org/10.5194/cp-15-1581-2019, 2019
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We present a geochemical and petrographic study of the Kimmeridge Clay Formation from the Cleveland Basin (Yorkshire, UK). Our results indicate that deposition during this interval was very dynamic and oscillated between three distinct modes of sedimentation. In line with recent modelling results, we propose that these highly dynamic conditions were driven by changes in climate, which affected continental weathering, enhanced primary productivity, and led to organic carbon enrichment.
Bernd Wagner, Thomas Wilke, Alexander Francke, Christian Albrecht, Henrike Baumgarten, Adele Bertini, Nathalie Combourieu-Nebout, Aleksandra Cvetkoska, Michele D'Addabbo, Timme H. Donders, Kirstin Föller, Biagio Giaccio, Andon Grazhdani, Torsten Hauffe, Jens Holtvoeth, Sebastien Joannin, Elena Jovanovska, Janna Just, Katerina Kouli, Andreas Koutsodendris, Sebastian Krastel, Jack H. Lacey, Niklas Leicher, Melanie J. Leng, Zlatko Levkov, Katja Lindhorst, Alessia Masi, Anna M. Mercuri, Sebastien Nomade, Norbert Nowaczyk, Konstantinos Panagiotopoulos, Odile Peyron, Jane M. Reed, Eleonora Regattieri, Laura Sadori, Leonardo Sagnotti, Björn Stelbrink, Roberto Sulpizio, Slavica Tofilovska, Paola Torri, Hendrik Vogel, Thomas Wagner, Friederike Wagner-Cremer, George A. Wolff, Thomas Wonik, Giovanni Zanchetta, and Xiaosen S. Zhang
Biogeosciences, 14, 2033–2054, https://doi.org/10.5194/bg-14-2033-2017, https://doi.org/10.5194/bg-14-2033-2017, 2017
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Lake Ohrid is considered to be the oldest existing lake in Europe. Moreover, it has a very high degree of endemic biodiversity. During a drilling campaign at Lake Ohrid in 2013, a 569 m long sediment sequence was recovered from Lake Ohrid. The ongoing studies of this record provide first important information on the environmental and evolutionary history of the lake and the reasons for its high endimic biodiversity.
Lutz Schirrmeister, Georg Schwamborn, Pier Paul Overduin, Jens Strauss, Margret C. Fuchs, Mikhail Grigoriev, Irina Yakshina, Janet Rethemeyer, Elisabeth Dietze, and Sebastian Wetterich
Biogeosciences, 14, 1261–1283, https://doi.org/10.5194/bg-14-1261-2017, https://doi.org/10.5194/bg-14-1261-2017, 2017
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We investigate late Pleistocene permafrost at the Buor Khaya Peninsula (Laptev Sea, Siberia) for cryolithological, geochemical, and geochronological parameters. The sequences were composed of ice-oversaturated silts and fine-grained sands with 0.2 to 24 wt% of organic matter. The deposition was between 54.1 and 9.7 kyr BP. Due to coastal erosion, the biogeochemical signature of the deposits represents the terrestrial end-member, and is related to organic matter deposited in the marine realm.
J. Holtvoeth, D. Rushworth, H. Copsey, A. Imeri, M. Cara, H. Vogel, T. Wagner, and G. A. Wolff
Biogeosciences, 13, 795–816, https://doi.org/10.5194/bg-13-795-2016, https://doi.org/10.5194/bg-13-795-2016, 2016
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Lake Ohrid is situated in the southern Balkans between Albania and Macedonia. It is a unique ecosystem with remarkable biodiversity and a sediment record of past climates that goes back more than a million years. Detailed reconstructions of past climate development and human alteration of the environment require underpinned and so in this study we go the present-day lake vegetation and catchment soils and test new proxies over one of the known recent cooling events of the region 8200 years ago.
Stephan John, Gerrit Angst, Kristina Kirfel, Sebastian Preusser, Carsten W. Mueller, Christoph Leuschner, Ellen Kandeler, and Janet Rethemeyer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-11, https://doi.org/10.5194/bg-2016-11, 2016
Manuscript not accepted for further review
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In this manuscript we investigate chemical, biological and physical soil parameters and their influence on 14C contents and distribution in three nearby soil profiles under beech forest. We found a large heterogeneity in 14C contents in the profiles, mainly caused by the abundance of roots. Our results indicate that 14C analysis of individual soil profiles – as it is done in most studies – may lead to misleading assumptions of SOM turnover in soils when extrapolated on larger areas.
J. Schönfeld, W. Kuhnt, Z. Erdem, S. Flögel, N. Glock, M. Aquit, M. Frank, and A. Holbourn
Biogeosciences, 12, 1169–1189, https://doi.org/10.5194/bg-12-1169-2015, https://doi.org/10.5194/bg-12-1169-2015, 2015
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Today’s oceans show distinct mid-depth oxygen minima while whole oceanic basins became transiently anoxic in the Mesozoic. To constrain past bottom-water oxygenation, we compared sediments from the Peruvian OMZ with the Cenomanian OAE 2 from Morocco. Corg accumulation rates in laminated OAE 2 sections match Holocene rates off Peru. Laminated deposits are found at oxygen levels of < 7µmol kg-1; crab burrows appear at 10µmol kg-1 today, both defining threshold values for palaeoreconstructions.
J. Raddatz, A. Rüggeberg, S. Flögel, E. C. Hathorne, V. Liebetrau, A. Eisenhauer, and W.-Chr. Dullo
Biogeosciences, 11, 1863–1871, https://doi.org/10.5194/bg-11-1863-2014, https://doi.org/10.5194/bg-11-1863-2014, 2014
V. Foerster, A. Junginger, A. Asrat, H. F. Lamb, M. Weber, J. Rethemeyer, U. Frank, M. C. Brown, M. H. Trauth, and F. Schaebitz
Clim. Past Discuss., https://doi.org/10.5194/cpd-10-977-2014, https://doi.org/10.5194/cpd-10-977-2014, 2014
Revised manuscript not accepted
S. Höfle, J. Rethemeyer, C. W. Mueller, and S. John
Biogeosciences, 10, 3145–3158, https://doi.org/10.5194/bg-10-3145-2013, https://doi.org/10.5194/bg-10-3145-2013, 2013
A. Francke, B. Wagner, M. J. Leng, and J. Rethemeyer
Clim. Past, 9, 481–498, https://doi.org/10.5194/cp-9-481-2013, https://doi.org/10.5194/cp-9-481-2013, 2013
M. Damaschke, R. Sulpizio, G. Zanchetta, B. Wagner, A. Böhm, N. Nowaczyk, J. Rethemeyer, and A. Hilgers
Clim. Past, 9, 267–287, https://doi.org/10.5194/cp-9-267-2013, https://doi.org/10.5194/cp-9-267-2013, 2013
Related subject area
Subject: Carbon Cycle | Archive: Marine Archives | Timescale: Pre-Cenozoic
Warming drove the expansion of marine anoxia in the equatorial Atlantic during the Cenomanian leading up to Oceanic Anoxic Event 2
Cretaceous oceanic anoxic events prolonged by phosphorus cycle feedbacks
Dynamic climate-driven controls on the deposition of the Kimmeridge Clay Formation in the Cleveland Basin, Yorkshire, UK
Latest Permian carbonate carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation
Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic
Late Cretaceous (late Campanian–Maastrichtian) sea-surface temperature record of the Boreal Chalk Sea
Freshwater discharge controlled deposition of Cenomanian–Turonian black shales on the NW European epicontinental shelf (Wunstorf, northern Germany)
"OAE 3" – regional Atlantic organic carbon burial during the Coniacian–Santonian
Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys
Mohd Al Farid Abraham, Bernhard David A. Naafs, Vittoria Lauretano, Fotis Sgouridis, and Richard D. Pancost
Clim. Past, 19, 2569–2580, https://doi.org/10.5194/cp-19-2569-2023, https://doi.org/10.5194/cp-19-2569-2023, 2023
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Oceanic Anoxic Event 2 (OAE 2), about 93.5 million years ago, is characterized by widespread deoxygenated ocean and massive burial of organic-rich sediments. Our results show that the marine deoxygenation at the equatorial Atlantic that predates the OAE 2 interval was driven by global warming and associated with the nutrient status of the site, with factors like temperature-modulated upwelling and hydrology-induced weathering contributing to enhanced nutrient delivery over various timescales.
Sebastian Beil, Wolfgang Kuhnt, Ann Holbourn, Florian Scholz, Julian Oxmann, Klaus Wallmann, Janne Lorenzen, Mohamed Aquit, and El Hassane Chellai
Clim. Past, 16, 757–782, https://doi.org/10.5194/cp-16-757-2020, https://doi.org/10.5194/cp-16-757-2020, 2020
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Comparison of Cretaceous OAE1a and OAE2 in two drill cores with unusually high sedimentation rates shows that long-lasting negative δ13C excursions precede the positive δ13C excursions and that the evolution of the marine δ13C positive excursions is similar during both OAEs, although the durations of individual phases differ substantially. Phosphorus speciation data across OAE2 and the Mid-Cenomanian Event suggest a positive feedback loop, enhancing marine productivity during OAEs.
Elizabeth Atar, Christian März, Andrew C. Aplin, Olaf Dellwig, Liam G. Herringshaw, Violaine Lamoureux-Var, Melanie J. Leng, Bernhard Schnetger, and Thomas Wagner
Clim. Past, 15, 1581–1601, https://doi.org/10.5194/cp-15-1581-2019, https://doi.org/10.5194/cp-15-1581-2019, 2019
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We present a geochemical and petrographic study of the Kimmeridge Clay Formation from the Cleveland Basin (Yorkshire, UK). Our results indicate that deposition during this interval was very dynamic and oscillated between three distinct modes of sedimentation. In line with recent modelling results, we propose that these highly dynamic conditions were driven by changes in climate, which affected continental weathering, enhanced primary productivity, and led to organic carbon enrichment.
Martin Schobben, Sebastiaan van de Velde, Jana Gliwa, Lucyna Leda, Dieter Korn, Ulrich Struck, Clemens Vinzenz Ullmann, Vachik Hairapetian, Abbas Ghaderi, Christoph Korte, Robert J. Newton, Simon W. Poulton, and Paul B. Wignall
Clim. Past, 13, 1635–1659, https://doi.org/10.5194/cp-13-1635-2017, https://doi.org/10.5194/cp-13-1635-2017, 2017
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Stratigraphic trends in the carbon isotope composition of calcium carbonate rock can be used as a stratigraphic tool. An important assumption when using these isotope chemical records is that they record a globally universal signal of marine water chemistry. We show that carbon isotope scatter on a confined centimetre stratigraphic scale appears to represent a signal of microbial activity. However, long-term carbon isotope trends are still compatible with a primary isotope imprint.
James S. Eldrett, Paul Dodsworth, Steven C. Bergman, Milly Wright, and Daniel Minisini
Clim. Past, 13, 855–878, https://doi.org/10.5194/cp-13-855-2017, https://doi.org/10.5194/cp-13-855-2017, 2017
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This contribution integrates new data on the main components of organic matter, geochemistry, and stable isotopes for the Cenomanian to Coniacian stages of the Late Cretaceous, along a north–south transect from the Cretaceous Western Interior Seaway to the equatorial western Atlantic and Southern Ocean. Distinct palynological assemblages and geochemical signatures allow insights into palaeoenvironmental conditions and water-mass evolution during this greenhouse climate period.
Nicolas Thibault, Rikke Harlou, Niels H. Schovsbo, Lars Stemmerik, and Finn Surlyk
Clim. Past, 12, 429–438, https://doi.org/10.5194/cp-12-429-2016, https://doi.org/10.5194/cp-12-429-2016, 2016
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We present here for the first time a very high-resolution record of sea-surface temperature changes in the Boreal Chalk Sea for the last 8 million years of the Cretaceous. This record was obtained from 1932 bulk oxygen isotope measurements, and their interpretation into temperature trends is validated by similar trends observed from changes in phytoplankton assemblages.
N. A. G. M. van Helmond, A. Sluijs, J. S. Sinninghe Damsté, G.-J. Reichart, S. Voigt, J. Erbacher, J. Pross, and H. Brinkhuis
Clim. Past, 11, 495–508, https://doi.org/10.5194/cp-11-495-2015, https://doi.org/10.5194/cp-11-495-2015, 2015
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Based on the chemistry and microfossils preserved in sediments deposited in a shallow sea, in the current Lower Saxony region (NW Germany), we conclude that changes in Earth’s orbit around the Sun led to enhanced rainfall and organic matter production. The additional supply of organic matter, depleting oxygen upon degradation, and freshwater, inhibiting the mixing of oxygen-rich surface waters with deeper waters, caused the development of oxygen-poor waters about 94 million years ago.
M. Wagreich
Clim. Past, 8, 1447–1455, https://doi.org/10.5194/cp-8-1447-2012, https://doi.org/10.5194/cp-8-1447-2012, 2012
K. B. Föllmi, M. Bôle, N. Jammet, P. Froidevaux, A. Godet, S. Bodin, T. Adatte, V. Matera, D. Fleitmann, and J. E. Spangenberg
Clim. Past, 8, 171–189, https://doi.org/10.5194/cp-8-171-2012, https://doi.org/10.5194/cp-8-171-2012, 2012
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Short summary
This study investigates the climatic mechanism that controlled the deposition of organic matter in the South Atlantic Cape Basin during the Early Cretaceous. The presented geochemical and climate modeling data suggest that fluctuations in riverine nutrient supply were the main driver of organic carbon burial on timescales < 1 Myr. Our results have implications for the understanding of Cretaceous atmospheric circulation patterns and climate-land-ocean interactions in emerging ocean basins.
This study investigates the climatic mechanism that controlled the deposition of organic matter...
