Articles | Volume 18, issue 4
https://doi.org/10.5194/cp-18-713-2022
© Author(s) 2022. 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-18-713-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Apr 2022
Research article |
| 08 Apr 2022
| 08 Apr 2022
Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, Aix-en-Provence, France
Emmeline Gray
Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, Aix-en-Provence, France
now at: School of Environment, Earth and Ecosystem Sciences, The Open University, Milton Keynes MK7 6AA, UK
Wolfgang Kuhnt
Institute of Geosciences, University of Kiel, 24118 Kiel, Germany
Ann E. Holbourn
Institute of Geosciences, University of Kiel, 24118 Kiel, Germany
Julia Lübbers
Institute of Geosciences, University of Kiel, 24118 Kiel, Germany
Katharine Grant
Research School of Earth Sciences, Australian National University, Canberra ACT 2601, Australia
Kazuyo Tachikawa
Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, Aix-en-Provence, France
Gianluca Marino
Research School of Earth Sciences, Australian National University, Canberra ACT 2601, Australia
Centro de Investigación Mariña, Universidade de Vigo, GEOMA, Palaeoclimatology Lab, Vigo, 36310, Spain
Eelco J. Rohling
Research School of Earth Sciences, Australian National University, Canberra ACT 2601, Australia
Ocean and Earth Science, University of Southampton, Southampton SO14 3ZH, UK
Anta-Clarisse Sarr
Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, Aix-en-Provence, France
Nils Andersen
Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, University of Kiel, 24118 Kiel, Germany
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Hongrui Zhang, Heather Stoll, Clara Bolton, Xiaobo Jin, and Chuanlian Liu
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The sinking speeds of coccoliths are relevant for laboratory methods to separate coccoliths for geochemical analysis. However, in the absence of estimates of coccolith settling velocity, previous implementations have depended mainly on time-consuming method development by trial and error. In this study, the sinking velocities of cocooliths were carefully measured for the first time. We also provide an estimation of coccolith sinking velocity by shape, which will make coccolith separation easier.
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At present, under low eccentricity, the tropical ocean experiences a limited seasonality. Based on eight climate simulations of sea surface temperature and primary production, we show that, during high-eccentricity times, significant seasons existed in the tropics due to annual changes in the Earth–Sun distance. Those tropical seasons are slowly shifting in the calendar year to be distinct from classical seasons. Their past dynamics should have influenced phenomena like ENSO and monsoons.
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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
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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.
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O. Cartapanis, K. Tachikawa, O. E. Romero, and E. Bard
Clim. Past, 10, 405–418, https://doi.org/10.5194/cp-10-405-2014, https://doi.org/10.5194/cp-10-405-2014, 2014
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Revised manuscript has not been submitted
Related subject area
Subject: Ocean Dynamics | Archive: Marine Archives | Timescale: Milankovitch
Distinct seasonal changes and precession forcing of surface and subsurface temperatures in the mid-latitudinal North Atlantic during the onset of the Late Pliocene
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Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes
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The East Asian winter monsoon variability in response to precession during the past 150 000 yr
Paleo Agulhas rings enter the subtropical gyre during the penultimate deglaciation
A 500 kyr record of global sea-level oscillations in the Gulf of Lion, Mediterranean Sea: new insights into MIS 3 sea-level variability
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Our research discovered significant seasonal temperature variations in the North Atlantic's mid-latitudes during the early Late Pliocene. This highlights the necessity of using multiple methods to get a full picture of past climates, thus avoiding a biased understanding of the climate system. Moreover, our study reveals that the precession signal, which previously dominated surface temperature records, disappeared with the increased influence of the ice sheets in the Northern Hemisphere.
Naroa Martinez-Braceras, Aitor Payros, Jaume Dinarès-Turell, Idoia Rosales, Javier Arostegi, and Roi Silva-Casal
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Robin Fentimen, Eline Feenstra, Andres Rüggeberg, Efraim Hall, Valentin Rime, Torsten Vennemann, Irka Hajdas, Antonietta Rosso, David Van Rooij, Thierry Adatte, Hendrik Vogel, Norbert Frank, and Anneleen Foubert
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Anastasia Zhuravleva and Henning A. Bauch
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New foraminiferal data from the Bahama region are used to investigate the mechanisms regulating subtropical climate. Our results suggest that the sensitivity of the low-latitude climate increased at times of enhanced sea-surface freshening in the subpolar North Atlantic. This has further implications for future climate development, given the ongoing melting of the Greenland ice sheet.
Mathieu Martinez, Sergey Kotov, David De Vleeschouwer, Damien Pas, and Heiko Pälike
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Identification of Milankovitch cycles within the sedimentary record depends on spectral analyses, but these can be biased because there are always slight uncertainties in the sample position within a sedimentary column. Here, we simulate uncertainties in the sample position and show that a tight control on the inter-sample distance together with a density of 6–12 samples per precession cycle are needed to accurately reconstruct the contribution of the orbital forcing on past climate changes.
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Clim. Past, 9, 2777–2788, https://doi.org/10.5194/cp-9-2777-2013, https://doi.org/10.5194/cp-9-2777-2013, 2013
P. Scussolini, E. van Sebille, and J. V. Durgadoo
Clim. Past, 9, 2631–2639, https://doi.org/10.5194/cp-9-2631-2013, https://doi.org/10.5194/cp-9-2631-2013, 2013
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Clim. Past, 8, 1067–1077, https://doi.org/10.5194/cp-8-1067-2012, https://doi.org/10.5194/cp-8-1067-2012, 2012
L. Beaufort, S. van der Kaars, F. C. Bassinot, and V. Moron
Clim. Past, 6, 695–706, https://doi.org/10.5194/cp-6-695-2010, https://doi.org/10.5194/cp-6-695-2010, 2010
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Short summary
The timing of the initiation and evolution of the South Asian monsoon in the geological past is a subject of debate. Here, we present a new age model spanning the late Miocene (9 to 5 million years ago) and high-resolution records of past open-ocean biological productivity from the equatorial Indian Ocean that we interpret to reflect monsoon wind strength. Our data show no long-term intensification; however, strong orbital periodicities suggest insolation forcing of monsoon wind strength.
The timing of the initiation and evolution of the South Asian monsoon in the geological past is...
