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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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...
