Orbital Forcing and Evolution of the Southern African Monsoon From Late Miocene to Early Pliocene

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  • Allana Queiroz de Azevedo
    Programa de Pós‐Graduação em Geoquímica Universidade Federal Fluminense Rio de Janeiro Brazil
  • Francisco J. Jiménez‐Espejo
    Instituto Andaluz de Ciencias de la Tierra Consejo Superior de Investigaciones Científicas‐Universidad de Granada Armilla Spain
  • Francesca Bulian
    Department of Geology Universidad de Salamanca Salamanca Spain
  • Francisco J. Sierro
    Department of Geology Universidad de Salamanca Salamanca Spain
  • Deborah Tangunan
    School of Earth and Environmental Sciences Cardiff University Cardiff UK
  • Yasuhiro Takashimizu
    Mathematical and Natural Sciences Niigata University Niigata Japan
  • Ana Luiza S. Albuquerque
    Programa de Pós‐Graduação em Geoquímica Universidade Federal Fluminense Rio de Janeiro Brazil
  • Kaoru Kubota
    Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) Yokosuka Japan
  • Carlota Escutia
    Instituto Andaluz de Ciencias de la Tierra Consejo Superior de Investigaciones Científicas‐Universidad de Granada Armilla Spain
  • Richard D. Norris
    Scripps Institution of Oceanography University of California San Diego San Diego CA USA
  • Sidney R. Hemming
    Department of Earth and Environmental Sciences Lamont‐Doherty Earth Observatory New York NY USA
  • Ian R. Hall
    School of Earth and Environmental Sciences Cardiff University Cardiff UK

書誌事項

公開日
2023-08-29
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by-nc-nd/4.0/
DOI
  • 10.1029/2022pa004588
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The late Miocene‐early Pliocene (7.4‐4.5 Ma) is a key interval in Earth's history where intense reorganization of atmospheric and ocean circulation occurred within a global cooling scenario. The Southern African monsoon (SAFM) potentially played an important role in climate systems variability during this interval. However, the dynamics of this important atmospheric system is poorly understood due to the scarcity of continuous records. Here, we present an exceptional continuous late Miocene to early Pliocene reconstruction of SAFM based on elemental geochemistry (Ca/Ti and Si/K ratios), stable isotope geochemistry (δ<jats:sup>18</jats:sup>O and δ<jats:sup>13</jats:sup>C recorded in the planktonic foraminifera<jats:italic>Orbulina universa</jats:italic>), and marine sediment grain size data from the International Ocean Discovery Program (IODP) Site U1476 located at the entrance of the Mozambique Channel. Spectral characteristics of the Si/K ratio (fluvial input) was used to identify the main orbital forcing controlling SAFM. Precession cycles governed precipitation from 7.4 to ∼6.9 Ma and during the early Pliocene. From ∼6.9 to ∼5.9 Ma, the precession and long eccentricity cycles drove the SAFM. The major Antarctic ice sheet expansion across this interval appear to influence the isotopic records of<jats:italic>O. universa</jats:italic>imprinting its long‐term variability signal as a response to the ocean and atmospheric reorganization. Precession cycles markedly weakened from 5.9 to 5.3 Ma, almost the same period when the Mediterranean Outflow Water ceased. These findings highlight important teleconnections among the SAFM, Mediterranean Sea, and other tropical regions.</jats:p>

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