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Azevedo, Allana; Jiménez-Espejo, Francisco Jose; Bulian, Francesca; Sierro, Francisco Javier; Tangunan, Deborah N; Takashimizu, Yasuhiro; Albuquerque, Ana Luiza Spadano; Kubota, Kaoru; Escutia, Carlota; Norris, Richard D; Hemming, Sidney R; Hall, Ian R (2023): Orbital forcing and evolution of the Southern African Monsoon from IODP Site U1476 within latest Miocene (7.4 Ma) to early Pliocene (4.5 Ma) interval [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.961179

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Abstract:
Marine sediments from the western Indian Ocean are potentially an ideal archive for monitoring local changes in the Southern African Monsoon (SAFM) as riverine discharge fluctuations are controlled by monsoon precipitation linked to the Intertropical Convergence Zone movement. Regarding the pottential role played by the SAFM in climate systems from latest Miocene to early Pliocene, we reconstructed this monsoonal system based on elemental geochemistry (Ca/Ti and Si/K ratios), stable isotope geochemistry (δ18O and δ13C recorded in the planktonic foraminifera Orbulina universa), and marine sediment grain size data from the International Ocean Discovery Program Site U1476. Here we demonstrated that 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 Orbulina universa 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.
Related to:
Azevedo, Allana; Jiménez-Espejo, Francisco Jose; Bulian, Francesca; Sierro, Francisco Javier; Tangunan, Deborah N; Takashimizu, Yasuhiro; Albuquerque, Ana Luiza Spadano; Kubota, Kaoru; Escutia, Carlota; Norris, Richard D; Hemming, Sidney R; Hall, Ian R (2023): Orbital Forcing and Evolution of the Southern African Monsoon From Late Miocene to Early Pliocene. Paleoceanography and Paleoclimatology, 38(9), e2022PA004588, https://doi.org/10.1029/2022PA004588
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Funding:
Coordenação de Aperfeicoamento de Pessoal de Nível Superior (CAPES), grant/award no. 88887.372122/2019-00
Ministry of Economy, Industry and Competitiveness (MINECO), grant/award no. CTM2017-89711-C2-1-P
Coverage:
Latitude: -15.821000 * Longitude: 41.769000
Date/Time Start: 2016-03-08T07:50:00 * Date/Time End: 2016-03-08T07:50:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
4 datasets

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Datasets listed in this bundled publication

  1. Azevedo, A; Jiménez-Espejo, FJ; Bulian, F et al. (2023): Stable isotope ratios of Orbulina universa from IODP Site 361-U1476. https://doi.org/10.1594/PANGAEA.961175
  2. Azevedo, A; Jiménez-Espejo, FJ; Bulian, F et al. (2023): Amount of clay and sand from IODP Site 361-U1476. https://doi.org/10.1594/PANGAEA.961176
  3. Azevedo, A; Jiménez-Espejo, FJ; Bulian, F et al. (2023): Si/K and Ca/Ti elemental ratios of IODP Site 361-U1476. https://doi.org/10.1594/PANGAEA.961174
  4. Azevedo, A; Jiménez-Espejo, FJ; Bulian, F et al. (2023): Tie points of IODP Site 361-U1476. https://doi.org/10.1594/PANGAEA.961178