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
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2023
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| _version_ | 1867168576912228352 |
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| author | 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 |
| author_facet | 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 |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_961179 |
| institution | PANGAEA |
| language | en |
| publishDate | 2023 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | 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 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 Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP 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. |
| title | 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 |
| topic | Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP |
| url | https://doi.org/10.1594/PANGAEA.961179 |