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Tangunan, Deborah N; Berke, Melissa A; Cartagena-Sierra, Alejandra; Flores, José Abel; Grützner, Jens; Jiménez-Espejo, Francisco Jose; LeVay, Leah J; Baumann, Karl-Heinz; Romero, Oscar E; Saavedra-Pellitero, Mariem; Coenen, Jason J; Starr, Aidan; Hemming, Sidney R; Hall, Ian R; Expedition 361 Science Party (2020): Alkenone and coccolith abundance records at IODP Expedition 361 Site U1475 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.912467

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Abstract:
In the southern Indian Ocean, the position of the subtropical front – the boundary between colder, fresher waters to the south and warmer, saltier waters to the north – has a strong influence on the upper ocean hydrodynamics and biogeochemistry. Here we analyse a sedimentary record from the Agulhas Plateau, located close to the modern position of the subtropical front and use alkenones and coccolith assemblages to reconstruct oceanographic conditions over the past 300,000 years. We identify a strong glacial-interglacial variability in sea surface temperature and productivity associated with subtropical front migration over the Agulhas Plateau, as well as shorter-term high frequency variability aligned with variations in high latitude insolation. Alkenone and coccolith abundances, in combination with diatom and organic carbon records indicate high glacial export productivity. We conclude that the biological pump was more efficient and strengthened during glacial periods, which could partly account for the reported reduction in atmospheric carbon dioxide concentrations.
Keyword(s):
Agulhas Plateau; Coccolithophores; IODP Expedition 361; nannofossils; Site U1475
Supplement to:
Tangunan, Deborah N; Berke, Melissa A; Cartagena-Sierra, Alejandra; Flores, José Abel; Grützner, Jens; Jiménez-Espejo, Francisco Jose; LeVay, Leah J; Baumann, Karl-Heinz; Romero, Oscar E; Saavedra-Pellitero, Mariem; Coenen, Jason J; Starr, Aidan; Hemming, Sidney R; Hall, Ian R; Expedition 361 Science Party (2021): Strong glacial-interglacial variability in upper ocean hydrodynamics, biogeochemistry, and productivity in the southern Indian Ocean. Communications Earth & Environment, 2(80), https://doi.org/10.1038/s43247-021-00148-0
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Latitude: -41.427000 * Longitude: 25.261000
Date/Time Start: 2016-02-24T01:00:00 * Date/Time End: 2016-02-24T01:00:00
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. Tangunan, DN; Berke, MA; Cartagena-Sierra, A et al. (2020): Alkenones of IODP 361-U1475. https://doi.org/10.1594/PANGAEA.912459
  2. Tangunan, DN; Berke, MA; Cartagena-Sierra, A et al. (2020): Nannofossil absolute abundances of IODP Site 361-U1475. https://doi.org/10.1594/PANGAEA.912461
  3. Tangunan, DN; Berke, MA; Cartagena-Sierra, A et al. (2020): Nannofossil accumulation rates of IODP Site 361-U1475. https://doi.org/10.1594/PANGAEA.912464
  4. Tangunan, DN; Berke, MA; Cartagena-Sierra, A et al. (2020): Nannofossil relative abundances of IODP Site 361-U1475. https://doi.org/10.1594/PANGAEA.912465