Buchumschlag

Strong glacial-interglacial variability in upper ocean hydrodynamics, biogeochemistry, and productivity in the southern Indian Ocean

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...

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Hauptverfasser: Tangunan, Deborah N. (VerfasserIn) , Berke, Melissa A. (VerfasserIn) , Cartagena-Sierra, Alejandra (VerfasserIn) , Flores, José Abel (VerfasserIn) , Gruetzner, Jens (VerfasserIn) , Jiménez-Espejo, Francisco (VerfasserIn) , LeVay, Leah J. (VerfasserIn) , Baumann, Karl-Heinz (VerfasserIn) , Romero, Oscar (VerfasserIn) , Saavedra-Pellitero, Mariem (VerfasserIn) , Coenen, Jason J. (VerfasserIn) , Starr, Aidan (VerfasserIn) , Hemming, Sidney R. (VerfasserIn) , Hall, Ian R. (VerfasserIn) , Koutsodendris, Andreas (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 05 May 2021
In: Communications earth & environment
Year: 2021, Jahrgang: 2, Pages: 1-13
ISSN:2662-4435
DOI:10.1038/s43247-021-00148-0
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/s43247-021-00148-0
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s43247-021-00148-0
Volltext
Verfasserangaben:Deborah Tangunan, Melissa A. Berke, Alejandra Cartagena-Sierra, José Abel Flores, Jens Gruetzner, Francisco Jiménez-Espejo, Leah J. LeVay, Karl-Heinz Baumann, Oscar Romero, Mariem Saavedra-Pellitero, Jason J. Coenen, Aidan Starr, Sidney R. Hemming, Ian R. Hall & Expedition 361 science party
Beschreibung
Zusammenfassung: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.
Beschreibung:Expedition 361 science party: Ian R. Hall, Sidney R. Hemming, Leah J. LeVay, Stephen Barker, Melissa A. Berke, Luna Brentegani, Thibaut Caley, Alejandra Cartagena-Sierra , Christopher D. Charles, Jason J. Coenen , Julien G. Crespin, Allison M. Franzese, Jens Gruetzner , Xibin Han, Sophia K.V. Hines, Francisco J. Jimenez Espejo, Janna Just, Andreas Koutsodendris, Kaoru Kubota, Nambiyathodi Lathika, Richard D. Norris, Thiago Pereira dos Santos, Rebecca S. Robinson, John M. Rolison, Margit H. Simon, Deborah Tangunan, Jeroen J.L. van der Lubbe, Masako Yamane & Hucai Zhang
Gesehen am 13.07.2021
Beschreibung:Online Resource
ISSN:2662-4435
DOI:10.1038/s43247-021-00148-0

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