Expedition 361 summary

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doi: 10.14379/iodp.proc.361.102.2017
Author(s): Hall, Ian R.; Hemming, Sidney R.; LeVay, Leah J.; Barker, Stephen R.; Berke, Melissa A.; Brentegani, Luna; Caley, Thibaut; Cartagena-Sierra, Alejandra; Charles, Christopher D.; Coenen, Jason J.; Crespin, Julien G.; Franzese, Allison M.; Gruetzner, Jens; Han Xibin; Hines, Sophia K. V.; Jimenez Espejo, Francisco J.; Just, Janna; Koutsodendris, Andreas; Kubota, Kaoru; Lathika, Nambiyathodi; Norris, Richard D.; Pereira dos Santos, Thiago; Robinson, Rebecca; Rolison, John M.; Simon, Margit H.; Tangunan, Deborah; van der Lubbe, Jeroen J. L.; Yamane, Masako; Zhang Hucai
International Ocean Discovery Program, Expedition 361 Scientists, College Station, TX
Author Affiliation(s): Primary:
Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom
Other:
Lamont-Doherty Earth Observatory, United States
Texas A&M University, United States
University of Notre Dame, United States
University of Technology Queensland, Australia
University of Bordeaux, France
Volume Title: Proceedings of the International Ocean Discovery Program; South African climates (Agulhas LGM density profile); Expedition 361 of the riserless drilling platform, Port Louis, Mauritius, to Cape Town, South Africa; Sites U1474-U1479, 30 January-31 March 2016
Volume Author(s): Hall, Ian R.; Hemming, Sidney R.; LeVay, Leah J.; Barker, Stephen R.; Berke, Melissa A.; Brentegani, Luna; Caley, Thibaut; Cartagena-Sierra, Alejandra; Charles, Christopher D.; Coenen, Jason J.; Crespin, Julien G.; Franzese, Allison M.; Gruetzner, Jens; Han Xibin; Hines, Sophia K. V.; Jimenez Espejo, Francisco J.; Just, Janna; Koutsodendris, Andreas; Kubota, Kaoru; Lathika, Nambiyathodi; Norris, Richard D.; Pereira dos Santos, Thiago; Robinson, Rebecca; Rolison, John M.; Simon, Margit H.; Tangunan, Deborah; van der Lubbe, Jeroen J. L.; Yamane, Masako; Zhang Hucai
Source: Proceedings of the International Ocean Discovery Program; South African climates (Agulhas LGM density profile); Expedition 361 of the riserless drilling platform, Port Louis, Mauritius, to Cape Town, South Africa; Sites U1474-U1479, 30 January-31 March 2016, Ian R. Hall, Sidney R. Hemming, Leah J. LeVay, Stephen R. 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, Han Xibin, Sophia K. V. Hines, Francisco J. Jimenez Espejo, Janna Just, Andreas Koutsodendris, Kaoru Kubota, Nambiyathodi Lathika, Richard D. Norris, Thiago Pereira dos Santos, Rebecca Robinson, John M. Rolison, Margit H. Simon, Deborah Tangunan, Jeroen J. L. van der Lubbe, Masako Yamane and Zhang Hucai; International Ocean Discovery Program, Expedition 361 Scientists, College Station, TX. Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.361, 33p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 CODEN: IDSDA6
Note: In English. 179 refs.; illus., incl. 1 table, sketch map
Summary: International Ocean Discovery Program Expedition 361 drilled six sites on the southeast African margin (southwest Indian Ocean) and in the Indian-Atlantic Ocean gateway, from 30 January to 31 March 2016. In total, 5175 m of core was recovered, with an average recovery of 102%, during 29.7 days of on-site operations. The sites, situated in the Mozambique Channel at locations directly influenced by discharge from the Zambezi and Limpopo River catchments, the Natal Valley, the Agulhas Plateau, and Cape Basin, were targeted to reconstruct the history of the greater Agulhas Current system over the past ∼5 My. The Agulhas Current is the strongest western boundary current in the Southern Hemisphere, transporting some 70 Sv of warm, saline surface water from the tropical Indian Ocean along the East African margin to the tip of Africa. Exchanges of heat and moisture with the atmosphere influence southern African climates, including individual weather systems such as extratropical cyclone formation in the region and rainfall patterns. Recent ocean model and paleoceanographic data further point at a potential role of the Agulhas Current in controlling the strength and mode of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Pleistocene. Spillage of saline Agulhas water into the South Atlantic stimulates buoyancy anomalies that may influence basin-wide AMOC, with implications for convective activity in the North Atlantic and global climate change. The main objectives of the expedition were to establish the role of the Agulhas Current in climatic changes during the Pliocene-Pleistocene, specifically to document the dynamics of the Indian-Atlantic Ocean gateway circulation during this time, to examine the connection of the Agulhas leakage and AMOC, and to address the influence of the Agulhas Current on African terrestrial climates and coincidences with human evolution. Additionally, the expedition set out to fulfill the needs of Ancillary Project Letter number 845, consisting of high-resolution interstitial water sampling to help constrain the temperature and salinity profiles of the ocean during the Last Glacial Maximum. The expedition made major strides toward fulfilling each of these objectives. The recovered sequences allowed generation of complete spliced stratigraphic sections that range from 0 to between ∼0.13 and 7 Ma. This sediment will provide decadal- to millennial-scale climatic records that will allow answering the paleoceanographic and paleoclimatic questions set out in the drilling proposal.
Year of Publication: 2017
Research Program: IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Agulhas Current; Algae; Atlantic Meridional Overturning Circulation; Atlantic Ocean; Biostratigraphy; Cenozoic; Cores; Correlation; Diatoms; Expedition 361; Foraminifera; Geochemistry; Indian Ocean; International Ocean Discovery Program; Invertebrata; Lithostratigraphy; Magnetostratigraphy; Marine sediments; Microfossils; Miocene; Mozambique Channel; Nannofossils; Neogene; Ocean circulation; Paleo-oceanography; Paleoclimatology; Physical properties; Plantae; Protista; Quaternary; Sediments; South Atlantic; Southeast Atlantic; Tertiary; West Indian Ocean
Coordinates: S412545 S154900 E0414610 E0172400
Record ID: 2017087780
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.
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