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| Barker, Stephen; Diz, Paula. |
| We present planktonic foraminiferal fauna and isotope records from the SE Atlantic that highlight the nature of millennial-scale variability over the last 100 kyr. We derive a hypothesis-driven age model for our records based on the empirical link between variations in Greenland temperature, ocean circulation, and carbonate preservation in the deep SE Atlantic. Our results extend earlier findings of an antiphase (seesaw) relationship between north and south for the largest abrupt events of Marine Isotope Stage (MIS) 3-2 and the last deglaciation. In particular, we find that Heinrich Stadials were paralleled by inferred southward shifts of the thermal Subtropical Front. These were followed by pronounced rebounds of the front with the return to interstadial... |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40129/38753.pdf |
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| Mcneill, Lisa C.; Shillington, Donna J.; Carter, Gareth D. O.; Everest, Jeremy D.; Gawthorpe, Robert L.; Miller, Clint; Phillips, Marcie P.; Collier, Richard E. Ll; Cvetkoska, Aleksandra; De Gelder, Gino; Diz, Paula; Mai-linh Doan,; Ford, Mary; Geraga, Maria; Gillespie, Jack; Hemelsdael, Romain; Herrero-bervera, Emilio; Ismaiel, Mohammad; Janikian, Liliane; Kouli, Katerina; Le Ber, Erwan; Li, Shunli; Maffione, Marco; Mahoney, Carol; Machlus, Malka L.; Michas, Georgios; Nixon, Casey W.; Oflaz, Sabire Asli; Omale, Abah P.; Panagiotopoulos, Kostas; Pechlivanidou, Sofia; Sauer, Simone; Seguin, Joana; Sergiou, Spyros; Zakharova, Natalia, V; Green, Sophie. |
| Young rifts are shaped by combined tectonic and surface processes and climate, yet few records exist to evaluate the interplay of these processes over an extended period of early rift-basin development. Here, we present the longest and highest resolution record of sediment flux and paleoenvironmental changes when a young rift connects to the global oceans. New results from International Ocean Discovery Program (IODP) Expedition 381 in the Corinth Rift show 10s-100s of kyr cyclic variations in basin paleoenvironment as eustatic sea level fluctuated with respect to sills bounding this semi-isolated basin, and reveal substantial corresponding changes in the volume and character of sediment delivered into the rift. During interglacials, when the basin was... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00485/59635/62661.pdf |
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| Molyneux, Elizabeth G.; Hall, Ian R.; Zahn, Rainer; Diz, Paula. |
| Sortable silt mean grain sizes together with oxygen and carbon isotopic data produced on the benthic foraminiferal species Fontbotia wuellerstorfi are used to construct high-resolution records of near-bottom flow vigour and deep water ventilation at a core site MD02-2589 located at 2660 m water depth on the southern Agulhas Plateau. The results suggest that during glacial periods ( marine oxygen isotope stages 2 and 6, MIS 2 and MIS 6, respectively), there was a persistent contribution of a well-ventilated water mass within the Atlantic to Indian oceanic gateway with a delta(13)C signature similar to present-day Northern Component Water (NCW), e. g., North Atlantic Deep Water (NADW). The records of chemical ventilation and near-bottom flow vigor reflect... |
| Tipo: Text |
Palavras-chave: Benthic isotopes; Sortable silt mean grain size; North Atlantic Deep Water. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00233/34459/32867.pdf |
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