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Exceptional Agulhas leakage prolonged interglacial warmth during MIS 11c in Europe ArchiMer
Koutsodendris, Andreas; Pross, Joerg; Zahn, Rainer.
The transport of warm and saline surface water from the Indo-Pacific Ocean into the South Atlantic (Agulhas leakage) influences the Atlantic Meridional Overturning Circulation (AMOC), which in turn exerts control on European climate. Paleoceanographic data document a remarkably strong Agulhas leakage at the end of marine isotope stage (MIS) 11c interglacial (similar to 400ka B.P.), which is one of the best orbital analogues for the Holocene. Here we assess the potential influence of this exceptional Agulhas leakage on North Atlantic climate based on a compilation of marine and terrestrial proxy records from the Iberian margin and continental Europe. We show that a similar to 5ka long warm period persisted across Europe beyond the MIS 11c climatic optimum....
Tipo: Text Palavras-chave: Agulhas leakage; Interhemispheric teleconnection; MIS 11c; Iberian margin; Central European climate.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00289/40056/39273.pdf
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Multicentennial Agulhas leakage variability and links to North Atlantic climate during the past 80,000 years ArchiMer
Dyez, Kelsey A.; Zahn, Rainer; Hall, Ian R..
New high-resolution sea surface temperature (SST) and sea surface salinity (SSS) estimates are presented from the Agulhas Bank slope in the Atlantic sector of the Agulhas Corridor using planktic foraminiferal (Globigerinoides ruber) O-18 and Mg/Ca-derived SST. By focusing on the last 80,000years, this is the first fine-scale Agulhas leakage record that overlaps in time with much of the Greenland ice core record of abrupt climate changes in the North Atlantic region. The multicentennial profiles indicate instances of warm SST and/or increased SSS coincident with Northern Hemisphere cool periods, followed by Northern Hemisphere warming. These periods of enhanced SST and SSS in the Agulhas Corridor occur at the last glacial termination (T1) and during North...
Tipo: Text Palavras-chave: Agulhas leakage; SST.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00289/40041/39390.pdf
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The role of the Agulhas in the Benguela Current System: A numerical modelling approach ArchiMer
Veitch, Jennifer A.; Penve, Pierrick.
A modelling approach is used to investigate the influence of the Agulhas on the southern Benguela system. Two climatological ROMS simulations are run that are identical except that in one of them the effect of the Agulhas is removed. Comparing their output allows for a clear indication of the role of the Agulhas on both the large-scale and shelf dynamics. About 15 Sv of the mean transport of the Benguela Current is shown to be contributed by Agulhas influx, with the most intense flow being associated with extreme turbulence and its meandering nature is a reflection of the passage of Agulhas Rings. The injection of warm water is particularly evident beyond the shelf-edge, producing a perennially intense cross-shelf density front that is enhanced during...
Tipo: Text Palavras-chave: Modeling; Benguela Current system; Agulhas leakage.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00383/49393/49826.pdf
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