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| Purcell, Conor. |
| The warm and cold water route ocean gateways are important oceanographic locations with respect to global climate. By the advection of salinity anomalies to the North Atlantic, changes at these ocean gateways are suggested to affect the strength and geometry of the Atlantic Meridional Overturning Circulation (AMOC). Adjustments of the AMOC can play a crucial role in the Earth‘s climate, and are suggested to be related to climate changes of the Late Pleistocene. However, little is known about the role of the warm and cold water route gateways on past glacial-interglacial and millennial time scales. This thesis documents a study which utilises Earth system modelling, combined with analyses of climate proxy data, to investigate the behaviour of these ocean... |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00499/61037/64444.pdf |
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| Marino, Gianluca; Zahn, Rainer; Ziegler, Martin; Purcell, Conor; Knorr, Gregor; Hall, Ian R.; Ziveri, Patrizia; Elderfield, Henry. |
| An ensemble of new, high-resolution records of surface ocean hydrography from the Indian-Atlantic oceanic gateway, south of Africa, demonstrates recurrent and high-amplitude salinity oscillations in the Agulhas Leakage area during the penultimate glacial-interglacial cycle. A series of millennial-scale salinification events, indicating strengthened salt leakage into the South Atlantic, appear to correlate with abrupt changes in the North Atlantic climate and Atlantic Meridional Overturning Circulation (AMOC). This interhemispheric coupling, which plausibly involved changes in the Hadley Cell and midlatitude westerlies that impacted the interocean transport at the tip of Africa, suggests that the Agulhas Leakage acted as a source of negative buoyancy for... |
| Tipo: Text |
Palavras-chave: Agulhas Leakage; Abrupt climate change; Millennial-scale variability; AMOC; Bipolar seesaw; Southern Hemisphere atmospheric circulation. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00264/37493/35791.pdf |
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