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| Equatorial western Atlantic Ocean circulation changes linked to the Heinrich events: deep-sea sediment evidence from the Amazon Fan Maslin, M. (1998). Equatorial western Atlantic Ocean circulation changes linked to the Heinrich events: deep-sea sediment evidence from the Amazon Fan, in: Cramp, A. et al. Geological evolution of ocean basins: results from the Ocean Drilling Program. Geological Society Special Publication, 131: pp. 111-127. https://dx.doi.org/10.1144/GSL.SP.1998.131.01.09
In: Cramp, A. et al. (1998). Geological evolution of ocean basins: Results from the Ocean Drilling Program. Geological Society Special Publication, 131. Geological Society: London. ISBN 1-86239-003-7. XI, 323 pp.
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719; e-ISSN 2041-4927, meer
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| Beschikbaar in | Auteur |
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Deglaciation Foraminifera Motion > Water motion > Circulation > Water circulation > Ocean circulation Sedimentation > Glacial sedimentation South America, Amazon R. Water > Deep water Amazon River [Marine Regions] |
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| Abstract |
The planktonic foraminiferal carbon isotope records of both Sites 932 and 933 show a distinct negative deviation during Termination I (13–15 calendar ka). We suggest this could have been caused by an increase in the sediment discharge of the Amazon River because of the deglaciation of the Andes and/or the release of significant quantities of gas hydrates as large parts of the Amazon Fan sediment column failed because of increased sea level. Positive δO deviations are also observed in the Site 932 records which seem to be coeval with the Heinrich events. It is suggested that the enhanced ice-rafting in the North Atlantic during the Heinrich events increased the latitudinal thermal gradient and thus the zonal component of the wind system. This reduced the northward penetration of the Inter-Tropical Convergence Zone, curtailing the cross-equatorial export of the North Brazilian Coastal Current (NBCC) and resulting in a permanent NBCC-reroflection. This increased the surface water salinity of the Amazon Fan and thus led to the observed positive δO deviations. |
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