Planktonic foraminifera, stable isotopes and Mg/Ca ratio from Cabo Frio (Brazil) sediment cores CF10-01B and CF10-09A ...
The Brazil Current (BC) is a relevant feature in the Atlantic Meridional Overturning Circulation (AMOC). Its behavior during slowdown or intense AMOC remains poorly known because of the lack of paleoceanographic records, especially for the Holocene. Here, we investigate changes in a western boundary...
| Main Authors: | , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2016
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.872152 https://doi.pangaea.de/10.1594/PANGAEA.872152 |
| Summary: | The Brazil Current (BC) is a relevant feature in the Atlantic Meridional Overturning Circulation (AMOC). Its behavior during slowdown or intense AMOC remains poorly known because of the lack of paleoceanographic records, especially for the Holocene. Here, we investigate changes in a western boundary upwelling system (Cabo Frio, off Southeastern Brazil) which are driven by variations in the BC and NE winds during the last 9 kyr. To assess the variability of the BC, we used d18O, Mg/Ca, and assemblages of planktonic foraminifera. Our results indicate five oceanographic phases during the last 9 kyr. During Phase I (from 9.0 to 7.0 cal kyr BP), the BC diverged offshore from the modern upwelling area because of the low sea level, increasing the influence of shelf waters and coastal upwelling plumes on foraminifera assemblages. Phase II (7.0-5.0 kyr BP) was marked by the approach of the internal front of the BC with low intensity and episodes of strong productivity that were linked primarily to the upwelling of ... : Supplement to: Lessa, Douglas Villela de Oliveira; Venancio, Igor Martins; Santos, Thiago Pereira dos; Belem, Andre L; Turcq, Bruno Jean; Sifeddine, Abdelfettah; Albuquerque, Ana Luiza Spadano (2016): Holocene oscillations of Southwest Atlantic shelf circulation based on planktonic foraminifera from an upwelling system (off Cabo Frio, Southeastern Brazil). The Holocene, 26(8), 1175-1187 ... |
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