Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

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): Planktonic foraminifera, stable isotopes and Mg/Ca ratio from Cabo Frio (Brazil) sediment cores CF10-01B and CF10-09A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.872152, Supplement to: Lessa, DVO et al. (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, https://doi.org/10.1177/0959683616638433

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2016 (exact date unknown) • DOI registered: 2017-03-16

RIS CitationBibTeX Citation ShareShow MapGoogle Earth

Abstract:
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 the South Atlantic Central Water (SACW) and/or Subpolar Shelf Waters (SPSWs) (cold). Phase III (5.0-3.5 kyr BP) was a transition, marking a large oceanographic and climatic change from the weakening of the AMOC. The internal front of the BC became warm and subsurface SACW upwelling was stronger. In Phase IV (3.5-2.5 kyr BP), the BC acquired its modern dynamics, but weak NE winds weakened the SACW's contribution to upwelling events. Finally, in Phase V (last 2.5 kyr BP), the NE winds reintensified, promoting frequent episodes of upwelling and intrusion by SPSWs during the Medieval Climate Anomaly.
Coverage:
Median Latitude: -23.300000 * Median Longitude: -41.705000 * South-bound Latitude: -23.600000 * West-bound Longitude: -41.740000 * North-bound Latitude: -23.200000 * East-bound Longitude: -41.600000
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Lessa, DVO; Venancio, IM; Santos, TP et al. (2016): Stable isotopes and Mg/Ca ratio from sediment core CF10-01B (Cabo Frio - Brazil). https://doi.org/10.1594/PANGAEA.872149
  2. Lessa, DVO; Venancio, IM; Santos, TP et al. (2016): (Table 2) Radiocarbon and calibrated ages of sediment core CF10-09A (Cabo Frio - Brazil). https://doi.org/10.1594/PANGAEA.872151
  3. Lessa, DVO; Venancio, IM; Santos, TP et al. (2016): Stable isotopes from sediment core CF10-09A (Cabo Frio - Brazil). https://doi.org/10.1594/PANGAEA.872150
  4. Lessa, DVO; Venancio, IM; Santos, TP et al. (2016): Planktonic foraminifera from sediment core CF10-09A (Cabo Frio - Brazil). https://doi.org/10.1594/PANGAEA.872148