Evangelista H., Gurgel M., Sifeddine Abdelfettah, Rigozo N. R., Boussafir M. (2014). South Tropical Atlantic anti-phase response to Holocene bond events. In :
Sifeddine Abdelfettah (ed.), Meyers P.A. (ed.), Valdés J. (ed.), Leite Días da Silva P. (ed.). Continental and coastal marine records of centennial to millennial changes in South American climate since the last glacial maximum. Palaeogeography Palaeoclimatology Palaeoecology, 415 (no spécial), p. 21-27. ISSN 0031-0182.
Titre du document
South Tropical Atlantic anti-phase response to Holocene bond events
Evangelista H., Gurgel M., Sifeddine Abdelfettah, Rigozo N. R., Boussafir M.
In
Sifeddine Abdelfettah (ed.), Meyers P.A. (ed.), Valdés J. (ed.), Leite Días da Silva P. (ed.), Continental and coastal marine records of centennial to millennial changes in South American climate since the last glacial maximum
Source
Palaeogeography Palaeoclimatology Palaeoecology, 2014,
415 (no spécial), p. 21-27 ISSN 0031-0182
Records of the climatic impacts of the North Atlantic Bond cycles over the subtropical Southern Hemisphere remain scarce, and their mechanism is a topic of active discussion. We present here an alkenone-based reconstructed sea surface temperature (SST) of a sediment core retrieved from the Brazilian Southwestern Tropical Atlantic (SWTA), Rio de Janeiro, together with a sediment SST record from the Cariaco Basin. The sediment cores span the period 2,100 B.P. - 11,100 B.P. Morlet-wavelet analysis detected marked periodic signals of similar to 0.8, similar to 1.7 and similar to 2.2 kyr, very similar and with comparable phases to the hematite-stained-grain time series from the Northern North Atlantic in which the cyclic pattern was recognized as Bond cycles. Our result corroborates the modeled surface ocean anti-phase thermal relation between the North and the South Atlantic. We attribute this behavior to the slowing of the Atlantic Meridional Overturning Circulation. The relative SST warming at Rio de Janeiro and the relative cooling at Cariaco were comparatively more pronounced during the early Holocene (from II to 5 kyr B.P.) than in more recent time.
