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South Tropical Atlantic anti-phase response to Holocene Bond Events

Abstract : Records of the climatic impacts of the North Atlantic Bond cycles over the subtropical Southern Hemisphere re-main scarce, and their mechanism is a topic of active discussion. We present here an alkenone-based reconstruct-ed 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 ~ 0.8, ~ 1.7 and ~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 11 to 5 kyr B.P.) than in more recent time.
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Submitted on : Monday, December 15, 2014 - 10:48:52 AM
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Heitor Evangelista, Marcio Gurgel, Abdelfettah Sifeddine, Nivaor Rodolfo Rigozo, Mohammed Boussafir. South Tropical Atlantic anti-phase response to Holocene Bond Events. Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2014, 415, pp.21-27. ⟨10.1016/j.palaeo.2014.07.019⟩. ⟨insu-01093711⟩



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