Title
South Tropical Atlantic anti-phase response to Holocene Bond Events
Date Issued
01 December 2014
Access level
open access
Resource Type
journal article
Author(s)
Universidade Federal Fluminense
Publisher(s)
Elsevier
Abstract
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 ~. 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.
Start page
21
End page
27
Volume
415
Language
English
OCDE Knowledge area
Oceanografía, Hidrología, Recursos hídricos
Subjects
Scopus EID
2-s2.0-84910063220
Source
Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN of the container
00310182
Sources of information:
Directorio de Producción Científica
Scopus