Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation
Mulitza, Stefan; Chiessi, Cristiano M.; Schefuß, Enno; Lippold, Jörg; Wichmann, David; Antz, Benny; Mackensen, Andreas; Paul, André; Prange, Matthias; Rehfeld, Kira; Werner, Martin; Bickert, Torsten; Frank, Norbert; Kuhnert, Henning; Lynch-Stieglitz, Jean; Portilho-Ramos, Rodrigo C.; Sawakuchi, André O.; Schulz, Michael; Schwenk, Tilmann; Tiedemann, Ralf; Vahlenkamp, Maximilian; Zhang, Yancheng
(2017) Paleoceanography, volume 32, issue 6, pp. 622 - 633
(Article)
Abstract
Changes in heat transport associated with fluctuations in the strength of the Atlantic meridional overturning circulation (AMOC) are widely considered to affect the position of the Intertropical Convergence Zone (ITCZ), but the temporal immediacy of this teleconnection has to date not been resolved. Based on a high-resolution marine sediment sequence
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over the last deglaciation, we provide evidence for a synchronous and near-linear link between changes in the Atlantic interhemispheric sea surface temperature difference and continental precipitation over northeast Brazil. The tight coupling between AMOC strength, sea surface temperature difference, and precipitation changes over northeast Brazil unambiguously points to a rapid and proportional adjustment of the ITCZ location to past changes in the Atlantic meridional heat transport.
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Keywords: Atlantic meridional overturning circulation, continental precipitation, deglaciation, Intertropical Convergence Zone, northeast Brazil, sea surface temperature, Oceanography, Palaeontology
ISSN: 0883-8305
Publisher: American Geophysical Union
(Peer reviewed)
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