Atlantic ITCZ planktonic foraminifera RN/Gg, MAT subsurface temperature, Ti/Ca and EDP-XRF calibrate scanning data ...

• Main Authors: Portilho-Ramos, Rodrigo Costa, Chiessi, Cristiano Mazur, Zhang, Yancheng, Mulitza, Stefan, Kucera, Michal, Siccha, Michael, Prange, Matthias, Paul, André
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2017
• Subjects: Center for Marine Environmental Sciences MARUM; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.875299; https://doi.pangaea.de/10.1594/PANGAEA.875299

The modern state of the Atlantic meridional overturning circulation promotes a northerly maximum of tropical rainfall associated with the Intertropical Convergence Zone (ITCZ). For continental regions, abrupt millennial-scale meridional shifts of this rainbelt are well documented, but the behavior of its oceanic counterpart is unclear due the lack of a robust proxy and high temporal resolution records. Here we show that the Atlantic ITCZ leaves a distinct signature in planktonic foraminifera assemblages. We applied this proxy to investigate the history of the Atlantic ITCZ for the last 30,000 years based on two high temporal resolution records from the western Atlantic Ocean. Our reconstruction indicates that the shallowest mixed layer associated with the Atlantic ITCZ unambiguously shifted meridionally in response to changes in the strength of the Atlantic meridional overturning with a southward displacement during Heinrich Stadials 2-1 and the Younger Dryas. We conclude that the Atlantic ITCZ was located ... : Supplement to: Portilho-Ramos, Rodrigo Costa; Chiessi, Cristiano Mazur; Zhang, Yancheng; Mulitza, Stefan; Kucera, Michal; Siccha, Michael; Prange, Matthias; Paul, André (2017): Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt. Scientific Reports, 7(1) ...