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Portilho-Ramos, Rodrigo Costa; Chiessi, Cristiano Mazur; Zhang, Yancheng; Mulitza, Stefan; Kucera, Michal; Siccha, Michael; Prange, Matthias; Paul, André (2017): Atlantic ITCZ planktonic foraminifera RN/Gg, MAT subsurface temperature, Ti/Ca and EDP-XRF calibrate scanning data. PANGAEA,, Supplement to: Portilho-Ramos, RC et al. (2017): Coupling of equatorial Atlantic surface stratification to glacial shifts in the tropical rainbelt. Scientific Reports, 7(1),

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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 at ca. 1°S (ca. 5° to the south of its modern annual mean position) during Heinrich Stadial 1. This supports a previous hypothesis, which postulates a southern hemisphere position of the oceanic ITCZ during climatic states with substantially reduced or absent cross-equatorial oceanic meridional heat transport.
Further details:
Zabel, Matthias (2013): XRF measurements on dry powder from sediment core GeoB16206-1. PANGAEA,
Zhang, Yancheng; Chiessi, Cristiano Mazur; Mulitza, Stefan; Zabel, Matthias; Trindade, Ricardo F; Hollanda, Maria Helena B M; Dantas, Elton L; Govin, Aline; Tiedemann, Ralf; Wefer, Gerold (2015): Reconstruction of the provenance and distribution of terrigenous sediments off NE South America over the last 30ka. PANGAEA,
Median Latitude: 0.699028 * Median Longitude: -46.060278 * South-bound Latitude: -1.579167 * West-bound Longitude: -61.243333 * North-bound Latitude: 12.090000 * East-bound Longitude: -43.023667
Date/Time Start: 1996-04-19T00:00:00 * Date/Time End: 2012-02-24T02:00:00
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