Published March 9, 2021 | Version v1
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A 125-ka record of South American precipitation and the role of the bipolar 2 seesaw during Dansgaard-Oeschger events

  • 1. Academy of Sciences, Humanities and Literature, Mainz, c/o GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
  • 2. Leibniz-Laboratory for Radiometric Dating and Isotope Research, Kiel University, Kiel, Germany
  • 3. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 4. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research c/o GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany

Description

X-ray fluorescence data (Ti/Ca and Zr/Rb ratios) were obtained using the Aavatech XRF Core Scanner at University Kiel in two runs (10 kv, 750 mA, 10 seconds and 30 kv, 2000 mA, 20 seconds). Elemental intensities were measured every 1 cm between 0-18.83 m and 0.5 cm between 18.84-22 m (revised depth). The carbonate content was calculated as CaCO3=8.33x(TC-TOC) using LECO analyzer. Samples were taken at 20 cm throughout the upper ~10.4 m of the core and at 5 cm between 10.4-22 m (revised depth). Stable isotope ratios in planktic foraminifera were measured every 20 cm for the upper 0-18.5 m and every 10 cm between 18.5-22 cm (revised depth). Note that the original core depth scale in core MD99-2198 was modified by excluding two intervals (10.06-10.24 m and 13.78-14.30 m), representing episodes where the core was ripped apart, as could be concluded on the basis of large increases in porosity.

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