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Silicic Acid Utilization Efficiency during Termination II in the Southern Ocean

Explore the significant changes in d30Si across Termination OIS 6, OIS 5e, and Termination II, focusing on oceanic d30Si modeling, seasonal fractionation, biogenic opal export, and gyre utilization. Wischmeyer et al. '03 on global deep-water distribution and "conveyor" contrasts.

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Silicic Acid Utilization Efficiency during Termination II in the Southern Ocean

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  1. Silicic acid utilization efficiency • Paleo-proxy: Termination II, Southern Ocean • Large change in d30Si across Termination OIS 6 OIS 5e Termination II

  2. Modeling oceanic d30Si • Seasonal fractionation • Export of biogenic opal • High utilization in gyres • But no deep-water signals expected Wischmeyer et al.`03

  3. Global Deep-Water Distribution • Strong [Si] and isotopic contrasts Along “conveyor”

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