The ventilation and circulation of the southern Indian Ocean on glacial / interglacial timescales

通过这个项目，我们希望提高我们对冰川/间冰期时间尺度上的全球碳循环的认识。为了实现这一目标，至关重要的是要了解南大洋在释放和吸收温室气体方面的作用。由于南印度洋目前在古海洋学重建中基本上代表性不足，因此本项目的目的是重建该海洋对大气CO2模式的贡献。因此，我们计划结合联合收割机稳定（D13 C）和放射性（D14 C）同位素重建地球系统模拟冰川淡水通量的沉积物芯深度样带的Kerguelen群岛和康拉德上升。这些分析将提供一个详细的洞察到冰川/间冰期时间尺度上的印度洋水团通风的历史。最终，我们希望联合收割机该项目的研究结果与其他水团通风研究（例如Skinner等人，2010; Sarnthein等人，2013; Ronge等人，2016）。这些研究结果，结合以前的研究，从大西洋和太平洋将首次允许全面环极重建二氧化碳富集深水在末次冰期，整个冰川消退的通风和大气中的二氧化碳水平的贡献。

With this project, we want to enhance our knowledge of the global carbon cycle on glacial/interglacial time-scales. To achieve this objective, it is of crucial importance to understand the role of the Southern Ocean on the release and uptake of greenhouse gases. As the southern Indian Ocean is currently fundamentally underrepresented in paleoceanographic reconstructions, it is the aim of this project to reconstruct the contribution of this ocean to the atmospheric pattern of CO2. Therefore, we plan to combine stable (d13C) and radiogenic (D14C) isotope reconstructions with Earth System Modelling of glacial freshwater fluxes on a sediment core depth transect of the Kerguelen Islands and the Conrad Rise. These analyses will provide a detailed insight into the history of water mass ventilation in the Indian Ocean on glacial/interglacial timescales. Ultimately, we want to combine the findings of this project with other water mass ventilation studies (e.g. Skinner et al., 2010; Sarnthein et al., 2013; Ronge et al., 2016). These findings, in combination with previous studies from the Atlantic and Pacific Oceans will for the first time allow a comprehensive circumpolar reconstruction of CO2-enriched deep-water during the last glacial, the ventilation throughout the deglaciation and the contribution to the atmospheric CO2-level.