Quantification of Past Ocean Dynamics.

大西洋经向翻转环流（AMOC）通过调节全球盐、热、营养物质和碳的运输和储存，在地球气候系统中扮演着重要角色。为了对地球气候对扰动的反应提供现实的预测，我们需要对海洋环流有一个机械的了解。现代科学一直在回顾过去，以评估海洋在不同边界条件下的行为。然而，对物理和生物地球化学运输机制的不完整定量理解仍然阻碍了模式可靠地模拟过去和未来的气候变率。本文采用运动环流代理231Pa/230Th，以空前的时间分辨率对全新世间冰期AMOC进行了定量研究。全新世已成为（古）气候学研究的焦点，因为它的边界条件本质上最适合研究未来的演变和估计阈值行为。通过将模式输出与新数据集进行比较，将评估AMOC的稳定性和变率，这是气候模式高度需要的参数。

The Atlantic Meridional Overturning Circulation (AMOC) represents a major player in the climate system of our planet by modulating the global transport and storage of salt, heat, nutrients and carbon. In order to provide realistic predictions about the response of Earth’s climate to perturbations, we need a mechanistic understanding of ocean circulation. Modern science has been looking back to the past to assess the behaviour of the oceans under varying boundary conditions. However, incomplete quantitative understanding of the physical and biogeochemical transport mechanisms still hinders models to reliably simulate past and future climate variability. This proposal focuses on quantitatively investigating the AMOC during the ongoing Interglacial, the Holocene (the last ~11,000 years), by applying the kinematic circulation proxy 231Pa/230Th in unprecedented temporal resolution. The Holocene has moved into the focus of (paleo)climatologic research since its boundary conditions are inherently best suitable to examine future evolutions and to estimate threshold behaviours. By comparing model-outputs to the new data sets stability and variability of the AMOC will be assessed, which are highly demanded parameters for climate models.