Holocene climate dynamics and biogeochemical cycles in the Mediterranean Sea (HOBIMED)

我们建议研究的机制，导致冰消和全新世气候变化的海洋地球化学循环在地中海。我们集中在这个盆地，因为它是一个半封闭的海洋盆地非常大的幅度反应的物理循环制度的变化，水文平衡。过去的变化的地球化学过程和海洋生态系统的海洋记录在形式的有机丰富的腐泥发生在北方日照最大。为了了解高纬度和低纬度气候强迫地中海的敏感性，并衡量预期的全球变化的响应范围，我们将模拟地中海在最后一次冰消期和气候极端的全新世，包括过渡到腐泥S1，腐泥形成约8.2 kyr BP中断，并在全新世气候最佳的再通风。我们的双+概念将通过验证全球和区域地球系统模型实验与现有的和新的代理数据从东地中海实现。这些实验的目的是了解和量化不同的强迫机制和时间尺度的相对作用，这些机制和时间尺度涉及在地中海东部形成一种停滞和缺氧的深水状态。

We propose to study the mechanisms leading from deglacial and Holocene climate change to changed biogeochemical cycling in the Mediterranean Sea. We concentrate on this basin because it is a semi-enclosed ocean basin with very large amplitude reactions in the physical circulation regime to variations in the hydrological balance. The past variability of biogeochemical processes and marine ecosystems of this ocean is documented in the form of organic-rich sapropels that occurred at northern hemisphere insolation maxima. In order to understand the sensitivity of the Mediterranean Sea to high- and low-latitude climate forcing and to gauge the range of response to expected global change, we will model the Mediterranean Sea at times of the last deglaciation and climate extremes in the Holocene, including the transition into sapropel S1, the interruption of sapropel formation around 8.2 kyr BP, and reventilation during the Holocene Climate Optimum. Our Dual+ concept will be realized by the validation of global and regional Earth system model experiments with available and new proxy data from the eastern Mediterranean Sea. The aim of these experiments is to understand and quantify the relative role of the different forcing mechanisms and time scales involved in generating a state with stagnant and anoxic deepwater in the eastern Mediterranean Sea.