Glacial ice-sheet dynamics and retreat deduced from southeastern Weddell Sea sediment (LAMINAE)

作为研究包RIDDLE（在不同尺度上重建冰盖动力学）的一部分，LAMINAE项目的主要目标是提供对南极洲威德尔海东南部冰川冰盖动力学的详细了解。十个现有的沉积物网站，保存至少五千年的纹层序列在末次盛冰期（LGM）将进行研究与多代理的方法。首先，南极冰盖在末次盛冰期结束时的最后退缩将用14 C来定年。这些结果将有助于限制西南极冰盖和东南极冰盖（包括潜在的冰架）最初海平面上升的时间。其次，我们将建立浮动年表的新方法，纹层识别和纹层计数。因此，将有可能以前所未有的分辨率研究冰川冰盖动态，包括十年至百年尺度的太阳周期在气候变化中的作用，以及在穿透海洋同位素阶段3的地点探测南极同位素极大值。第三，结合绝对和浮动年表，我们将定义标志层的核心部分，丰富的生物扰动，冰筏碎片，或灰层，网站之间的相关性和EDML冰芯。这将把我们的结果放在一个更大的尺度上，并允许大气和海洋对气候变化的反应同步。

As part of research bundle RIDDLE (Reconstructing ice-sheet dynamics on different scales), the key goal of project LAMINAE is to provide detailed insight into glacial ice sheet dynamics in the southeastern Weddell Sea section of Antarctica. Ten existing sediment sites that preserved at least five millennia of varved sequences during the last glacial maximum (LGM) will be studied with a multi-proxy approach. First, the final retreat of the Antarctic Ice Sheet at the end of the LGM will be dated with 14C. The results will help to confine the timing of the initial sea-level rise for both the West and East Antarctic Ice Sheets, including potential asynchronies. Second, we will establish floating chronologies from new methods for laminae recognition and varve counting. Thereby, it will be possible to study glacial ice sheet dynamics at unprecedented resolution, including the role of decadal-centennial scale solar cycles in climate change, and the detection of Antarctic Isotopic Maxima in sites penetrating Marine Isotopic Stage 3. Third, with the combination of absolute and floating chronologies, we will define marker horizons in core sections that are rich in bioturbation, ice-rafted debris, or ash layers, for correlation between the sites and to the EDML ice core. This will put our results into a larger-scale perspective and allow for synchronization of the atmospheric and oceanic response to climate change.