First dating of the maximum glacier extent in the Taiwanese high mountain range in the Late Pleistocene

山地冰川的范围和平衡线高度（ELA）是反映冰期气候条件的敏感指标。来自不同亚洲山脉的数据表明，令人惊讶的是，在湿润季风东亚的最大冰川范围是不等时的全球气候末次冰期最大（LGM），并发生在约22 ka之前。台湾的孤立高山代表了一个理想的调查区域末次冰期冰川阶段在东亚的时间。最高海拔为3952米，目前未受冰川作用影响，但在晚更新世和全新世早期曾经历多次冰川作用。然而，最大冰川范围的冰川终点的位置以及最低ELA位置在整个台湾仍然未知，这是由于强大的冰后期侵蚀和各自的山谷段的难接近性。台湾北方雪山晚更新世最大河谷冰期的时间限制;台湾中部冰斗形成与冰砾搬运的时间限制（能高山）。由于在2015年和2016年的两次活动中已经完成了对可到达的终端冰川位置的巨石表面和冰川冰斗中的岩石棒的实地测绘和采样，该项目侧重于实验室分析，以确定14个样品的核素浓度，随后的年龄计算，数据可视化以及古气候解释。

The extent and equilibrium line altitudes (ELA) of mountain glaciers are used as sensitive indictors for the climate conditions during glacial periods. Data from various Asian mountains suggest surprisingly, that the maximum glacier extent in the humid monsoonal eastern Asia was non-isochronic with the worldwide climatic last glacial maximum (LGM) and took place earlier than about 22 ka.The isolated high mountains of Taiwan represent an ideal investigation area for the timing of last glacial glacier stages in East Asia. Reaching their highest elevation at 3952 m, they are unglaciated at present, but have been subject to multiple glaciations during the Late Pleistocene and early Holocene. However, the positions of the glacier termini of the maximum glacier extent as well as the lowest ELA position are still unknown in entire Taiwan, which is due to the strong postglacial erosion and the difficult accessibility of the respective valley sections.This project applies rock surface exposure dating with in situ produced cosmogenic nuclides 10Be and 26Al to get1. time constraints of the late Pleistocene maximum valley glaciation in northern Taiwan (Hsueh Shan) and2. time constraints of cirque formation and glacial boulder transport in central Taiwan (Nengao Shan).As field mapping and sampling of boulder surfaces at an accessible terminal glacial position and of rock bars in glacial cirques were already accomplished during two campaigns in 2015 and 2016, the project focuses on the laboratory analyses for the determination of the nuclide concentrations of 14 samples, the subsequent age calculation, the data visualisation as well as a palaeoclimatic interpretation.