Reconstruction of Asian monsoon using compound-specific isotope signals of terrestrial an aquastic biomarkers in Tibetan lake systems "Western lakes"

该项目是重建青藏高原晚第四纪季风动力学的联合多代理研究活动的一部分。它使用稳定同位素(13C、15N、18O和D)来重建各个湖泊系统的水文，并使用14C来比较高原上不同湖泊中事件的时间。一方面，利用水生生物标志物和陆地生物标志物的δD值分别重建季风强度和气候。另一方面，将使用陆地生物标志物化合物特有的14C值来建立不受湖泊可变储集层效应影响的年龄序列。这项建议的重点是(I)重建作为联合研究计划第二和第三研究地点的Tangra Yumco和Taro Co，以及(Ii)综合我们在整个青藏高原的联合成果。具体来说，我们将与Tangra Yumco和Taro Co的现有短岩心合作。我们将参与Tangra Yumco长岩心的回收工作，并收集必要的植物、藻类、土壤和水样本进行校准研究。最终建立不受湖相储层效应影响的有效年龄深度模型，并对长岩心进行分析。根据首次联合研究活动的所有重建，将重建青藏高原上季风范围的发展。

This project is part of a joint multi-proxy research activity reconstructing the late Quaternary Monsoon dynamics on the Tibetan plateau. It uses stable isotopes (13C, 15N, 18O and D) to reconstruct the hydrology of individual lake systems and 14C to compare the timing of events in different lakes on the plateau. On the one hand δD values of aquatic and terrestrial biomarkers are applied to reconstruct monsoon intensity and climate, respectively. On the other hand compound-specific 14C values of terrestrial biomarkers will be used to establish an age sequence that is not affected by the variable reservoir effect of the lakes. Focal points of this proposal are (I) reconstructions from the Tangra Yumco and the Taro Co, which are the second and third study site of the joint research plan and (II) synthesis of our joint results over the whole Tibetan Plateau. In detail, we will work with existing short cores of the Tangra Yumco and Taro Co. We will participate in the retrieval of a long core at Tangra Yumco and collect necessary samples of plants, algae, soil and water for calibration studies. We will finally establish a valid age depth model that is not affected by the lake reservoir effect and analyse the long core. Based on all reconstructions of the joint research activity for the first time the development of the monsoon extent over the Tibetan plateau will be reconstructed.