Reconstructionof Asian monsoon using compound-specific isotope signals of terrestrial and aquativ biomarkers in Tibetan lake systems

该项目是青藏高原晚第四纪季风动力学重建联合多代理研究活动的一部分。它使用稳定同位素（13C， 18O和D）来重建单个湖泊系统的水文，并使用14C来比较高原上不同湖泊事件的时间。利用生物标志物的最新化合物特异性D和14C技术克服了目前古气候重建的局限性。一方面，利用水生和陆生生物标志物的δD值分别重建季风强度和气候。另一方面，陆地生物标志物的化合物特异性14C值将用于建立不受湖泊可变储层效应影响的年龄序列。本研究的重点是南错08/01岩心的重建，这是第一个岩心，可追溯到约25 ka BP。我们将首先关注序列中最古老和未知的部分，然后是已知的事件，如4k， 8k和新仙女木。其次，建立不受湖泊水库效应影响的有效年龄深度模型。第三，我们将参与在Tangra Yumco的新核心的检索，并收集必要的植物，藻类，土壤和水样本进行校准研究。基于整个优先项目联合研究活动的所有重建结果，首次可以重建青藏高原季风区的发展。

This project is part of a joint multiproxy research activity reconstructing the late Quaternary Monsoon dynamics on the Tibetan plateau. It uses stable isotopes (13C, 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. Latest compound-specific D and 14C technology using biomarkers are applied overcoming current limitations in palaeoclimate reconstruction. 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 reconstructions from the core Nam Co 08/01, which is the first core dates back to about 25 ka BP. We will firstly focus on the oldest and unknown part of the sequence followed by known events like 4k, 8k and the Younger Dryas. Secondly we will establish a valid age depth model that is not affected by the lake reservoir effect. Thirdly, we will participate in the retrieval of the new core at Tangra Yumco and collect necessary samples of plants, algae, soil and water for calibration studies. Based on all reconstructions of the joint research activity over the whole priority program for the first time the development of the monsoon extent over the Tibetan plateau can be reconstructed.