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

利用西藏湖泊系统陆地和水生生物标志物的复合特异性同位素信号重建亚洲季风

• 批准号: 180303936
• 负责人: Professor Dr. Gerd Gleixner
• 金额: --
• 依托单位: Abteilung Biogeochemische Prozesse
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/180303936?language=en
• 关键词: Reconstructionof; Asian; monsoon; using; compound

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.

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（13 C，18 O和D）重建单个湖泊系统的水文学，并使用14 C比较高原不同湖泊的事件时间。最新的化合物特定的D和14 C技术，使用生物标志物，克服了目前在古气候重建的局限性。一方面，利用水生生物标志物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，化合物特定的14 C值的陆地生物标志物将被用来建立一个年龄序列，不受可变水库效应的湖泊。该建议的重点是从Nam Co 08/01岩心重建，这是第一个可以追溯到约25 ka BP的岩心。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，8 k和新仙女木。其次，建立不受湖库效应影响的有效年龄深度模型。第三，我们将参与在坦格拉云科回收新岩芯的工作，并收集必要的植物、藻类、土壤和水样本，用于校准研究。 在对整个优先项目的联合研究活动进行重建的基础上，首次重建了青藏高原季风范围的发展。