Decadal- to orbital-scale climate variability in the Indo-Pacific Warm Pool during the past ca. 650,000 years

在此更新提案范围内提出的调查有助于ICDP资助的印度尼西亚“Towuti钻井项目”（TDP）。它们适用于2015年春季在位于印度太平洋暖池中心苏拉威西岛的图乌提湖的TDP站点2上钻探的整个约137米厚，大概有65万年历史的湖泊沉积物记录。对岩心组合物进行多学科年代地层、沉积学、地球化学和矿物学分析，以便(i)有助于沉积物记录的定年，（ii）破译图乌提湖的长期发展，以及它的形成和其他马里湖泊的河流输入的开始，（iii）重建过去~8万年中由降水控制的马哈拉诺河的河流流入，分辨率可达10年。（四）确定托乌提湖水位波动的幅度和潜在原因，（五）为了解托乌提混合和分层的可变性提供输入，（六）为重建该湖集水区的风化条件和土壤侵蚀作出贡献。这项研究应得到对地表沉积物样本调查的支持，这些样本是在钻探活动中回收的，为现代沉积过程提供了重要信息。因此，该项目有望在一定程度上提供独特的古环境和古气候数据，以补充其他国际项目对托乌提湖的研究，并为相关的生物项目提供重要的背景信息。

The investigations proposed within the scope of this renewal proposal contribute to the ICDP funded ´Towuti Drilling Project´ (TDP) in Indonesia. They apply to the entire, ~137 m thick and presumably 650,000 years old lake sediment record that was drilled in spring 2015 at TDP site 2 in Lake Towuti, which is located on Sulawesi Island in the center of the Indo-Pacific Warm Pool. Multidisciplinary chronostratigraphical, sedimentological, geochemical, and mineralogical analyses shall be carried out on the core composite, in order (i) to contribute to the dating of the sediment record, (ii) to decipher the long-term development of Lake Towuti, with its formation and the onset of riverine input from other Malili lakes, (iii) to reconstruct the precipitation-controlled riverine inflow from the Mahalano River during the past ~80,000 years with up to decadal resolution, (iv) to identify the dimension and potential reasons for lake-level fluctuations in Towuti, (v) to provide input to the understanding of the variability in mixing and stratification of Towuti, and (vi) to contribute to the reconstruction of weathering conditions and soil erosion in the lake´s catchment. This research shall be supported by the investigation of surface sediment samples, which were recovered during the drilling campaign and which provide important information on modern sedimentation processes. The project thus promises partly unique paleoenvironmental and paleoclimatological data that complement respective research by other international projects on Lake Towuti, and important background information for the associated biological projects.