A tropical perspective on ice-age cycles: Evidence for rapid climate transitions from East African paleolake records

这项申请建议对东非湖泊沉积物进行为期两年的调查，以评估与冰期动态有关的区域和全球气候变化。应用方面反映了环境科学、古气候学、古生物学、地质年代学和地球化学的科学学科。该科学计划的重点是对晚更新世(约135.000年)至早全新世(约10.000年)的层状沉积剖面进行高分辨率的沉积学和地球化学调查。基于硅藻传递函数、X射线显微扫描、时间序列分析和40Ar/39Ar定年，将建立反映年至千年时间尺度上环境快速变化的沉积模式。因此，该办法试图评估东非在冰期/间冰期过渡期间气候变化的时间和幅度，以及热带气候不稳定模式对冰期动力学的相对重要性。

This application proposes a two-year investigation on East African lake sediments in order to assess regional and global climate change related to ice-age dynamics. The application in terms reflects scientific disciplines of Environmental Sciences, Paleoclimatology, Paleontology, Geochronology and Geochemistry. The proposed scientific program focuses on high-resolution sedimentological and geochemical investigations of laminated sediment sections of Late Pleistocene (~135.000 yr) to Early Holocene (~10.000 yr) age. Based on diatom-transfer functions, X-ray microscanning, time-series analyses and 40Ar/39Ar-dating, sediments patterns reflecting rapid environmental change on annual to millennial timescales will be established. The approach therefore tries to evaluate the timing and amplitude of East African climate change during glacial/ interglacial transitions and the relative importance of tropical climate-instability patterns for ice-age dynamics.