Forcing Mechanisms of Tropical Continental Climate: Deciphering a 100 kyr Record of Limnological Change from Lake Tanganyika Sediment Cores

该奖项支持一个项目，以编制详细的地质年代学，并对东非坦噶尼喀湖一个孤立的、沉积速度慢的盆地间海脊的六个沉积岩芯进行独特的勘测古矿物学代理分析。初步工作表明，这个地区的沉积速度比非洲裂谷湖泊中的任何其他地点都慢一个数量级，这些核心中最古老的沉积物可能有10万年的历史。赤道非洲内陆没有类似的高质量、高分辨率、持续时间长的古气候记录。科学家们将研究坦噶尼喀湖古海平面记录中存在10基尔“双”岁差周期的证据，以及北半球冰量波动的节奏在多大程度上主导着坦噶尼喀湖系统。该项目是在理想方案(东非湖泊国际十年)的赞助下进行的。

This award supports a project to develop a detailed geochronology and to conduct reconnaissance paleolimnological proxy analyses on a unique suite of six sediment cores from an isolated, slow-sedimentation rate, interbasinal ridge in Lake Tanganyika, East Africa. Initial work suggests that sedimentation rates at this locality are an order of magnitude slower than any other site cored in the African rift valley lakes, and the oldest sediments in these cores may be as much as 100,000 years in age. No comparable high-quality, high-resolution, continuous paleoclimate records of such duration are available for the interior of equatorial Africa. Scientists will examine evidence of a 10 kyr "double" precessional cycle in the Lake Tanganyika paleolimnological record and to what extent the tempo of Northern Hemisphere ice volume fluctuation dominates the Lake Tanganyika system. This project is being conducted under the auspices of the IDEAL program (International Decade for the East African Lakes).