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

热带大陆气候的强迫机制：破译坦噶尼喀湖沉积物核心的 100 kyr 湖沼变化记录

• 批准号: 9813970
• 负责人: John King
• 金额: $ 1.51万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813970&HistoricalAwards=false
• 关键词: Forcing; Mechanisms; Tropical; Continental; Climate

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).

该奖项支持一个项目，该项目旨在开发详细的地质年代学，并对东非坦噶尼喀湖一个孤立的、沉积速率缓慢的盆地间山脊上的一套独特的6个沉积物岩心进行古湖泊代用分析。最初的工作表明，这个地方的沉积速率比非洲裂谷湖泊中任何其他地点的沉积速率都要慢一个数量级，而这些岩心中最古老的沉积物可能有10万年的历史。赤道非洲内部没有类似的高质量、高分辨率、连续的古气候记录。科学家们将研究坦噶尼喀湖古湖泊记录中10年“双”岁差周期的证据，以及北半球冰量波动的速度在多大程度上支配着坦噶尼喀湖系统。这个项目是在东非湖泊国际十年方案的主持下进行的。