Grain size analysis of sediments from deep Lake Malawi

马拉维深湖沉积物的粒度分析

• 批准号: 21583617
• 负责人: Professor Dr. Frank Sirocko
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21583617?language=en
• 关键词: Grain; size; analysis; sediments; deep

We propose to study the Holocene and last glacial sections of a well dated piston core from lake Malawi. This will be done by high resolution digital image analysis (sample width of 300 (m) of thin sections, based on the RADIUS method developed by Seelos & Sirocko, 2005. The Malawi sediments are partly laminated with an average sedimentation rate of 0.33 mm/yr. Thus the grain size record will have annual resolution, and allow to detect the history of eolian dust deflation and riverine flash floods, presenting an annual resolution time series of climate change in equatorial Africa for the last 25.000 years, in particular evaluating the low latitude climate during northern hemisphere cold events like the Little Ice age, the 8.2 ka event, Younger Dryas and Heinrich Events. This work is also a methodological study, because we will have to develop a new RADIUS algorithm for the very fine grained sediments of large lakes. When this algorithm is developed successfully in the first year of the project, the study can be continued further into the past on the ICDP Malawi sediments, but be also applied to other ICDP cores from deep lakes.

我们建议研究马拉维湖良好的活塞核心的全新世和最后冰川切片。这将通过高分辨率的数字图像分析（基于Seelos＆Sirocko开发的半径方法的300（m）样品宽度的样品宽度（300（m）的样品宽度，马拉维沉积物的平均沉积速率部分地层压为0.33 mm/yr的平均沉积速率。赤道非洲的气候变化在过去的250年中，特别是评估北半球的降低气候，例如小冰河时代，8.2 KA事件，年轻的Dryas和Heinrich事件也是一种方法论研究，因为我们将不得不开发新的Radius Algorith new new new new new new new new new ne ne al ate ne alg severs alg ealg。在ICDP马拉维沉积物上，可以进一步延续研究，但也可以应用于深层湖中的其他ICDP核心。