Reconstruction of 30 distinct dust and loess events during the last glacial cycle: Quantification of the hemisheric, regional, and local forcing of such weather extremes during the past

重建末次冰期期间 30 次不同的沙尘和黄土事件：对过去此类极端天气的半球、区域和局部强迫进行量化

• 批准号: 33605771
• 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: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/33605771?language=en
• 关键词: Reconstruction; 30; distinct; dust; loess

16 long sediment cores from Eifel dry maar lakes have been drilled between 1999 and 2005 by the ELSA project (Eifel Laminated Sediment Archive) and document the time 0 -140 ka. The cores HL2 and EI2 reach the last interglacial, which is characterized by annually laminated sediments (Sirocko et al., 2005; Schaber & Sirocko, 2005). The sediments of MlS2-5c are not annually laminated, but event laminated. These events are turbidites, suspension layers, loess layers and tephra, which are used to correlate the 16 cores (Diss. K. Schaber, in prep.). In this project we will evaluate in detail 30 distinct loess layers, which can be correlated between the cores. Grain size analysis of individual loess layers is done by the automated method of ultra high resolution grain size measurements from thin sections, which was developed by Seelos & Sirocko (2005). The grain size composition of 30 individual loess layers between MIS 5e and MIS1 will be detected in all available cores and will be evaluated for about 20 statistical grain size parameters. Gradients in layer thickness, geochemistry and in the grain sizes composition can then be used to quantify the principle paleo wind direction, i.e from the west or from the east. Westwinds carry fingerprints from Buntsandstein (colour) and Muschekalk (CaCO3) strata, whereas winds from the east erode mainly Devonian shales and magmatic deposits and are different in geochemistry and mineralogy. The principle wind direction provides a first indication about the meteorology that lead to the dust transport. Most likely phenomena are low pressure systems moving across Germany or the adjacent North Sea, downdrafts within mesoscale convective storms and intense orographic flows.

Elsa Project（Eifel层压的沉积物档案馆）在1999年至2005年之间钻了16个来自Eifel Dry Maar湖泊的长沉积物核心，并记录了时间0 -140 KA。核HL2和EI2达到了最后的冰川间，其特征是每年层压沉积物（Sirocko等，2005； Schaber＆Sirocko，2005）。 MLS2-5C的沉积物每年不是层压，而是层压。这些事件是浊度，悬浮层，黄土层和tephra，用于将16个核心相关联（Diss。K.Schaber，Prep。）。在这个项目中，我们将详细评估30个不同的黄土层，这可以在核心之间关联。单个黄土层的晶粒尺寸分析是通过Seelos＆Sirocko（2005）开发的薄部分的超高分辨率晶粒尺寸测量方法的自动化方法进行的。将在所有可用的核心中检测到MIS 5E和MIS1之间30个单独的黄土层的晶粒尺寸组成，并将评估约20个统计晶粒尺寸参数。然后可以使用层厚度，地球化学和晶粒大小组成的梯度来量化原理古风方向，即从西方或东方量化。西风携带Buntsandstein（Color）和Muschekalk（CACO3）地层的指纹，而东部的大风主要是泥盆纪的页岩和岩浆沉积物，在地球化学和矿物学上是不同的。主要风向提供了有关导致尘埃运输的气象的第一个指示。最有可能的现象是跨德国或相邻北海的低压系统，中尺度对流风暴中的下降和强烈的地形流。

项目成果

A continuous high‐resolution dust record for the reconstruction of wind systems in central Europe (Eifel, Western Germany) over the past 133 ka

过去 133 ka 中欧（德国西部埃菲尔）风系统重建的连续高分辨率尘埃记录

• DOI: 10.1029/2009gl039716
• 发表时间: 2009
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Klemens Seelos;Frank Sirocko;Stephan Dietrich
• 通讯作者: Stephan Dietrich

A new windstorm proxy from lake sediments: A comparison of geological and meteorological data from western Germany for the period 1965–2001

来自湖泊沉积物的新风暴代理：1965 年至 2001 年德国西部地质和气象数据的比较

• DOI: 10.1029/2008jd011643
• 发表时间: 2001
• 期刊: Journal of Geophysical Research
• 作者: Stephan Pfahl;Frank Sirocko;Klemens Seelos;Stephan Dietrich;Andreas Walter;Heini Wernli
• 通讯作者: Heini Wernli