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.

艾尔莎（Eifel Laminated Sediment Archive）项目于1999 - 2005年在艾菲尔干玛珥湖（Eifel dry maar lakes）钻取了16个长柱状沉积物，记录了0 - 140 ka的时间。HL 2和EI 2岩芯到达末次间冰期，其特征是每年层状沉积物（Sirocko等人，2005; Schaber & Sirocko，2005）。M1 S2 -5c的沉积物不是年纹层，而是事件纹层。这些事件是浊积岩、悬浮层、黄土层和火山灰，它们被用来对比16个岩心（Diss. K。Schaber，in prep.）。在本项目中，我们将详细评估30个不同的黄土层，这些黄土层可以在岩芯之间进行对比。单个黄土层的粒度分析是通过由Seelos和Sirocko（2005）开发的薄片超高分辨率粒度测量自动化方法完成的。将在所有可用的岩心中检测MIS 5e和MIS 1之间的30个黄土层的粒度组成，并对约20个统计粒度参数进行评估。地层厚度、地球化学和粒度组成的变化可以用来量化古风向，即从西或从东。西风带的指纹来自Buntsandstein（彩色）和Muschekalk（CaCO 3）地层，而东风主要侵蚀泥盆纪页岩和岩浆矿床，并且在地球化学和矿物学方面有所不同。主风向提供了关于导致沙尘输送的气象学的第一个指示。最有可能的现象是低气压系统穿越德国或邻近的北海，中尺度对流风暴内的下沉气流和强烈的地形流。

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