Bündelantrag PASADO-Support 3: Identification of eolian input at the Laguna Potrok Aike drill site, Patagonia

这个项目是对讨论南半球沙尘影响的重要贡献。对南极冰芯的详细调查已经产生了一些关于远距离尘埃输送的出版物。指纹图谱分析表明，南南美洲（SSA）是沙尘的主要来源。尘埃可以与风系统的强度和方向有关，从而与古气候变化有关。SSA主要受南半球西风带（SHW）的影响，该西风带在冰期和间冰期之间沿纬度方向移动，从而影响被调动的沙尘量。源区内的沙尘记录有助于更好地了解海西风的迁移及其相关的古气候变化。2008年，在我们的研究区域Laguna Potrok Aike进行了湖泊深钻井活动（PASADO）。岩心保存了过去~50 ka的古气候记录。磁化率常用于海相岩心追踪风成输入。然而，我们的岩心起源于一个大型火山场的湖泊，携带磁化率的颗粒不仅是风成的。在本研究范围内，将对湖相记录中风成物质的指纹进行表征，并有助于揭示近50 ka的沙尘历史。

This project is a key contribution to the discussion on the impact of dust in the southern hemisphere. Detailed investigations of the Antarctic ice cores have resulted in several publications that deal with long-distance dust transport. Fingerprint analyses of the dust components revealed Southern South America (SSA) as the major source area. Dust can be related to strength and direction of the wind systems and thus to paleoclimatic changes.SSA is mainly influenced by the Southern Hemisphere Westerlies (SHW) that shift in latitudinal direction between glacial and interglacial times, thus influencing the amount of dust that is mobilized. The dust record inside the source area allows to better understand the migration of the SHW and the associated paleoclimatic changes.A lacustrine deep drilling campaign (PASADO) was carried out in 2008 in Laguna Potrok Aike, our study area. The cores hold a paleoclimatic record of the past ~50 ka. Magnetic susceptibility was often used in marine cores to trace eolian input. Our cores, however, originate from a lake in a large volcanic field, and grains carrying magnetic susceptibility are not only of eolian origin. Within the scope of this study, the fingerprint of eolian material in the lacustrine record will be characterized and help to reveal the dust history of the past ~50 ka.