Glacial terrestrial climate in the southern high latitudes: The potential of the PASADO core from southern Patagonia

南部高纬度地区的冰川陆地气候：巴塔哥尼亚南部 PASADO 核心的潜力

• 批准号: 247223272
• 负责人: Professorin Dr. Gesine Mollenhauer
• 金额: --
• 依托单位: Sektion Marine Geochemie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/247223272?language=en
• 关键词: Glacial; terrestrial; climate; southern; latitudes

The southern Hemisphere westerlies are suggested to have a pivotal influence on atmospheric CO2 changes on glacial-interglacial as well as millennial time-scales. In order to evaluate their significance independent records of wind-strength at decisive latitudes are needed. The PASADO drill-core from Laguna Potrok Aike (52°S) in southern Patagonia is a unique terrestrial archive at southern high latitudes. It provides the possibility to infer wind-intensity changes by reconstructing the isotopic lake-water balance driven by wind-induced evaporation. Investigations of samples covering the Holocene indicate the potential of this approach. In order to evaluate the possibility for extending these analyses into the last Glacial, covering critical intervals such as Antarctic warm events, we propose to investigate a series of initial samples from the glacial section of the PASADO core. If successful, these analyses will form the basis for further investigations in higher temporal resolution.

南半球西风带在冰期-间冰期和千年时间尺度上对大气CO2变化具有关键影响。为了评价它们的意义，需要在确定纬度的独立风强度记录。巴塔哥尼亚南部Laguna Potrok Aike（52°S）的PASADO钻孔岩心是南部高纬度地区独特的陆地档案。它提供了通过重建风致蒸发驱动的同位素湖水平衡来推断风强度变化的可能性。对覆盖全新世的样品的调查表明了这种方法的潜力。为了评估将这些分析扩展到末次冰期的可能性，包括南极变暖事件等关键时间间隔，我们建议研究PASADO岩心冰川部分的一系列初始样本。如果成功，这些分析将为更高时间分辨率的进一步研究奠定基础。