Volcanic signatures of the Toba-Eruption (73 ka B.P.) in the EDML ice core (Antarctica) and southern ocean sediment cores: Implications for climate impact and climate teleconnections

EDML 冰芯（南极洲）和南大洋沉积岩芯中多巴火山喷发（73 ka B.P.）的火山特征：对气候影响和气候遥相关的影响

• 批准号: 197691157
• 负责人: Professor Dr. Gerhard Wörner
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/197691157?language=en
• 关键词: Volcanic; signatures; Toba; Eruption; 73

The Toba eruption (73 ka B.P., Indonesia) is the largest volcanic event in the Quaternary period but its sulfuric acid signal so far has only been found in a Greenland ice core. Sulfuric acid aerosols forming by volcanic SO2 in the stratosphere disperse solar radiation and thereby have a significant global cooling effect. Tephras enhance the cooling effect because they fertilize ocean water by introduction of nutrients to the ocean and promote plankton photosynthetic activity, leading to net sink of CO2 due to planktonic fixation of CO2. This project, therefore, seeks to verify the presences of the Toba signal in the EDML ice core (Antarctica) and the Toba tephra layer in Southern Ocean sediment cores to provide essential basic data on an amount of sulfuric acid aerosols and the southward distribution of tephra. These lead to comprehensively evaluate its global impact. It also seeks to verify the presence of common volcanic signals as “tie-points” between Greenland and Antarctic ice cores to synchronize the cores and estimate a phase relationship due to the bipolar seesaw phenomenon.

多巴火山爆发（73 ka B.P.，印度尼西亚）是第四纪最大的火山事件，但其硫酸信号到目前为止只在格陵兰冰芯中发现。火山SO2在平流层形成的硫酸气溶胶分散了太阳辐射，从而产生了显著的全球冷却效应。特弗拉斯增强了冷却效果，因为它们通过向海洋引入营养物质来肥沃海水，并促进浮游生物的光合作用活动，从而由于浮游生物对二氧化碳的固定而导致二氧化碳的净吸收。因此，该项目力求核实EDML冰芯（南极洲）和南大洋沉积物芯中Toba火山灰层中Toba信号的存在，以提供关于硫酸气溶胶数量和火山灰向南分布的基本数据。这导致全面评估其全球影响。它还试图核实格陵兰和南极冰芯之间是否存在作为“联系点”的共同火山信号，以使冰芯同步，并估计两极跷跷板现象造成的相位关系。