Collaborative Research: A 700-Year Tephrochronology of the Law Dome Ice Core, East Antarctica

0125560齐林斯基该奖项支持一个项目，该项目旨在分析来自法穹顶冰芯的火山特弗拉样本。洛穹顶冰芯是南极东部年代最早的冰芯，包含了至少过去700年来气候和大气化学的详细记录。洛穹顶核心似乎记录了几次全球火山喷发，包括著名的坦博拉1815年和未知的1809年事件，以及Huaynaputina 1600和Ruiz 1595事件。为了核实造成这些信号的源头喷发，以及区分南极和南半球局部喷发，将对过去700年的劳德穹顶冰芯进行年度分辨率的火山玻璃连续扫描。将在岩芯中含有最大酸性信号的部分进行分年度的Tephra分析。为了更好地评估来自冰芯的赤道大喷发对气候的影响，有必要将当地喷发及其相关的冰化学信号与这些较远来源的信号分开。通过火山玻璃的存在，结合对Siple Dome冰核的同类研究结果，对Law Dome冰芯中局部喷发的识别将改进过去700年来南极火山活动的现有年表。

0125560ZielinskiThis award supports a project to analyze samples from the Law Dome ice core for volcanic tephra. The Law Dome ice core is the best-dated ice core from East Antarctica and contains a detailed record of climate and atmospheric chemistry over at least the last 700 years. Several global volcanic eruptions appear to be recorded in the Law Dome core, including the well known Tambora 1815 and Unknown 1809 events, as well as the Huaynaputina 1600 and Ruiz 1595 events. To verify the source eruptions responsible for these signals, as well as to differentiate between local Antarctic and southern hemisphere eruptions, a continuous scan for volcanic glass at an annual resolution will be done on the last 700 years of the Law Dome ice core. Sub-annual tephra analyses will be done in the sections containing the largest acid signals in the core. To better evaluate the climatic impact of large equatorial eruptions from ice cores, it is necessary to isolate local eruptions and their associated glaciochemical signal from that of these more distant sources. The identification of local eruptions in the Law Dome core will improve upon the existing chronology of Antarctic volcanism over the last 700 years through the presence of volcanic glass in conjunction with the results from this same type of study on the Siple Dome ice core.