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

[1255 . 49]邓巴：该奖项支持了一个项目，该项目分析了劳多姆冰芯火山火山的样品。洛多姆冰芯是东南极洲最准确的冰芯，它包含了至少过去700年里气候和大气化学的详细记录。几次全球火山爆发似乎都记录在洛多姆岩心中，包括著名的坦博拉1815年和未知的1809年事件，以及埃纳普蒂纳1600年和鲁伊斯1595年事件。为了验证产生这些信号的喷发源，以及区分南极和南半球的局部喷发，将对洛多姆冰芯过去700年的火山玻璃进行年度分辨率的连续扫描。在岩心中含有最大酸信号的部分将进行分年次的温度分析。为了更好地评估赤道冰芯大喷发对气候的影响，有必要将当地喷发及其相关的冰川化学信号与这些更遥远的来源分离开来。通过火山玻璃的存在，结合对simple Dome冰芯的同类研究结果，对Law Dome岩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。

0125549DunbarThis 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.