Continuous High Resolution Ice-Core Chemistry using ICP-MS at Siple Dome

该奖项提供了一年的支持，以使用新开发的技术，其中冰芯熔化器与电感耦合等离子体质谱仪（ICP-MS）和传统的连续流分析（CFA）系统相结合，以测量西南极洲Siple Dome冰芯上化学和微量元素沉积的连续时间序列。将使用一个耦合的冰芯熔化器、ICP-MS和CFA系统，以极高的深度分辨率（~2 cm）测量Siple Dome A芯顶部54 m的一些元素、同位素和化学物质的浓度。从附近但低得多的积累在Siple Dome的J-核心站点的~6 m的分析中获得的试验数据，以及从格陵兰Summit获得的更广泛的结果表明，将有可能获得至少12个季节性变化元素的精确共记录的高质量记录（钠、镁、铝、钾、钙、铁、锰、铷、锶、锆、钡、铅）和三种其他化学物质和离子（铵，硝酸盐，钙离子）与此系统。在这项拟议的研究中，我们还将在我们的系统中添加硫酸盐的连续测量。由于国家冰芯实验室存档了足够多的来自Siple Dome的这些深度的冰芯，因此拟议的研究将不需要实地考察。 这些元素示踪剂的连续的、非常高分辨率的~350年记录将提高以前在Siple Dome核上进行的化学和同位素测量的价值，并且对于冰核代理和与厄尔尼诺-南方涛动（ENSO）有关的现代仪器数据之间的比较以及验证大气环流的模型模拟特别有价值。这些数据，以及通过这项研究获得的专业知识，将是非常宝贵的，当这种新的化学分析技术最终应用于深冰芯记录的快速气候变化事件的研究。

This award provides one year of support to use newly developed technology in which an ice-core melter is coupled with both an Inductively Coupled Plasma - Mass Spectrometer (ICP-MS) and a traditional Continuous Flow Analysis (CFA) system, to measure a continuous time series of chemical and trace element deposition on the Siple Dome ice core from West Antarctica. A coupled ice-core melter, ICP-MS, and CFA system will be used to measure concentrations of a number of elements, isotopes and chemical species at very high depth resolution (~2-cm) in the top 54 m of the Siple Dome A-core. Pilot data from analyses of ~6 m from the nearby but much lower accumulation J-core site at Siple Dome, together with more extensive results from Summit, Greenland, indicate that it will be possible to obtain exactly co-registered, high-quality records of at least 12 seasonally varying elements (sodium, magnesium, aluminum, potassium, calcium, iron, manganese, rubidium, strontium, zirconium, barium, lead) and three other chemical species and ions (ammonium, nitrate, calcium ion) with this system. Under this proposed research, we will also add continuous measurements of sulfate to our system. Because more than sufficient core from Siple Dome for these depths is archived at the National Ice Core Laboratory, the proposed research will require no fieldwork. The continuous, very high-resolution, ~350-y record of these elemental tracers will enhance the value of previous chemical and isotopic measurements that have been made on the Siple Dome core and will be particularly valuable for comparisons between ice-core proxies and modern instrumental data related to El Nino-Southern Oscillation (ENSO) as well as for validation of model simulations of atmospheric circulation. These data, and the expertise gained through this research, will be invaluable when this novel chemical analysis technology is eventually applied to deep ice-core records for the study of rapid climate-change events.