A New Ice Core from the Devon Ice Cap Canadian Arctic: Continued Development of High-resolution Proxy Records to Evaluate the Regionalization of Climate in the Circum-Arctic

提案编号：主要研究人员将分析和解释来自加拿大德文郡岛德文郡冰帽的一个新的300英尺长冰芯的主要离子、不溶性微粒和甲磺酸（MSA）的时间序列。 这是一个与加拿大地质调查局（GSC）和长冈冰雪研究所合作的项目。 GSC的科学家将分析氧同位素分析、直流固体电导率（ECM）和年度熔体层的百分比。 其结果将是一个连续的，高分辨率（亚年度至十年）的多变量记录全新世变化的高北极。 这些结果还将补充Penny冰帽核心（巴芬岛）的结果。 在对第一个德文郡冰芯取芯时进行的雪坑研究将提供有关冰川化学物质和不溶性微粒的现代特征的关键信息。 这个新的核心是必要的，以验证或反驳那些不一致的发现，在以前钻德文郡岛冰芯与其他核心钻加拿大高Arctic.分析的所有主要可溶性和不溶性成分的大气保存在德文郡冰芯将使主要调查人员，以确定在加拿大北极东部的古大气的组成。 这些结果将提供关于全新世气候变化的时间和原因以及这种变化的区域化的重要信息。 研究结果还将使主要研究人员能够建立海盐物种与近期海冰范围之间的正相关关系，以提供重建相对海冰范围所需的重要数据以及过去10，000年来该范围的变化速度。 这些数据可用于更好地了解海冰范围如何影响人口。 这种高分辨率的核心是至关重要的，因为主要的偶发事件，如火山爆发和大的生物量燃烧事件，这是明显的冰芯，被纳入分析的因素。 这些研究结果应有助于评估北极地区人为排放沉积的空间变异性。 汇编来自环北极冰芯的所有数据集将对了解北极可能对全球变化产生的影响作出重大贡献。

Proposal Number: OPP-9808960Principal Investigator: Zielinski, GregoryThe Principal Investigators will analyze and interpret time series of major ions, insoluble microparticles, and methanesulfonic acid (MSA) from a new 300-foot long ice core from the Devon Ice Cap, Devon Island, Canada. This is a collaborative project with the Geological Survey of Canada (GSC) and Nagaoka Institute of Snow and Ice Studies. Oxygen isotope analyses, direct-current solid electric conductivity (ECM) and the percentage of annual melt layers will be analyzed by scientists at GSC. The results will be a continuous, high-resolution (subannual to decadal) multivariate record of Holocene change of the high Arctic. The results will also complement those from the Penny Ice Cap core (Baffin Island). Snowpit studies that were done while coring the first Devon ice core will provide critical information on the modern characteristics of both the glaciochemical species and insoluble microparticles. This new core is necessary to validate or refute those incongruous findings found in the previously drilled Devon Island ice core with other cores drilled around the Canadian High Arctic.Analyses of all the major soluble and insoluble components of the atmosphere as preserved in the Devon ice core will enable the Principal Investigators to determine the composition of the paleoatmosphere in the eastern Canadian Arctic. The results should provide important information on the timing and cause of climatic change during the Holocene and the regionalization of that change. The results will also allow the Principal Investigators to establish a positive relationship between sea salt species and recent sea-ice extent to provide important data needed to reconstruct relative sea ice extent and the rapidity of changes in that extent over the last 10,000 years. These data may be used to gain a better understanding of how human populations were impacted by sea ice extent. This high-resolution core is critical as major episodic events such as volcanic eruptions and large biomass burning events, which are evident in ice cores, are factored into the analyses. These findings should contribute to the evaluation of spatial variability of anthropogenic emission deposition in the Arctic. The compilation of all the data sets from circum-arctic ice cores will make a major contribution in understanding the impact that the Arctic may have on global change.