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

首席研究员：Zielinski， gregory首席研究员将分析和解释主要离子，不溶性微粒和甲烷磺酸（MSA）的时间序列，这些物质来自加拿大德文岛德文冰帽的一个新的300英尺长的冰芯。这是一个与加拿大地质调查局（GSC）和长冈冰雪研究所的合作项目。氧同位素分析、直流固体电导率（ECM）和年融化层的百分比将由GSC的科学家进行分析。结果将是北极高地全新世变化的连续、高分辨率（次年至年代际）多变量记录。这些结果也将补充Penny冰帽核心（巴芬岛）的结果。在德文郡第一个冰芯取芯时进行的雪坑研究将提供关于冰川化学物种和不溶性微粒现代特征的关键信息。这个新的冰芯对于验证或反驳之前钻探的德文岛冰芯与加拿大高北极周围钻探的其他冰芯所发现的不一致的发现是必要的。对德文冰芯中保存的大气中所有主要可溶和不可溶成分的分析，将使首席研究员能够确定加拿大东部北极地区古大气的组成。这些结果将为全新世气候变化的时间和原因以及变化的区域化提供重要信息。这些结果还将使首席调查员能够在海盐种类和最近的海冰范围之间建立积极的关系，从而提供重建相对海冰范围和过去一万年中该范围变化的速度所需的重要数据。这些数据可以用来更好地了解海冰范围对人口的影响。这种高分辨率的冰芯是至关重要的，因为火山爆发和大型生物质燃烧事件等重大偶发事件，在冰芯中很明显，被纳入分析因素。这些发现将有助于评估北极人为排放沉积的空间变异性。北极周围冰芯的所有数据集的汇编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.