The Physical Properties of the US ITASE Firn and Ice Cores from South Pole to Taylor Dome

0538494 Meese该奖项支持一个对雪坑和积雪/冰芯进行物理特性研究的项目，其具体目标包括地层分析，包括确定累积速率、年度层、深度白霜、冰和风结皮以及随深度的颗粒生长速率。 还将研究南极洲过去200年积雪的积雪密度以及这些参数与气象学和气候学的关系。 该项目还将通过地层学和化学的共同登记以及颗粒边界处化学物质的确定来确定累积的季节性，这些物质如何随着深度/致密化（以及温度）、降水而变化，并可能影响颗粒生长。将进行结构分析，包括深度变化、起伏位置以及是否存在气候/化学变化。美国ITASE计划的大空间覆盖范围提供了确定这些参数如何受到大范围温度、降水和地形效应影响的机会。该项目的智力价值包括，ITASE相当于一艘极地研究船的陆地探测器，提供了独特的、后勤效率高的、多维度（x、y、z和时间）的大气层、冰盖及其历史视图。物理特性测量/分析是了解积雪动态过程的一个组成部分。该领域的最新进展沿着多个核心站点提供了一个极好的机会，以获得更广泛的理解的空间，时间和物理变量的影响Firnification和气候解释可能产生的影响。就更广泛的影响而言，美国ITASE及其国际ITASE合作伙伴收集的数据可供广大科学界使用。美国ITASE有一个广泛的公共宣传计划，并为许多学生提供了重要的机会，体验多学科的南极研究。 一名研究生、一名博士后和至少一名本科生将得到这项工作的资助。米斯博士也是新英格兰科学合作组织的成员，该组织根据最近的科学进步教育公众气候变化。

0538494MeeseThis award supports a project for physical properties research on snow pits and firn/ice cores with specific objectives that include stratigraphic analysis including determination of accumulation rates, annual layers, depth hoar, ice and wind crusts and rates of grain growth with depth. Studies of firn densification rates and how these parameters relate to the meteorology and climatology over the last 200 years of snow accumulation in Antarctica will also be investigated. The project will also determine the seasonality of accumulation by co-registration of stratigraphy and chemistry and determination of chemical species at the grain boundaries, how these may change with depth/densification (and therefore temperature), precipitation, and may affect grain growth. Fabric analyses will be made, including variation with depth, location on undulations and if any variation exists with climate/chemistry. The large spatial coverage of the US ITASE program offers the opportunity to determine how these parameters are affected by a large range of temperature, precipitation and topographic effects. The intellectual merit of the project includes the fact that ITASE is the terrestrial equivalent of a polar research vessel that provides a unique, logistically efficient, multi-dimensional (x, y, z and time) view of the atmosphere, ice sheet and their histories. Physical properties measurements/ analyses are an integral part of understanding the dynamic processes to which the accumulated snow is subjected. Recent advancements in the field along with multiple core sites provide an excellent opportunity to gain a much broader understanding of the spatial, temporal and physical variables that impact firnification and the possible resultant impact on climatic interpretation. In terms of broader impacts, the data collected by US ITASE and its international ITASE partners is available to a broad scientific community. US ITASE has an extensive program of public outreach and provides significant opportunities for many students to experience multidisciplinary Antarctic research. A graduate student, a post-doctoral fellow and at least one undergraduate would be funded by this work. Dr. Meese is also a member of the New England Science Collaborative, an organization that educates the public on climate change based on recent scientific advancements.