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

该奖项支持一个关于雪坑和冰/冰岩芯的物理性质研究项目，其具体目标包括地层分析，包括确定积累率、年层数、深度、冰和风壳以及谷物随深度增长的速度。还将研究雪的致密率以及这些参数与过去200年南极积雪的气象学和气候学之间的关系。该项目还将通过地层学和化学的共同登记来确定积累的季节性，并确定晶界的化学物质，这些物质如何随着深度/密度（以及温度）、降水而变化，并可能影响晶粒生长。将对织物进行分析，包括随深度、波浪位置的变化，以及气候/化学是否存在任何变化。美国ITASE项目的大空间覆盖范围为确定这些参数如何受到大范围温度、降水和地形影响提供了机会。该项目的智力价值包括ITASE是地球上相当于极地研究船的事实，它提供了独特的、后勤高效的、多维的（x、y、z和时间）大气、冰盖及其历史的视图。物理特性测量/分析是理解积雪受到的动态过程的一个组成部分。该领域的最新进展以及多个核心站点提供了一个极好的机会，可以更广泛地了解影响固化的空间、时间和物理变量以及对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泛的科学界使用。美国ITASE有广泛的公众宣传计划，为许多学生提供了体验多学科南极研究的重要机会。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（New England Science Collaborative）的成员，该组织基于最近的科学进展，就气候变化向公众进行教育。

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.