A Study of Atmospheric Dust in the WAIS Divide Ice Core Based on Sr-Nd-Pb-He Isotopes

1043471/Kaplan该奖项支持一个项目，该项目旨在从WAIS Divide冰芯获取第一组基于同位素的来源数据。由于缺乏WAIS的数据，甚至无法基本了解不同来源的尘埃是否在南纬的太平洋和大西洋地区肆虐。特别需要对新的WAIS冰隔岩芯中的尘埃进行精确的同位素测量，因为这些数据将与其他高频指标协同整合，例如尘埃浓度和通量，以及二氧化碳。更高分辨率的替代物将弥合我们对同一个年代良好、保存完好的核心的观察之间的差距。该项目的学术价值在于，拟议的分析将有助于WAIS划分项目的科学主题。无论是主动驱动还是被动记录，沙尘都是区域和全球气候中最重要但最不为人所知的组成部分之一。与沙尘气候模型者的合作和专家讨论将导致在了解沙尘和过去的大气环流模式以及南部纬度周围的气候方面取得重要进展，并有助于排除不太可能进入冰盖的空气轨迹。该项目将提供数据，帮助评估模拟尘埃模式和循环的模型，以及在不同气候状态下来源、空气轨迹和输送过程以及沉积到冰盖的变化的相对重要性。除了与WAIS冰芯项目直接相关的学科外，包括古海洋学和尘埃古气候学社区在内的一系列学科将对这些结果产生广泛的兴趣。该项目的更广泛影响包括基础设施和专业发展，因为拟议的研究将启动LDEO与其他WAIS科学家和具有气候和沙尘专业知识的建模人员之间的合作。大多数研究人员仍处于职业生涯的早期阶段，因此该项目将促进长期关系。这其中包括一名来自UMaine的研究生，一名将参与实验室工作的哥伦比亚大学本科生，以及一名LDEO博士后科学家，以及可能参与国际项目PERE-ICETRICS的另一名学生。拟议的研究将拓宽三个私人投资者的科学前景，他们从各种其他陆地和海洋地质学的角度进入南极冰芯科学。外联活动包括与哥伦比亚大学地球研究所的科学作家互动，发布新闻稿和相关的博客网站，公开演讲，以及参与纽约市艺术和科学界之间的一项艺术/科学倡议，以弥合科学知识和公众认知之间的差距。

1043471/KaplanThis award supports a project to obtain the first set of isotopic-based provenance data from the WAIS divide ice core. A lack of data from the WAIS prevents even a basic knowledge of whether different sources of dust blew around the Pacific and Atlantic sectors of the southern latitudes. Precise isotopic measurements on dust in the new WAIS ice divide core are specifically warranted because the data will be synergistically integrated with other high frequency proxies, such as dust concentration and flux, and carbon dioxide, for example. Higher resolution proxies will bridge gaps between our observations on the same well-dated, well-preserved core. The intellectual merit of the project is that the proposed analyses will contribute to the WAIS Divide Project science themes. Whether an active driver or passive recorder, dust is one of the most important but least understood components of regional and global climate. Collaborative and expert discussion with dust-climate modelers will lead to an important progression in understanding of dust and past atmospheric circulation patterns and climate around the southern latitudes, and help to exclude unlikely air trajectories to the ice sheets. The project will provide data to help evaluate models that simulate the dust patterns and cycle and the relative importance of changes in the sources, air trajectories and transport processes, and deposition to the ice sheet under different climate states. The results will be of broad interest to a range of disciplines beyond those directly associated with the WAIS ice core project, including the paleoceanography and dust- paleoclimatology communities. The broader impacts of the project include infrastructure and professional development, as the proposed research will initiate collaborations between LDEO and other WAIS scientists and modelers with expertise in climate and dust. Most of the researchers are still in the early phase of their careers and hence the project will facilitate long-term relationships. This includes a graduate student from UMaine, an undergraduate student from Columbia University who will be involved in lab work, in addition to a LDEO Postdoctoral scientist, and possibly an additional student involved in the international project PIRE-ICETRICS. The proposed research will broaden the scientific outlooks of three PIs, who come to Antarctic ice core science from a variety of other terrestrial and marine geology perspectives. Outreach activities include interaction with the science writers of the Columbia's Earth Institute for news releases and associated blog websites, public speaking, and involvement in an arts/science initiative between New York City's arts and science communities to bridge the gap between scientific knowledge and public perception.