PostDoctoral Research Fellowship

这是一个博士后奖学金，将支持一个早期的职业科学家从事一个项目，题为：“评估新西兰作为一个来源的灰尘，以W。最后一次冰川盛期（LGM）的南极洲。大气尘埃气溶胶是南大洋铁（Fe）的来源，微量营养素Fe限制了生物生产。据推测，在冰河时代的气候，更高水平的气溶胶铁影响海洋初级生产，从而全球碳和氮循环，大大超过目前。相对未风化的灰尘（如来自新西兰）中的铁比风化沉积物（如来自澳大利亚）中的铁更易溶解和生物可利用。 因此，一个显着的新西兰灰尘输入在冰期意味着更大的作用，铁施肥的南大洋的太平洋部门。该项目将检验这样一种假设，即新西兰的年轻土壤是末次冰盛期南大洋和南极洲西部的一个重要尘埃来源。PI将通过从年代久远的冰川源和其他风成源沉积物中收集样本，并分析其主要和微量元素化学以及锶、钕、铅和氦同位素比率，来表征新西兰尘埃源。她将对来自艾伦山（维多利亚地）和西普尔圆顶A和伯德1968年深冰芯（南极洲西部）的冰川期冰样本进行推论测量，以评估这些以前未研究过的南极洲地区的尘埃来源。她还将使用一个完全耦合的全球气候模型来评估从新西兰到南极洲不同地区的尘埃运输的可能性，以及新西兰与澳大利亚在沉积在南大洋太平洋部分的尘埃的铁施肥潜力方面的相对气候重要性。 PI将通过制作和传播宣传视频以及直接在社会经济和种族多样的纽约市中学课堂上工作，促进对科学和社会的更广泛影响，她将在那里教授一个地球科学单元，将她的研究概念与学生自己的经验联系起来。

This is a post-doctoral fellowship award that will support an early-career scientist to work on a project entitled: "Evaluating New Zealand as a source of dust to W. Antarctica during the Last Glacial Maximum (LGM)". Atmospheric dust aerosols are a source of iron (Fe) to the Southern Ocean, where micronutrient Fe limits biological production. It is hypothesized that during ice age climates, higher levels of aerosol Fe impacted marine primary production, and thus the global carbon and nitrogen cycles, substantially more than at present. Iron in relatively unweathered dust (such as that from New Zealand) is more soluble and biologically available than that from weathered sediments (such as from Australia). Therefore, a significant New Zealand dust input during glacial times implies a greater role for Fe fertilization of the Southern Ocean's Pacific sector. This project will test the hypothesis that young soils from New Zealand were a significant source of dust to the Southern Ocean and hence West Antarctica during the Last Glacial Maximum. The PI will characterize the New Zealand dust source by collecting samples from well-dated glaciogenic and other aeolian source sediments and analyze them for major and trace element chemistry and strontium, neodymium, lead, and helium isotopic ratios. She will make corollary measurements on samples of glacial-age ice from the Allan Hills (Victoria Land) and the Siple Dome A and Byrd 1968 deep ice cores (West Antarctica) to assess dust provenance in these previously unstudied regions of Antarctica. She also will use a fully coupled global climate model to evaluate the likelihood of dust transport from New Zealand to different regions of Antarctica through time, and the relative climatic importance of New Zealand vs. Australia in terms of iron-fertilization potential of dust deposited in the Pacific sector of the Southern Ocean. The PI will promote broader impacts for science and society by producing and disseminating an outreach video and by working directly in a socioeconomically and racially diverse New York City middle school classroom, where she will teach an earth sciences unit linking concepts from her research to students' own experiences.