PostDoctoral Research Fellowship

这是一项博士后奖学金，将支持一名早期职业科学家开展题为“评估新西兰在末次冰期极大期（LGM）期间对南极洲西部的沙尘来源”的项目。大气尘埃气溶胶是南大洋铁（Fe）的来源，而微量元素铁限制了南大洋的生物生产。据推测，在冰期气候期间，较高水平的气溶胶铁影响了海洋初级生产，从而影响了全球碳和氮循环，其影响程度远远超过目前。相对未风化的灰尘（如来自新西兰的）中的铁比来自风化的沉积物（如来自澳大利亚的）中的铁更容易溶解和生物利用。因此，在冰川时期，新西兰的大量沙尘输入意味着南大洋太平洋部分的铁施肥作用更大。该项目将验证一个假设，即在末次盛冰期，新西兰的年轻土壤是南大洋和西南极洲的重要尘埃来源。PI将通过收集年代确定的冰川期和其他风成源沉积物样本，分析其主要和微量元素化学以及锶、钕、铅和氦的同位素比率，来表征新西兰的粉尘来源。她将对Allan Hills（维多利亚地）和simple Dome A和Byrd 1968年深冰芯（南极洲西部）的冰川时代冰样本进行相应的测量，以评估南极洲这些以前未研究过的地区的尘埃来源。她还将使用一个完全耦合的全球气候模型来评估随着时间的推移，从新西兰到南极洲不同地区的尘埃运输的可能性，以及就南大洋太平洋部分沉积的尘埃的铁施肥潜力而言，新西兰与澳大利亚的相对气候重要性。PI将通过制作和传播外联视频，以及直接在社会经济和种族多样化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.