Collaborative Research: US GEOTRACES PMT: Quantification of Atmospheric Deposition and Trace Element Fractional Solubility

合作研究：美国 GEOTRACES PMT：大气沉积和微量元素溶解度的量化

• 批准号: 1756104
• 负责人: William Landing
• 金额: $ 16.31万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-03-15 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1756104&HistoricalAwards=false
• 关键词: Collaborative; Research; US; GEOTRACES; PMT

The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. An essential part of this effort is determining the sources of trace elements to the oceans, one of which is from the atmosphere: dust falling from the air, and rain, both deliver elements to the sea surface. This project would collect and analyze samples of rainwater and of particles from the atmosphere, along a U.S. GEOTRACES expedition from Alaska to Tahiti in the fall of 2018. The timing of the expedition corresponds to the part of the year with the highest atmospheric dust concentrations in the Gulf of Alaska and may also capture the tail end of peak fire season in Asia. In contrast, the southern end of the proposed ship track is known to have very low atmospheric dust. Aerosols will be influenced by human activity in Asia as well. The anticipated differences in atmospheric deposition along the ship track will allow the assessment of the role of this process on trace element and isotope cycling. The project will support a postdoctoral investigator. The relevance of ocean-atmosphere studies to the public will be communicated at campus open house events and in online forums in collaboration with the GEOTRACES management team.In alignment with the mission of GEOTRACES, the proposed research will address the following biogeochemical and oceanographic questions: 1) What is the magnitude of atmospheric aerosol deposition (wet and dry) to the surface of the Pacific Ocean? 2) What is the chemical composition of these aerosols and how does composition vary based on source (e.g. Alaskan glacial flour, Asian mineral dust, emissions from biomass burning, anthropogenic emissions)? 3) What is the fractional solubility of trace elements in Pacific aerosols and does solubility vary based on aerosol source? 4) What is the potential bioavailability of soluble aerosol Fe? 5) How is the soluble fraction of aerosol trace elements distributed across operationally defined size classes? 6) How does atmospheric deposition impact distributions of other GEOTRACES parameters? Atmospheric aerosol and precipitation samples will be collected over the 70-day expedition and the investigators will provide sub-samples to collaborators and other interested scientists. These samples will be analyzed for a suite of key trace elements from bulk and size-fractionated aerosol samples, aerosol leachates, and rain samples. A sequential extraction scheme designed to solubilize aerosol Fe as a function of its FeOx morphology and particle size will be used on selected samples because an understanding of aerosol trace element fractional solubility is fundamental to future work to assess the bioavailability of aerosol derived trace elements. The proposed work will provide data that directly contribute to the GEOTRACES objectives related to atmospheric deposition and will help to address temporal variability as this cruise section follows the CLIVAR/Repeat Hydrography P16N line.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

国际地理计划计划的目标是了解痕量化学元件及其同位素在海洋中的分布。这项工作的重要组成部分是确定海洋的微量元素来源，其中之一是从大气中：尘埃从空气中掉下来，雨水都将元素传递到海面。该项目将在2018年秋天沿美国从阿拉斯加到大溪地的美国地理探险，收集和分析大气中的雨水和颗粒样品。探险的时机对应于今年的一部分，其大气中的尘埃浓度最高。阿拉斯加湾，也可能捕捉亚洲高峰火季节的尾声。相比之下，众所周知，拟议的船只轨道的南端具有非常低的大气灰尘。气雾剂也将受亚洲人类活动的影响。沿着船舶轨道的大气沉积的预期差异将允许评估该过程对痕量元素和同位素循环的作用。该项目将支持博士后调查员。海洋 - 大气研究与公众的相关性将在校园开放日活动和在线论坛上与Geotraces Management团队合作进行交流。与Geotraces的使命一致，拟议的研究将解决以下生物地球化学和海洋学问题： 1）向太平洋表面的大气气溶胶沉积（潮湿和干）的大小是多少？ 2）这些气溶胶的化学成分是什么？成分如何根据来源（例如阿拉斯加冰川粉，亚洲矿物粉尘，生物质燃烧的排放，人为排放的排放）而变化？ 3）太平洋气溶胶中微量元素的分数溶解度是什么？溶解度会根据气溶胶源而变化？ 4）可溶性气溶胶Fe的潜在生物利用度是什么？ 5）如何在操作定义的大小类别上分布气溶胶痕量元件的可溶性部分？ 6）大气沉积如何影响其他Geotraces参数的分布？大气气溶胶和降水样品将在70天的探险中收集，调查人员将向合作者和其他有兴趣的科学家提供子样本。这些样品将分析来自大容量和尺寸分级的气溶胶样品，气溶胶浸出物和雨水样品的关键痕量元素。一种旨在溶解气溶胶FE作为其Feox形态和粒径的函数的顺序提取方案将用于选定的样品，因为对气溶胶痕量元件分数溶解度的了解对于评估气溶胶衍生痕量元件的生物利用度的未来工作至关重要。拟议的工作将提供直接有助于与大气沉积相关的地理目标目标的数据，并将有助于解决时间变异性，因为本巡航部分遵循Clivar/重复水文P16N线路。这一奖项反映了NSF的法定任务，并被认为值得获得支持。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。

项目成果

Bulk Aerosol Trace Element Concentrations and Deposition Fluxes During the U.S. GEOTRACES GP15 Pacific Meridional Transect

• DOI: 10.1029/2021gb007122
• 发表时间: 2022-01
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: C. Marsay;D. Kadko;W. Landing;C. Buck

Does Sea Spray Aerosol Contribute Significantly to Aerosol Trace Element Loading? A Case Study From the U.S. GEOTRACES Pacific Meridional Transect (GP15)

海喷雾气溶胶对气溶胶微量元素负荷有显着贡献吗？

• DOI: 10.1029/2022gb007416
• 发表时间: 2022
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: Marsay, Chris M.;Landing, William M.;Umstead, Devon;Till, Claire P.;Freiberger, Robert;Fitzsimmons, Jessica N.;Lanning, Nathan T.;Shiller, Alan M.;Hatta, Mariko;Chmiel, Rebecca
• 通讯作者: Chmiel, Rebecca

Biological, Physical, and Atmospheric Controls on the Distribution of Cadmium and Its Isotopes in the Pacific Ocean

太平洋镉及其同位素分布的生物、物理和大气控制

• DOI: 10.1029/2022gb007441
• 发表时间: 2023
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: Sieber, Matthias;Lanning, Nathan T.;Bunnell, Zachary B.;Bian, Xiaopeng;Yang, Shun‐Chung;Marsay, Chris M.;Landing, William M.;Buck, Clifton S.;Fitzsimmons, Jessica N.;John, Seth G.
• 通讯作者: John, Seth G.

210 Pb and 7 Be as Coupled Flux and Source Tracers for Aerosols in the Pacific Ocean

210 Pb 和 7 Be 作为太平洋气溶胶的耦合通量和源示踪剂

• DOI: 10.1029/2022gb007378
• 发表时间: 2022
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: Wei, Ziran;Cochran, J. Kirk;Horowitz, Evan;Fitzgerald, Patrick;Heilbrun, Christina;Kadko, David;Stephens, Mark;Marsay, Chris M.;Buck, Clifton S.;Landing, William M.
• 通讯作者: Landing, William M.

Quantifying Atmospheric Trace Element Deposition Over the Ocean on a Global Scale With Satellite Rainfall Products

• DOI: 10.1029/2019gl086357
• 发表时间: 2019-12
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: D. Kadko;W. Landing;C. Buck