US GEOTRACES PMT: Shipboard determination of key dissolved trace elements

US GEOTRACES PMT：关键溶解微量元素的船上测定

• 批准号: 1736906
• 负责人: Mariko Hatta
• 金额: $ 43.88万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-11-01 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1736906&HistoricalAwards=false
• 关键词: US; GEOTRACES; PMT; Shipboard; determination

This project will provide shipboard measurements of the dissolved trace elements aluminum (Al), iron (Fe), and manganese (Mn) during an Alaska to Tahiti cruise that will sail as part of the US GEOTRACES Pacific Meridional Transect (PMT). The PMT expedition is part of the international GEOTRACES program designed to improve understanding of global ocean biogeochemical cycles. The growth of microscopic oceanic plants in surface waters depends on the availability of certain trace elements (particularly dissolved Fe). In addition, the distribution of this and other trace elements record current and past chemical and biological processes in the ocean. The PMT cruise track includes multiple unique oceanic conditions and thus the results of the work will provide important insight into diverse global ocean processes. For broader scientific impact, results will be incorporated into models that address the current and future role of the ocean in global processes. Assessing the distribution of trace elements in the Clarion-Clipperton Fracture Zone, along the cruise track, will also provide an important baseline for this region where seabed mining of manganese nodules is planned. Educational outreach will take place with a mid-cruise stop in Hilo, Hawaii to engage local students with visits to the ship. Direct exposure to a working oceanographic research vessel together with a post-cruise follow up visit will provide students with a unique opportunity to discuss the findings from the expedition directly with the scientists engaged in the project.To develop the data sets required for new understanding of the relative importance of trace element input processes in establishing oceanic chemical distributions, seawater samples from the entire water column will be collected using a custom designed sampling package at 41 locations during the 62-day cruise. The northern part of the cruise track originates in a region where very low concentrations of dissolved Fe in surface waters limit plant growth. Further to the south, increased atmospheric deposition of mineral dust blown from the continents will be traced by measuring the dissolved Al concentration in surface waters. The addition of this dust also adds dissolved Fe. Potential additional inputs of Fe from coastal regions will be identified by coincident increases in dissolved Mn concentrations. The project will compare and correlate variations in Al, Fe, and Mn to quantify and identify distinct addition processes along the cruise track. By using shipboard flow injection analysis to provide near real-time measurements for these trace elements, the potential exists to modify sampling strategies for maximum scientific return. The shipboard results will also help identify any sampling contamination problems that are a constant risk when collecting these low-level trace elements. Altogether, the shipboard analysis of these essential elements is an essential activity to ensure success of the GEOTRACES PMT.

该项目将在阿拉斯加至塔希提岛航行期间提供船上溶解的微量元素铝 (Al)、铁 (Fe) 和锰 (Mn) 测量，该航行将作为美国 GEOTRACES 太平洋经线横断线 (PMT) 的一部分。 PMT 探险是国际 GEOTRACES 计划的一部分，旨在增进对全球海洋生物地球化学循环的了解。地表水中微观海洋植物的生长取决于某些微量元素（特别是溶解的铁）的可用性。 此外，这种元素和其他微量元素的分布记录了海洋中当前和过去的化学和生物过程。 PMT巡航轨迹包括多种独特的海洋条件，因此工作结果将为了解不同的全球海洋过程提供重要的见解。为了产生更广泛的科学影响，研究结果将被纳入模型中，以解决海洋当前和未来在全球进程中的作用。评估克拉里昂-克利珀顿断裂带沿邮轮航线的微量元素分布也将为该地区计划进行锰结核海底采矿提供重要基线。教育推广活动将在夏威夷希洛的中途停留进行，让当地学生参观这艘船。直接接触正在工作的海洋学研究船以及巡航后的后续访问将为学生提供一个独特的机会，直接与参与该项目的科学家讨论探险的结果。开发新理解所需的数据集鉴于微量元素输入过程在建立海洋化学分布方面的相对重要性，在 62 天的航行期间，将使用定制设计的采样包在 41 个地点收集整个水体的海水样本。游轮路线的北部起源于地表水中溶解铁浓度极低的地区，限制了植物的生长。 再往南，通过测量地表水中溶解的铝浓度，可以追踪从大陆吹来的矿物尘埃在大气中沉积的增加。 添加这种粉尘还会增加溶解的铁。 来自沿海地区的潜在额外铁输入将通过溶解锰浓度的同时增加来确定。该项目将比较和关联铝、铁和锰的变化，以量化和识别巡航路线上的不同添加过程。通过使用船载流动注射分析为这些微量元素提供近乎实时的测量，有可能修改采样策略以获得最大的科学回报。 船上结果还将有助于识别任何采样污染问题，这些问题是收集这些低含量微量元素时持续存在的风险。 总而言之，对这些基本要素进行船上分析是确保 GEOTRACES PMT 成功的一项重要活动。

项目成果

An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific

北太平洋热液 3He 和溶解铁的中深度来源

• DOI: 10.1016/j.epsl.2020.116223
• 发表时间: 2020-06
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Jenkins, W.J.;Hatta, M.;Fitzsimmons, J.N.;Schlitzer, R.;Lanning, N.T.;Shiller, A.;Buckley, N.R.;German, C.R.;Lott, D.E.;Weiss, G.;et al
• 通讯作者: et al

Major processes of the dissolved cobalt cycle in the North and equatorial Pacific Ocean

北太平洋和赤道太平洋溶解钴循环的主要过程

• DOI: 10.5194/bg-19-2365-2022
• 发表时间: 2022-01
• 期刊: Biogeosciences
• 影响因子: 4.9
• 作者: Chmiel, Rebecca;Lanning, Nathan;Laubach, Allison;Lee, Jong;Fitzsimmons, Jessica;Hatta, Mariko;Jenkins, William;Lam, Phoebe;McIlvin, Matthew;Tagliabue, Alessandro;et al
• 通讯作者: et al

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: 2022-08
• 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;et al
• 通讯作者: et al