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到大溪地巡游期间提供溶解的微量元件铝（AL），铁（Fe）和锰（MN）的船上测量值，该杂货将作为美国太平洋子午线子午线式（PMT）的一部分航行。 PMT探险是旨在提高对全球海洋生物地球化学周期的理解的国际地理计划计划的一部分。地表水中微观海洋植物的生长取决于某些微量元素的可用性（尤其是溶解的Fe）。 此外，该和其他微量元素的分布记录了海洋中的当前和过去的化学和生物过程。 PMT巡航轨道包括多种独特的海洋条件，因此工作的结果将为各种全球海洋过程提供重要的见解。为了获得更广泛的科学影响，结果将纳入解决全球过程中海洋当前和未来作用的模型中。评估沿巡航轨道的克拉里木裂裂缝区域中的微量元素的分布还将为该区域提供重要的基线，该区域计划在该地区进行锰结节的海床开采。教育宣传将在夏威夷希洛的中期停留，与当地学生一起参观该船。 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.巡航轨道的北部起源于一个区域，在地表水中溶解的Fe浓度非常低，限制了植物的生长。 除了南部，通过测量地表水中的溶解的Al浓度，可以追溯到从大陆吹出的矿物灰尘的增加的大气沉积。 这种灰尘的添加还增加了溶解的Fe。 通过溶解的MN浓度的同时增加，将确定来自沿海地区的FE的潜在额外投入。该项目将比较和关联AL，FE和MN的变化，以量化和识别沿巡航轨道的不同添加过程。通过使用船坞流动注入分析为这些微量元素提供近乎实时的测量，存在潜在的，以修改采样策略以获得最大的科学回报。 船上的结果还将有助于确定收集这些低级痕量元素时持续风险的任何采样污染问题。 总的来说，这些基本要素的船板分析是确保Geotraces PMT成功的重要活动。

项目成果

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

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

• 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: W. J. Jenkins;M. Hatta;J. Fitzsimmons;R. Schlitzer;N. Lanning;Alan Shiller;N. R. Buckley;C. R. German;D. Lott;G. Weiß;L. Whitmore;K. Casciotti;Phoebe J. Lam;G. Cutter;K. Cahill

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
• 期刊: Biogeosciences
• 影响因子: 4.9
• 作者: Chmiel, Rebecca;Lanning, Nathan;Laubach, Allison;Lee, Jong-Mi;Fitzsimmons, Jessica;Hatta, Mariko;Jenkins, William;Lam, Phoebe;McIlvin, Matthew;Tagliabue, Alessandro
• 通讯作者: Tagliabue, Alessandro