Collaborative Research: US GEOTRACES Pacific Section-Shipboard Al, Mn and Fe

合作研究：美国GEOTRACES太平洋剖面-船载铝、锰和铁

• 批准号: 1237034
• 负责人: Peter Sedwick
• 金额: $ 17.3万
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1237034&HistoricalAwards=false
• 关键词: Collaborative; Research; US; GEOTRACES; Pacific

The 2013 GEOTRACES Eastern Pacific Zonal transect cruise will transit from the highly productive coastal upwelling region off Peru to the stratified oligotrophic waters of the South Pacific subtropical gyre on its way to Tahiti. A range of subsurface oxygen depleted water and sedimentary inputs from the Peru margin will be encountered, as well as hydrothermal vents at 15°S on the East Pacific Rise (EPR). Scientists from the University of Washington and Old Dominion University plan to analyze seawater samples for dissolved and total-dissolvable aluminum (Al), manganese (Mn), and iron (Fe) in water column samples. The dissolved Al, Mn, and Fe in samples from the upper water column (1000 m depth) will be analyzed onboard to ensure samples being collected are uncontaminated, as well as samples from west of the EPR at hydrothermal plume depths. The shipboard analyses will be augmented by shore-based analyses of water column samples from all depths, as well as analyses of total-dissolvable Al, Mn, and Fe, which will complement the direct analyses of particulate metals undertaken by other GEOTRACES investigators. Results will be used to test the following hypotheses concerning the sources and cycling of Al, Mn and Fe in the ocean: (1) when Aeolian inputs are relatively constant, dissolved Al concentrations in surface waters vary as a function of biological production; (2) concentration maxima of dissolved Al, Mn, and Fe in subsurface waters of the Eastern Pacific oxygen minimum zone are the result of lateral transport from the continental margin by means of resuspension and remobilization; and (3) values about ambient levels with conservative behavior will be encountered in the neutrally buoyant plume about the East Pacific Rise ridge crest for dissolved Fe and Al. As regards broader impacts, results from the study would be disseminated to the public via lectures, the internet, and press releases. One graduate and one undergraduate student from the University of Washington would be supported and trained as part of this project.

2013 GEOTRACES 东太平洋分区横断面航行将从秘鲁附近高产的沿海上升流区域前往南太平洋副热带环流的分层贫营养水域，然后前往塔希提岛。一系列来自秘鲁边缘的地下贫氧水和沉积物输入。将会遇到，以及来自华盛顿大学和老科学家的东太平洋海隆 (EPR) 南纬 15° 的热液喷口。道明尼恩大学计划分析海水样品中水柱样品中溶解和总溶解的铝 (Al)、锰 (Mn) 和铁 (Fe) 上部水柱样品中溶解的铝 (Al)、锰 (Mn) 和铁 (Fe) (1000)。米深度）将在船上进行分析，以确保收集的样本不受污染，以及来自 EPR 西部热液羽流深度的样本，船上分析将通过岸基水柱分析得到加强。来自所有深度的样品，以及对总可溶性铝、锰和铁的分析，这将补充其他 GEOTRACES 研究人员对颗粒金属的直接分析，结果将用于检验以下有关金属来源和循环的假设。海洋中的铝、锰和铁：（1）当风输入相对恒定时，地表水中溶解的铝浓度随着生物生产的变化而变化；（2）地下水中溶解的铝、锰和铁的浓度最大值；东太平洋氧气最低区的值是通过再悬浮和再流动从大陆边缘横向输送的结果；(3) 在东太平洋隆起的中性浮力羽流中将遇到具有保守行为的环境水平值；至于更广泛的影响，研究结果将通过讲座、互联网和新闻稿向公众传播，华盛顿大学的一名研究生和一名本科生将得到支持和培训。部分这个项目的。