GEOTRACES Pacific Section: Surface Sampling with the GeoFish and Dissolved Trace Metals on the Peru to East Pacific Rise Section

南太平洋的痕量金属数据很少，东热带南太平洋的数据即使有也很有限。 因此，2013年美国GEOTRACES巡航沿着热带南太平洋东部的一个带状部分将有助于填补这一空白。加利福尼亚大学圣克鲁斯分校的一名科学家计划确定秘鲁和东太平洋海隆之间的一套微量金属的分布情况，以研究以下因素的影响：（1）与秘鲁沿海涌升区有关的生产力和粒子通量的横向梯度很大，以及来自大陆边的输入，（2）热带南太平洋东部秘鲁外海强烈而广泛的氧气最小区（OMZ）。待测定的关键痕量金属是溶解的铁、锰、铜、锌、镉和铅，以及镍、钴、镓、钇、钛和镧。 还将对样本子集进行银分析。 除了这些元素的垂直剖面外，在航行期间还将使用GeoFish采样系统收集地表水样本，以分析同一套元素。 这位科学家还将与GEOTRACES项目的合作者一起参加各种相互比较的活动，以确保上述痕量金属的数据质量，为每个垂直站的其他研究人员收集未受污染的样本，并向任何需要表面样本的人提供GeoFish样本管。 更广泛的影响：在GEOTRACES合作者以及海洋科学教育中心的帮助下，研究人员计划创建一个由五部分组成的网络研讨会系列，概述该计划的目标和意义，并突出介绍有关GEOTRACES东太平洋带状断面的故事。 研究人员和他的技术人员还将继续为美国和国外的海洋科学痕量金属界提供GEOTRACES.和SAFe参考样本，以确保数据质量，并更新共识痕量金属值。 作为该项目的一部分，将支持和培训一名博士后。

There is a paucity of data for trace metals in the South Pacific Ocean and limited, if any, data is available for the eastern tropical South Pacific. As such, the U.S. GEOTRACES cruise in 2013 along a zonal section in the eastern tropical South Pacific will help fill this void. A scientist from the University of California-Santa Cruz plans to determine the distributions of a suite of trace metals between Peru and the East Pacific Rise to examine the influence of (1) the large lateral gradient in productivity and particle flux related to the coastal upwelling region off Peru and inputs from the continental margin, and (2) the intense and extensive oxygen minimum zone (OMZ) in the eastern tropical South Pacific off Peru. The key trace metals to be determined are dissolved iron, manganese, copper, zinc, cadmium, and lead, as well as nickel, cobalt, gallium, yttrium, titanium, and lanthanum. A subset of the samples will also be analyzed for silver. Besides the vertical profiles for these elements, the GeoFish sampling system will be used during the cruise to collect surface water samples that will be analyzed for the same suite of elements. The scientist will also participate in various intercomparison exercises with collaborators on the GEOTRACES program to ensure data quality for trace metals mentioned above, collect uncontaminated samples for other researchers at each of the vertical stations, and make the GeoFish sample tubing available to anyone requiring surface samples. Broader Impacts: With the help of GEOTRACES collaborators, as well as the Centers for Ocean Science Education Excellence-Ocean Science, the researcher plans to create a five part webinar series that outlines the goals and significance of the program, as well as highlight stories about the GEOTRACES Eastern Pacific Zonal Transect. The researcher and his technician also would continue to supply the ocean sciences trace metals community both in the U.S. and abroad with GEOTRACES.and SAFe reference samples to ensure data quality, as well as update the consensus trace metal values. One postdoc would be supported and trained as part of this project.