Collaborative Research: Seawater Inorganic and Organic Carbon Measurements for the US GEOTRACES Eastern Pacific Zonal Transect

合作研究：美国 GEOTRACES 东太平洋地带样带的海水无机和有机碳测量

• 批准号: 1233706
• 负责人: Nicholas Bates
• 金额: $ 27.21万
• 依托单位: Bermuda Institute of Ocean Sciences (BIOS), Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-02-01 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1233706&HistoricalAwards=false
• 关键词: Collaborative; Research; Seawater; Inorganic; Organic

Scientists from Bermuda Institute of Ocean Sciences and the University of California, Santa Barbara, plan to collect samples during the 2013 GEOTRACES Eastern Pacific Zonal Transect cruise and analyze them for dissolved inorganic carbon, dissolved organic carbon (DOC), and total alkalinity. The resultant data will be highly precise and accurate to allow calculation of pH and seawater carbonate chemistry (e.g., hydroxide, carbonate ion, saturation sate for calcium carbonate minerals). Given the influence of pH on redox chemistry, speciation, and ligand-particle-trace metal/isotope interactions, the transect from Peru to Tahiti with its range of marine seawater carbonate chemistry will provide an opportunity to test the hypotheses that (1) pH is a critical constraint for controlling distributions of trace elements and their isotopes (TEIs) and their dynamics within the water column, and; (2) DOC interacts with TEIs providing a spectrum of binding ligands that influence trace element solubility, complexation, and speciation. Also, because the cruise track will pass over the East Pacific Rise, the scientists plan to evaluate DOC variability within the hydrothermal plume and determine the partitioning of organic matter between DOC and particulate organic carbon. In collaboration with other GEOTRACES researchers, the data will be used to assess the speciation of iron, copper, cobalt and mercury, as well as determine the removal rate of DOC from the surface ocean with the help of chlorofluorocarbon data obtained by a collaborator from the University of Miami, Rosenstiel School of Marine and Atmospheric Science. As regards broader impacts, this project would result in a high quality data set that would benefit not only the GEOTRACES community to help them interpret their trace metal and isotope measurements but other scientists involved in organic/inorganic carbon cycle research as well. One graduate student from the University of California, Santa Barbara would be supported and trained as part of this project.

来自百慕大海洋科学研究所和加州大学圣巴巴拉分校的科学家计划在2013年GEOTRACES东太平洋带状断面巡航期间收集样本，并分析它们的溶解无机碳、溶解有机碳和总碱度。 所得到的数据将是高度精确和准确的，以允许计算pH和海水碳酸盐化学（例如，氢氧化物、碳酸根离子、碳酸钙矿物饱和状态）。 考虑到pH值对氧化还原化学、物种形成和配体-颗粒-痕量金属/同位素相互作用的影响，从秘鲁到塔希提岛的断面及其海洋海水碳酸盐化学范围将提供一个检验以下假设的机会：（1）pH值是控制水体中痕量元素及其同位素（TEI）分布及其动态的关键约束;（2）DOC与TEI相互作用，提供一系列影响微量元素溶解度、络合和形态的结合配体。此外，由于巡航轨迹将经过东太平洋隆起，科学家们计划评估热液羽流中DOC的变化，并确定DOC和颗粒有机碳之间的有机物分配。 与其他GEOTRACES研究人员合作，这些数据将用于评估铁，铜，钴和汞的物种形成，并在迈阿密大学罗森斯蒂尔海洋与大气科学学院合作者获得的氯氟烃数据的帮助下确定DOC从海洋表面的去除率。 至于更广泛的影响，该项目将产生一个高质量的数据集，不仅有利于GEOTRACES社区，帮助他们解释其微量金属和同位素测量，而且也有利于参与有机/无机碳循环研究的其他科学家。 圣巴巴拉的加州大学的一名研究生将得到支助和培训，作为该项目的一部分。