GEOTRACES Zonal Atlantic Section: Arsenic and phosphorus biogeochemistry

GEOTRACES 大西洋分区：砷和磷生物地球化学

• 批准号: 0929537
• 负责人: Gregory Cutter
• 金额: $ 29.62万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-03-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0929537&HistoricalAwards=false
• 关键词: GEOTRACES; Zonal; Atlantic; Section; Arsenic

GEOTRACES is a newly initiated international oceanographic program to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the oceans and to establish an understanding of the sensitivity of these distributions to changing environmental conditions. A scientist from Old Dominion University plans to participate in the 2010 North Atlantic GEOTRACES cruise to collect and analyze samples for arsenic and phosphorus with the goal of quantifying the biogeochemical linkages between these two elements. The specific research objectives are the following: (1) establish the correlations between measured dissolved arsenate:phosphate ratios and the concentrations of arsenite, monomethyl-arsenic, and dimethyl-arsenic; (2) quantify the surface water residence times of arsenite, monomethyl-arsenic, and dimethyl- arsenic with respect to photo-oxidation and demethylation; (3) evaluate the efficacy of using the concentrations of arsenite, monmethyl-arsenic, and/or dimethyl-arsenic as proxies for phosphate stress; and (4) construct a biogeochemical budget for dissolved As in the North Atlantic that will allow the effect of P on As cycling to be quantified. As regards broader impacts, one postdoc and one undergraduate student will be supported and trained as part of this project.

GEOTRACES是一个新发起的国际海洋学计划，旨在确定控制海洋中关键微量元素和同位素分布的过程和量化通量，并了解这些分布对不断变化的环境条件的敏感性。 来自Old自治领大学的一名科学家计划参加2010年北大西洋GEOTRACES巡航，收集和分析砷和磷的样本，目的是量化这两种元素之间的地球化学联系。 具体的研究目标如下：（1）建立测定的溶解态砷酸盐/磷酸盐比值与亚砷酸盐、一甲基砷和二甲基砷浓度之间的相关性：（2）量化亚砷酸盐、一甲基砷和二甲基砷在地表水中的光氧化和脱甲基作用的停留时间;（3）评价亚砷酸盐、一甲基砷和/或二甲基砷浓度作为磷胁迫指标的有效性;（4）建立北大西洋溶解态As的生态地球化学收支模型，以量化P对As循环的影响。 至于更广泛的影响，一名博士后和一名本科生将得到支持和培训，作为该项目的一部分。