Evaluating Oceanic Nitrogen Fixation using Spatial Variations in the Natural Isotopic Composition of Nitrate in the Subsurface Waters of the Subtropical N. Atlantic

利用副热带北大西洋次表层水中硝酸盐天然同位素组成的空间变化评估海洋固氮

• 批准号: 9902450
• 负责人: Mark Altabet
• 金额: $ 19万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902450&HistoricalAwards=false
• 关键词: Evaluating; Oceanic; Nitrogen; Fixation; using

ABSTRACT OCE-9902450Recent studies have suggested that nitrogen fixation may play a central role in controlling the oceanic inventory of combined nitrogen, primarily nitrogen in the form of dissolved nitrate in the deep ocean. As a macronutrient limiting primary production in much of the ocean, nitrogen not only plays a critical role in maintaining the ecology of the sea but also in regulating the capacity of the ocean to drawn down atmospheric carbon dioxide and fix it into organic form. In this study, the PIs will use the isotopic composition of nitrate to evaluate and quantify the importance of N2 fixation in supplying combined nitrogen to the oligotrohpic central North Atlantic. This isotopic approach will complement ongoing efforts to measure the rates of oceanic nitrogen fixation directly.

摘要OCE-9902450的研究表明，氮固定可能在控制氮组合的海洋清单中起着核心作用，主要是以溶解的硝酸盐形式在深海中溶解的氮。 作为大部分海洋中原发性生产的大量营养素，氮不仅在维持海洋生态学方面起着至关重要的作用，而且在调节海洋能够将大气二氧化碳降低并将其固定为有机形式方面也起着至关重要的作用。 在这项研究中，PIS将使用硝酸盐的同位素组成来评估和量化N2固定在向北大西洋中部寡头氮供应合并的氮中的重要性。 这种同位素方法将补充持续的努力，以直接衡量海洋氮的固定速率。