Fate of Phosphorus during Photochemical Cycling of Iron Oxyhydr(oxides) in the Upper Ocean

上层海洋羟基氧化铁光化学循环过程中磷的归宿

• 批准号: 1416894
• 负责人: Kathleen Ruttenberg
• 金额: $ 15万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-03-01 至 2018-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1416894&HistoricalAwards=false
• 关键词: Fate; Phosphorus; during; Photochemical; Cycling

Terrestrially-derived dust is an important source of the micronutrient iron (Fe) to nutrient-depleted regions of the oceans. The Fe from aeolian inputs is predominantly in the form of ferric oxyhydroxide which because of its strong affinity for phosphorus (P) have significant amounts of this nutrient associated with it. Together these nutrients can impact primary production. Once dust is introduced to sunlit surface waters, the ferric oxyhydroxide particles are subject to photoreductive dissolution which enhances bioavailable Fe but the impact of this process on the associated P is unknown. Researchers at the University of Hawaii plan to carry out a series of laboratory experiments using synthetic ferric oxyhydroxides and natural dust samples to determine the fate of P associated with these particles once they are photochemically reduced. Results from this study will establish whether Fe-rich dust is a source to the existing bioavailable pool of P or a sink due to removal via sorptive scavenging as a consequence of repetitive photochemical dissolution/re-precipitation cycles of ferric oxyhydroxides in the marine environment. Broader Impacts: Besides providing new insights on the phosphorus cycle, this research would support and train one graduate student of Hawaiian descent.

陆源性灰尘是海洋养分耗尽区域的微量营养素铁（FE）的重要来源。 来自风烟输入的Fe主要是氧化铁氧化铁的形式，由于其对磷（P）具有很强的亲和力（P）具有与之相关的大量养分。 这些营养素在一起会影响初级生产。 一旦将灰尘引入阳光地表水，含氧羟基颗粒将受到光降低的溶解，从而增强了生物利用Fe，但是该过程对相关P的影响尚不清楚。 夏威夷大学的研究人员计划使用合成铁氧化铁和天然灰尘样品进行一系列实验室实验，以确定一旦光化学降低了这些颗粒的P的命运。 这项研究的结果将确定，由于重复的光化学溶解/重复的光化学溶解/重新凝结周期，由于在海洋环境中重复的光化学溶解/重新凝聚周期而导致通过刺激性清除而导致现有生物利用P或水槽的来源。 更广泛的影响：除了提供有关磷周期的新见解外，这项研究还将支持并培训一名夏威夷血统的研究生。