US JGOFS Equatorial Pacific Studies on Iron Deficiency

美国 JGOFS 赤道太平洋缺铁研究

• 批准号: 9022295
• 负责人: Kenneth Johnson
• 金额: $ 43.07万
• 依托单位: San Jose State University Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-15 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9022295&HistoricalAwards=false
• 关键词: US; JGOFS; Equatorial; Pacific; Studies

This research will test the hypothesis that phytoplankton growth in the central equatorial Pacific is limited by a deficiency of iron that results from the very low input of iron-rich atmospheric dust in this area far removed from terrestrial dust sources. It is estimated that the phytoplankton only have 10-20% of the iron they need to fully utilize the nitrate and phosphate upwelling to the surface; hence the potential productivity of a billion tons of C per year is far from being realized. Dissolved and particulate iron in the water column will be measured in which effects on chlorophyll synthesis and nitrate will uptake will be observed with and without added iron. This effort will also provide support to the overall U.S. JGOFS Equatorial Pacific Study by providing clean water and containers to others testing alternative hypotheses. Samples will be collected for measurements of dissolved organic C and N using high temperature catalytic oxidation techniques.

这项研究将验证一个假设，即赤道太平洋中部浮游植物的生长受到铁缺乏的限制，铁缺乏是由于该地区富含铁的大气粉尘输入非常少，远离陆地粉尘来源。据估计，浮游植物只有10-20%的铁，它们需要充分利用上涌到水面的硝酸盐和磷酸盐；因此，每年10亿吨碳的潜在生产力远未实现。将测量水柱中的溶解铁和颗粒铁，观察是否添加铁对叶绿素合成和硝酸盐吸收的影响。这项工作还将通过向其他测试替代假设的人提供清洁水和容器，为美国JGOFS的整个赤道太平洋研究提供支持。将收集样品，使用高温催化氧化技术测量溶解的有机C和N。