Quantifying Iron Turnover in the Upper Ocean via Time-series Measurements at Station ALOHA
通过 ALOHA 站的时间序列测量量化上层海洋的铁周转率
基本信息
- 批准号:2022969
- 负责人:
- 金额:$ 46.02万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2020
- 资助国家:美国
- 起止时间:2020-09-01 至 2024-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Phytoplankton are the base of marine food webs but their ability to grow in the open ocean by photosynthesis is limited by the scarcity of key nutrients especially iron. To understand how phytoplankton respond to global environmental changes, it is essential to predict how the nutrient content of seawater will change as well. Iron is essential to the light-harvesting machinery of phytoplankton but is an extremely small fraction of seawater (1 part per billion) . Iron is much more abundant in soils and when dust storms blow these soils out to sea, the iron content of seawater increases. It is unknown how long the effects of these iron supply events last, which depends on how well the marine ecosystem can recover and reuse iron before it sinks to the seafloor. It is also unknown if human activities have added to the natural Fe supply. The proposed research will address these questions by conducting a 3 year time-series of iron measurements in the North Pacific Ocean. Here, dust supply from Asia occurs mainly during spring, allowing the loss of iron over the summer and fall months to be documented. Unique chemical signatures will be used to distinguish iron supply from the deposition of desert dust or from human sources. This record of the marine iron cycle will be important for validating ecosystem models that are used to predict how climate change will influence the growth of phytoplankton in the future. The research would make a scientific contribution to the Hawaii Ocean Time-Series, help improve biogeochemical iron models, student training at the graduate and undergraduate level, and support an early career scientist. A 3 year time-series of iron (Fe) measurements is proposed to constrain the magnitude of external Fe input and Fe recycling in the open ocean. Near-monthly observations will be conducted in the North Pacific Subtropical Gyre onboard Hawaii Ocean Timeseries cruises, which receives regular dust input during springtime and is minimally influenced by deep mixing. Water column profiling of dissolved and particulate Fe concentrations – combined with the flux of Fe recorded in trace-metal-clean sediment traps – will define a residence time of Fe in the upper water column. Iron uptake rates will be quantified through short-term incubations using a novel stable isotope technique and will be used to derive a turnover time with respect to biological uptake. Finally, the isotopic composition of dissolved and particulate Fe in the mixed layer will be measured to evaluate the potential importance of anthropogenic and Hawaiian Fe sources, which are poorly constrained. Together, these measurements will define the tempo and variability of the open ocean Fe cycle and provide a means to validate models that simulate the biogeochemistry of this key micronutrient.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
浮游植物是海洋食物网的基础,但由于缺乏关键的营养物质,特别是铁,它们通过光合作用在开阔的海洋中生长的能力受到限制。为了了解浮游植物如何对全球环境变化做出反应,预测海水中的营养成分也将如何变化是至关重要的。铁对于浮游植物的捕光机制是必不可少的,但在海水中的比例极小(十亿分之一)。土壤中的铁含量要丰富得多,当沙尘暴将这些土壤吹到海里时,海水中的铁含量就会增加。目前尚不清楚这些铁供应事件的影响会持续多久,这取决于海洋生态系统在铁沉入海底之前能够恢复和再利用的程度。也不知道人类活动是否增加了天然铁的供应。拟议的研究将通过在北太平洋进行为期3年的铁测量来解决这些问题。在这里,来自亚洲的尘埃供应主要发生在春季,从而记录了夏季和秋季的铁损失。独特的化学特征将被用来区分铁的供应,从沉积的沙漠灰尘或从人类来源。海洋铁循环的这一记录对于验证用于预测气候变化将如何影响未来浮游植物生长的生态系统模型至关重要。 这项研究将为夏威夷海洋时间序列做出科学贡献,有助于改进地球化学铁模型,提高研究生和本科生的培训水平,并支持早期的职业科学家。 提出了一个3年的时间序列的铁(Fe)测量,以约束的外部铁输入和铁循环在公海的幅度。将在夏威夷海洋时间系列游轮上的北太平洋副热带环流进行近月观测,该游轮在春季定期接收尘埃输入,受深层混合的影响最小。溶解和颗粒铁浓度的水柱剖面-结合微量金属清洁沉积物捕集器中记录的铁通量-将确定铁在上层水柱中的停留时间。将使用新型稳定同位素技术通过短期孵育对铁摄取率进行定量,并将其用于推导生物摄取的周转时间。最后,溶解和颗粒铁在混合层的同位素组成将被测量,以评估潜在的重要性,人为和夏威夷的铁源,这是不好的约束。总之,这些测量将确定开放海洋铁循环的克里思和变化,并提供一种手段来验证模型,模拟这种关键微量营养素的地球化学。该奖项反映了NSF的法定使命,并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Recycling of dissolved iron in the North Pacific Subtropical Gyre
- DOI:10.1002/lno.12212
- 发表时间:2022-09
- 期刊:
- 影响因子:4.5
- 作者:N. Hawco;Shun‐Chung Yang;P. Pinedo‐González;Erin E. Black;J. Kenyon;S. Ferrón;X. Bian;S. John
- 通讯作者:N. Hawco;Shun‐Chung Yang;P. Pinedo‐González;Erin E. Black;J. Kenyon;S. Ferrón;X. Bian;S. John
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Nicholas Hawco其他文献
Nicholas Hawco的其他文献
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{{ truncateString('Nicholas Hawco', 18)}}的其他基金
ANT LIA: Collaborative Research: Adaptations of Southern Ocean Diatoms to Manganese Scarcity: Can Physiological Ingenuity Overcome Unfavorable Chemistry?
ANT LIA:合作研究:南大洋硅藻对锰稀缺的适应:生理学的独创性能否克服不利的化学因素?
- 批准号:
2149070 - 财政年份:2023
- 资助金额:
$ 46.02万 - 项目类别:
Standard Grant
US GEOTRACES GP17-OCE and GP17-ANT: Mapping zinc speciation in the Southern Ocean overturning circulation to test the zinc scavenging hypothesis
美国 GEOTRACES GP17-OCE 和 GP17-ANT:绘制南大洋翻转环流中的锌形态图,以检验锌清除假说
- 批准号:
2049151 - 财政年份:2021
- 资助金额:
$ 46.02万 - 项目类别:
Standard Grant
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