Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes
合作研究:连接寡营养海岸边缘的铁和氮源:固氮和边界通量的作用
基本信息
- 批准号:2326719
- 负责人:
- 金额:$ 54.91万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-03-15 至 2025-04-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
This project will investigate how groundwater discharge delivers important nutrients to the coastal ecosystems of the West Florida Shelf. Preliminary studies indicate that groundwater may supply both dissolved organic nitrogen (DON) and iron in this region. In coastal ecosystems like the West Florida Shelf that have very low nitrate and ammonium concentrations, DON is the main form of nitrogen available to organisms. Nitrogen cycling is strongly affected by iron availability because iron is essential for both photosynthesis and for nitrogen fixation. This study will investigate the sources and composition of DON and iron, and their influence on the coastal ecosystem. The team will sample offshore groundwater wells, river and estuarine waters, and conduct two expeditions across the West Florida Shelf in winter and summer. Investigators will participate in K-12 and outreach activities to increase awareness of the project and related science. The project will fund the work of six graduate and eight undergraduate students across five institutions, furthering NSF’s goals of education and training. Motivated by preliminary observations of unexplained, tightly-correlated DON and dissolved iron concentrations across the West Florida Shelf (WFS), the proposed work will quantify the flux and isotopic signatures of submarine groundwater discharge (SGD)-derived DON and iron to the WFS, and evaluate the bioavailability of this temporally-variable source using four seasonal near-shore campaigns sampling offshore groundwater wells, estuarine, and riverine endmembers and two cross-shelf cruises. The work will evaluate whether SGD stimulates nitrogen fixation on the WFS, and the potential for the stimulated nitrogen fixation to further modify the chemistry of DON and dissolved iron in the region. The cross-shelf cruises will investigate hypothesized periods of maximum SGD and Trichodesmium abundance (June), and reduced river discharge and SGD (February), thus comparing two distinct biogeochemical regimes. The concentrations and isotopic compositions of DON and dissolved iron, molecular composition of DON, and the concentration and composition of iron-binding ligands will be characterized. Nitrogen fixation rates and Trichodesmium spp. abundance and expression of iron stress genes will be measured. Fluxes of DON and iron from SGD and rivers will be quantified with radium isotope mass balances. The impacts of SGD on nitrogen fixation and DON/ligand production will be constrained with incubations of natural phytoplankton communities with submarine groundwater amendments. Two hypotheses will be tested: 1) SGD is the dominant source of bioavailable DON and dissolved iron on the WFS, and 2) SGD-alleviation of iron stress changes the dominant Trichodesmium species on the WFS, increases nitrogen fixation rates and modifies DON and iron composition. Overall, the work will establish connections between marine nitrogen and iron cycling and evaluate the potential for coastal inputs to modify water along the WFS before export to the Atlantic Ocean. This study will thus provide a framework to consider these boundary fluxes in oligotrophic coastal systems and the relative importance of rivers and SGD as sources of nitrogen and iron in other analogous locations, such as coastal systems in Australia, India, and Africa, where nitrogen fixation and SGD have also been documented.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.
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Kristen Buck其他文献
The effect of ocean acidification on Fe speciation across distinct regions of the Eastern North Pacific
海洋酸化对北太平洋东部不同区域铁形态的影响
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
Lise Artigue;Salvatore Caprara;Charles Trick;William P Cochlan;Shigenobu Takeda;Mark Wells;Kristen Buck - 通讯作者:
Kristen Buck
CYSTATIN C IS AN INDEPENDENT RISK PREDICTOR FOR DEATH OR MYOCARDIAL INFARCTION IN PATIENTS WITH ST-ELEVATION MYOCARDIAL INFARCTION (STEMI) AS WELL AS IN NON-ST-ELEVATION ACUTE CORONARY SYNDROME (NSTE-ACS)
- DOI:
10.1016/s0735-1097(11)60999-6 - 发表时间:
2011-04-05 - 期刊:
- 影响因子:
- 作者:
Axel Åkerblom;Lars Wallentin;Agneta Siegbahn;Richard C. Becker;Andrzej Budaj;Kristen Buck;Jay Horrow;Steen Husted;Hugo Katus;Philippe Gabriel Steg;Robert F. Storey;Nils Åsenblad;Stefan K. James - 通讯作者:
Stefan K. James
Kristen Buck的其他文献
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{{ truncateString('Kristen Buck', 18)}}的其他基金
NSFGEO-NERC: Collaborative Research: Using Time-series Field Observations to Constrain an Ocean Iron Model
NSFGEO-NERC:合作研究:利用时间序列现场观测来约束海洋铁模型
- 批准号:
2310573 - 财政年份:2022
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
Collaborative Research: U.S. GEOTRACE GP17-OCE and GP17-ANT: Characterizing iron-binding organic ligands in the Southern Ocean and implications for iron cycling in the global ocean
合作研究:美国 GEOTRACE GP17-OCE 和 GP17-ANT:南大洋铁结合有机配体的特征及其对全球海洋铁循环的影响
- 批准号:
2300915 - 财政年份:2022
- 资助金额:
$ 54.91万 - 项目类别:
Continuing Grant
Collaborative Research: U.S. GEOTRACE GP17-OCE and GP17-ANT: Characterizing iron-binding organic ligands in the Southern Ocean and implications for iron cycling in the global ocean
合作研究:美国 GEOTRACE GP17-OCE 和 GP17-ANT:南大洋铁结合有机配体的特征及其对全球海洋铁循环的影响
- 批准号:
2219551 - 财政年份:2022
- 资助金额:
$ 54.91万 - 项目类别:
Continuing Grant
Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes
合作研究:连接寡营养海岸边缘的铁和氮源:固氮和边界通量的作用
- 批准号:
2148836 - 财政年份:2022
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
Collaborative Research: The Effect of Ocean Acidification on Fe Availability to Phytoplankton in Coastal and Oceanic Waters of the Eastern North Pacific
合作研究:海洋酸化对北太平洋东部沿海和海洋水域浮游植物铁有效性的影响
- 批准号:
1829753 - 财政年份:2019
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
NSFGEO-NERC: Collaborative Research: Using Time-series Field Observations to Constrain an Ocean Iron Model
NSFGEO-NERC:合作研究:利用时间序列现场观测来约束海洋铁模型
- 批准号:
1829777 - 财政年份:2018
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
Collaborative Research: Diatoms, Food Webs and Carbon Export - Leveraging NASA EXPORTS to Test the Role of Diatom Physiology in the Biological Carbon Pump
合作研究:硅藻、食物网和碳输出 - 利用 NASA EXPORTS 测试硅藻生理学在生物碳泵中的作用
- 批准号:
1756433 - 财政年份:2018
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
EAGER: Iron-Virus Interactions in the Ocean
EAGER:海洋中铁与病毒的相互作用
- 批准号:
1722761 - 财政年份:2017
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
Collaborative Research: Investigating Iron-inding Ligands in Southern Ocean Diatom Communities: The Role of Diatom-Bacteria Associations
合作研究:调查南大洋硅藻群落中的铁配体:硅藻-细菌协会的作用
- 批准号:
1443483 - 财政年份:2015
- 资助金额:
$ 54.91万 - 项目类别:
Standard Grant
Collaborative Research: US GEOTRACES Pacific Section: Measurement of the organic complexation of dissolved iron, copper and cobalt, and total dissolved cobalt
合作研究:美国GEOTRACES太平洋部分:溶解铁、铜和钴的有机络合以及总溶解钴的测量
- 批准号:
1441969 - 财政年份:2014
- 资助金额:
$ 54.91万 - 项目类别:
Continuing Grant
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