| DOI: | 10.2172/1088843
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| 报告号: | FG02-02ER63431 Final Report
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| 报告题名: | Final Activity Report: The Effects of Iron Complexing Ligands on the Long Term Ecosystem Response to Iron Enrichment of HNLC waters |
| 作者: | Trick, Charles Gordon [Western University]
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| 出版年: | 2013
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| 发表日期: | 2013-07-30
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Iron
; ocean carbon sequestration
; toxins
; ligands
; ocean fetrilization
|
| 中文主题词: | 碳
; 铁
|
| 主题词: | CARBON
; IRON
|
| 英文摘要: | Substantial increases in the concentrations of the stronger of two Fe(III) complexing organic ligand classes measured during the mesoscale Fe enrichment studies IronEx II and SOIREE appeared to sharply curtailed Fe availability to diatoms and thus limited the efficiency of carbon sequestration to the deep. Detailed observations during IronEx II (equatorial Pacific Ocean) and SOIREE (Southern Ocean âPacific sector) indicate that the diatoms began re-experiencing Fe stress even though dissolved Fe concentrations remained elevated in the patch. This surprising outcome likely is related to the observed increased concentrations of strong Fe(III)-complexing ligands in seawater. Preliminary findings from other studies indicate that diatoms may not readily obtain Fe from these chemical species whereas Fe bound by strong ligands appears to support growth of cyanobacteria and nanoflagellates. The difficulty in assessing the likelihood of these changes with in-situ mesoscale experiments is the extended monitoring period needed to capture the long-term trajectory of the carbon cycle. A more detailed understanding of Fe complexing ligand effects on long-term ecosystem structure and carbon cycling is essential to ascertain not only the effect of Fe enrichment on short-term carbon sequestration in the oceans, but also the potential effect of Fe enrichment in modifying ecosystem structure and trajectory. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1088843
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/41053
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1088843.pdf（155KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Trick, Charles Gordon [Western University]. Final Activity Report: The Effects of Iron Complexing Ligands on the Long Term Ecosystem Response to Iron Enrichment of HNLC waters. 2013-01-01.
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