| 项目编号: | 1601224
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| 项目名称: | DISSERTATION RESEARCH: The nexus of observation and modeling of methane emissions from inland water bodies |
| 作者: | Gil Bohrer
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| 承担单位: | Ohio State University
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| 批准年: | 2016
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| 开始日期: | 2016-09-01
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| 结束日期: | 2017-08-31
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| 资助金额: | 19065
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | methane
; wetland
; soil
; atmosphere
; methane gas
; methane flux
; pore-water dialysis peeper
; much methane
; modern methane emission model
; methane production
; wetland methane model
; water column
; total methane flux
; old woman creek national estuary research reserve
; pore water
; methane concentration
; climate modeling
; common methane pathway
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| 英文摘要: | The impacts of climate and wetlands on each other are currently not well understood. While wetland plants consume carbon dioxide from the atmosphere, wetlands also produce methane, a powerful greenhouse gas that influences the global climate. Methane production and its movement within the soils of wetlands results from many simultaneous processes. Microorganisms living in wetland soils where there is no oxygen can produce methane. Methane, being lighter than air, works its way through the soil and can escape into the atmosphere. However, during transport through soils, specialized bacteria can consume methane if the local chemistry is favorable to that process. Additionally, plants can facilitate the movement of methane from soils to the atmosphere. This project will study the transport of methane through wetland vegetation and improve mathematical models of that process. This will be accomplished by developing new measurement techniques that can more accurately predict how much methane is transported through wetland plants. Results from this work will improve our general understanding of how wetlands function with respect to release of methane gas, a potent greenhouse gas important in climate modeling.
Plant transport is perhaps the most complex and least understood of the common methane pathways from the soil to the atmosphere. Moreover, wetlands are frequently comprised of a tight mosaic of land cover types. However, few models currently account for the effects of plant heterogeneity within the wetland on the total methane flux. Plants move methane both through their root aeration system, aerenchymous tissue, and through their xylem and stomata. It has been hypothesized that methane dissolved into the pore water at the plant root zone is mobilized by the plant as it transpires. However, the role of stomatally conducted methane is not clear and is almost always ignored by modern methane emission models. In this project, researchers will design and deploy novel chambers to quantify plant-mediated fluxes of methane from wetlands and use those data to parameterize a general model of the process. The study site for chamber deployment will be the Old Woman Creek National Estuary Research Reserve. These activities are part of a comprehensive measurement campaign involving traditional static chambers to measure diffusive fluxes through the water column, pore-water dialysis peepers, which provide a profile of methane concentrations in the soil, and an eddy-covariance tower, which will provide site level measurements of methane flux into the atmosphere. The plant hydrodynamics model, FETCH2, and a wetland methane model will be coupled to simulate the methane emitted through plants. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/91172
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Gil Bohrer. DISSERTATION RESEARCH: The nexus of observation and modeling of methane emissions from inland water bodies. 2016-01-01.
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