Collaborative Research: Determination of Nitrous Acid and Nitrogen Dioxide Flux and Concentration Over Forest Canopies Using Quantum Cascade Laser Absorption Spectroscopy
合作研究:使用量子级联激光吸收光谱法测定森林冠层的亚硝酸和二氧化氮通量和浓度
基本信息
- 批准号:0813617
- 负责人:
- 金额:$ 20.62万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2008
- 资助国家:美国
- 起止时间:2008-07-15 至 2012-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The production and loss mechanisms, and the magnitude of nitrous acid (HONO) fluxes to the atmosphere, will be investigated by constructing improved instrumentation capable of fast response measurements suitable for eddy-covariance flux, and by deploying the new sensor to field test it by making detailed measurements of HONO concentrations and fluxes and their covariance with other nitrogen oxides, oxidants, and environmental conditions. Photolysis of nitrous acid (HONO) is a major source of OH radicals in the boundary layer but poorly understood. The PI's will (1) construct and test a 2-channel Quantum-Cascade laser absorption spectrometer (QCLAS) capable of high frequency measurement of HONO and NO2, (2) measure HONO, NO, NO2, and NOy at a suburban site influenced by vehicle emissions, and above a forest canopy at a rural site, and (3) interpret the concentration and flux observations within a photochemical model framework, based on GEOS-Chem, to provide new insights into the processes controlling HONO in the boundary layer. These research activities will enhance existing research infrastructure by providing instrument development and supporting research partnerships. The instrument addresses a critical societal need for a reliable fast-response instrument to measure HONO in continuous operation to assess pollution impacts. The HONO-NO2 QCLAS will enable participation in a variety of future field measurement campaigns to examine HONO production and loss. This work will directly support a graduate-student thesis project and will serve as a research topic for two undergraduate students and a high school teacher at the Harvard Forest LTER as part of Research Experience for Undergraduates (REU) program and Research Experience for Teachers (RET) summer programs.
的生产和损失机制,以及亚硝酸(HONO)通量的大小,将通过构建改进的仪器能够快速响应测量适合涡动协方差通量,并通过部署新的传感器进行现场测试,通过详细测量HONO浓度和通量及其与其他氮氧化物,氧化剂和环境条件的协方差。亚硝酸的光解(HONO)是边界层中OH自由基的主要来源,但了解甚少。PI将(1)构建并测试能够高频测量HONO和NO2的双通道量子级联激光吸收光谱仪(QCLAS),(2)在受车辆排放影响的郊区和农村森林树冠上方测量HONO、NO、NO2和NOy,以及(3)在光化学模型框架内解释浓度和通量观测结果。基于GEOS-Chem,为边界层中HONO的控制过程提供新的见解。这些研究活动将通过提供仪器开发和支持研究合作伙伴关系来增强现有的研究基础设施。 该仪器满足了社会对可靠的快速反应仪器的关键需求,以测量持续运行的HONO,以评估污染影响。 HONO-NO2 QCLAS将使参与各种未来的现场测量活动,以检查HONO的产生和损失。 这项工作将直接支持研究生论文项目,并将作为研究课题的两名本科生和一名高中教师在哈佛森林LTER作为研究经验的本科生(REU)计划和研究经验的教师(RET)暑期课程的一部分。
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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Mark Zahniser其他文献
Mark Zahniser的其他文献
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{{ truncateString('Mark Zahniser', 18)}}的其他基金
Collaborative Research: Measurements of Gaseous Nitric Acid, Nitrogen Dioxide, and Atmospheric Nitrogen Deposition Fluxes in Two Mixed-Hardwood Forests
合作研究:测量两片混合阔叶林中的气态硝酸、二氧化氮和大气氮沉积通量
- 批准号:
9981282 - 财政年份:2000
- 资助金额:
$ 20.62万 - 项目类别:
Standard Grant
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SBIR 第二阶段:清洁对流层二氧化氮探测器
- 批准号:
9627217 - 财政年份:1996
- 资助金额:
$ 20.62万 - 项目类别:
Standard Grant
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用于清洁对流层的二氧化氮探测器
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9460987 - 财政年份:1995
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$ 20.62万 - 项目类别:
Standard Grant
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$ 20.62万 - 项目类别:
Standard Grant
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8921116 - 财政年份:1990
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$ 20.62万 - 项目类别:
Standard Grant
Atmospheric Trace Gas Flux Meter Using Tunable Diode Lasers
使用可调谐二极管激光器的大气痕量气体通量计
- 批准号:
8907681 - 财政年份:1989
- 资助金额:
$ 20.62万 - 项目类别:
Standard Grant
Atmospheric Trace Gas Flux Meter Using Tunable Diode Lasers
使用可调谐二极管激光器的大气痕量气体通量计
- 批准号:
8760686 - 财政年份:1988
- 资助金额:
$ 20.62万 - 项目类别:
Standard Grant
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