REU: Long-Path FTIR Analysis of Ecosystem Processes Over Varying Landscape and Spatial Scales

REU：对不同景观和空间尺度的生态系统过程进行长程 FTIR 分析

• 批准号: 8918216
• 负责人: Clifford Dahm
• 金额: $ 67.4万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-01 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8918216&HistoricalAwards=false
• 关键词: REU; Long; Path; FTIR; Analysis

Long-path Fourier Transform InfraRed spectroscopy (FTIR) is a very valuable technique for quantifying trace gas concentrations in the near-surface atmosphere. Drs. Gosz, Dahm, and Risser performed path-averaged analyses for CO2, H20, CH4, CO, and N2O over optical path-lengths ranging as far as 1 km and at temporal frequencies as small as 1.5 second intervals. Their research to date has extensively tested the FTIR instrument under field conditions and experimented with various combinations of instrument setups to maximize detection sensitivity for different path-lengths and gases. The instrument is capable of making repeated high resolution analyses of key trace gases in the atmosphere which are strongly influenced by terrestrial and aquatic nutrient and energy cycling processes. This continuation proposal emphasizes how Drs. Gosz, Dahm, and Risser will interface new developments in the field of micrometeorology with long-path FTIR to move ecology to a new level of technological sophistication that permits the examination of key processes and rates of gas fluxes at realistic spatial and temporal scales in the field. The major objectives of this proposal are: 1. Test Scale Theory Relating to Ecosystem Processes. 2. Develop Path-Averaged Meteorological Flux Measurements to Quantify Long-Path Fluxes. 3. Measure Ecosystem Function with Path-Averaged Gaseous Fluxes. This research effort involves interdisciplinary inter- actions with theoretical and experimental micrometeorologists (U.S. Army, NOAA, NCAR), and theoretical and experimental ecosystem scientists. The range of scales that can be studied with the concurrent use of the FTIR and new micrometeorological instrumentation bridges the gap between traditional ecological techniques and emerging macroscale air-craft and satellite- based technologies. A major goal of this proposal is to further develop links between ecological and meteorological measurements at appropriate scales for use in addressing issues of regional and global environmental change. Drs. Gosz, Dahm, and Risser are productive and innovative scientists. Their research program has introduced important new technology to ecosystem research. The institutional support for this research is excellent.

长径傅里叶变换红外光谱（FTIR）是一种非常有价值的近地表大气痕量气体浓度定量技术。Drs。Gosz、Dahm和Risser对CO2、H20、CH4、CO和N2O进行了光程平均分析，光程长度可达1公里，时间间隔小至1.5秒。迄今为止，他们的研究已经在现场条件下对FTIR仪器进行了广泛的测试，并对仪器设置的各种组合进行了实验，以最大限度地提高对不同路径长度和气体的检测灵敏度。该仪器能够对大气中受陆地和水生养分和能量循环过程强烈影响的关键微量气体进行重复高分辨率分析。这个延续提案强调博士如何。Gosz， Dahm和Risser将把微气象学领域的新发展与长路径FTIR结合起来，将生态学推向一个新的技术复杂水平，允许在实际的空间和时间尺度上检查关键过程和气体通量率。本建议的主要目标是：1。与生态系统过程相关的测试尺度理论。发展路径平均气象通量测量，量化长路径通量。用路径平均气体通量测量生态系统功能。这项研究工作涉及与理论和实验微气象学家（美国陆军，NOAA， NCAR）以及理论和实验生态系统科学家的跨学科互动。同时使用FTIR和新型微气象仪器可以研究的尺度范围弥补了传统生态技术与新兴的大尺度飞机和卫星技术之间的差距。这项建议的一个主要目标是进一步发展适当尺度的生态和气象测量之间的联系，以便用于解决区域和全球环境变化问题。Drs。Gosz， Dahm和Risser是富有创造力的科学家。他们的研究项目为生态系统研究引入了重要的新技术。这项研究得到了机构的大力支持。