Infra-red gas analyzer

红外气体分析仪

• 批准号: 407785-2011
• 负责人: Wilson, John
• 金额: $ 2.12万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=472718
• 关键词: Infra; red; gas; analyzer

I request funds to purchase a LICOR 7000 closed path differential infra-red gas analyzer (LI-7000), an LI-610 dewpoint calibrator, and a Campbell Scientific data logger (CR-3000). These instruments will be used in a project whose aim is to measure the relative effectiveness of turbulent eddies in transporting momentum, water vapour and carbon dioxide to and from the surface. The mean rates of transport of these properties are called "fluxes," and corresponding to the fluxes there are mean vertical gradients in the associated properties - for example, during daytime over moist ground the mean water vapour flux is normally directed upward to the drier air aloft, thus, there is a vertical gradient in mean humidity. Present day weather and climate prediction models, as well as many other types of environmental model, require a specification of the "mixing" (or "exchange") coefficients K, Kw, Kc for (respectively) momentum, vapour and carbon dioxide. Unfortunately however, these values are not well known. In many studies, and notwithstanding existing evidence to the contrary, it is assumed ratios of these properties are (a) independent of the state of the atmosphere (i.e. universal); (b) independent of position; and (c) equal to 1.0.

我申请资金购买一台LICOR 7000闭合路径差分红外气体分析仪（LI-7000）、一台LI-610露点校准器和一台坎贝尔科学数据记录仪（CR-3000）。这些仪器将用于一个项目，该项目的目的是测量湍流涡旋在将动量、水蒸气和二氧化碳输送到地表和从地表输送出去方面的相对效力。这些特性的平均传输速率称为“通量”，与通量相对应的是相关特性的平均垂直梯度-例如，在潮湿地面的白天，平均水汽通量通常向上指向高空的干燥空气，因此，平均湿度存在垂直梯度。目前的天气和气候预测模型以及许多其他类型的环境模型都要求（分别）对动量、蒸气和二氧化碳的“混合”（或“交换”）系数K、Kw、Kc作出具体说明。但不幸的是，这些价值并不为人所知。在许多研究中，尽管存在相反的证据，但假设这些性质的比率是（a）与大气的状态无关（即普遍的）;（B）与位置无关;（c）等于1.0。