Development of a Laser-Induced Fluorescence Ground-Based Instrument for Measurements of Atmospheric Iodine Monoxide

开发用于测量大气一氧化碘的激光诱导荧光地面仪器

• 批准号: 0733875
• 负责人: James Anderson
• 金额: $ 61.5万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0733875&HistoricalAwards=false
• 关键词: Development; Laser; Induced; Fluorescence; Ground

The trace atmospheric free radical species, iodine monoxide (IO), is thought to be a key photochemical constituent in the marine boundary layer where it participates in ozone depletion reactions. It is also implicated in mercury removal processes occurring in the polar spring, and may take part in the formation of marine aerosols. Its potential reactivity with other radical families(NOx and HOx cycles), further underline its elusive reactivity in global photochemical processes in both the troposphere and stratosphere. However, its concentration and distribution over time and space are notably under-observed.Instrumentation emplying laser-induced fluorescence spectroscopy, intended for either ground based or airborne use, will be constructed and implemented to have an estimated detection limit of 0.1 ppt per second or better. As well as presenting a challenging detection threshold, this fast response sensor is needed to resolve the expected highly inhomogeneous distribution of IO in marine boundary layers and other parts of the atmosphere.

微量大气自由基碘（IO）被认为是海洋边界层中参与臭氧消耗反应的关键光化学成分。它还涉及极地春季发生的汞去除过程，并可能参与海洋气溶胶的形成。它与其他自由基族（NOx和HOx循环）的潜在反应性进一步强调了它在对流层和平流层中全球光化学过程中难以捉摸的反应性。然而，其浓度和随时间和空间的分布明显缺乏观察。将建造和实施用于地面或空中使用的激光诱导荧光光谱仪器，其估计检测限为每秒0.1 ppt或更高。除了具有挑战性的检测阈值外，还需要这种快速响应传感器来解决海洋边界层和大气其他部分IO的预期高度不均匀分布。