Quantitative Study of SO2 and Reactive Halogen Chemistry in Volcanic Plumes by Imaging with a Novel Fabry-Pérot Camera Technique

通过新型法布里-珀罗相机技术成像定量研究火山羽流中的 SO2 和活性卤素化学

• 批准号: 399112922
• 负责人: Professor Dr. Ulrich Platt
• 金额: --
• 依托单位: Institut für Umweltphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/399112922?language=en
• 关键词: Quantitative; Study; SO2; Reactive; Halogen

Imaging two dimensional (2D) distributions of volcanic gases with high time resolution (i.e. at time scales of seconds), allows to study processes which are not accessible to traditional scanning methods. These include: (1) to directly visualize transport and turbulent mixing processes at their intrinsic time scales and (2) to study chemical transformation (e.g. the formation ob BrO) in real time. Moreover, (3) spatial gradients of trace gases (e.g. of BrO and OClO) and their evolution in the plume can be analyzed, which allows to infer details of chemical processes.At present 2D imaging is possible only for volcanic SO2 by using devices which have become known as “SO2 cameras”. They rely on relating images acquired in two narrow wavelengths regions (defined by interference filters). While the introduction of SO2 cameras in recent years marked are a major breakthrough in volcanic gas research they are not applicable to other volcanic gases and also suffer from cross interferences, e.g. to volcanic aerosol.Here we propose the development and application of a novel, Fabry-Perot Interferometer (FPI) – based imaging technique capable of recording the spatial distributions of several important volcanic gases at high time resolution and virtually without interference. We already demonstrated its practical applicability for SO2 and showed that the technique has the sensitivity and specificity to also image BrO and OClO in volcanic plumes. Within the proposed project we intent to build practical devices for the imaging of these three gases and to apply the instruments to studies of the evolution of halogen radical concentrations. This will be done for quiescent degassing as well as for explosive plumes. The intended studies are not possible with any other known technique. In addition, the work proposed here will form the basis to apply the FPI technique to a range of further atmospheric gases (e.g. IO, NO2, CH2O) in the future.

成像具有较高时间分辨率的火山气体（即在秒的时间尺度上）的二维分布（2D），可以研究传统扫描方法无法访问的过程。其中包括：（1）直接在其内在的时间尺度上直接可视化运输和湍流混合过程，以及（2）实时研究化学转化（例如形成OB BRO）。此外，（3）痕量气体的空间梯度（例如，BRO和OCLO）及其在羽流中的演变可以分析，这允许推断化学过程的细节。在当前的2D成像中，仅通过使用已被称为“ SO2摄像机”的设备，才有可能用于火山SO2。他们依赖于在两个狭窄的波长区域中获取的图像（由干扰过滤器定义）。尽管近年来引入SO2摄像机是火山天然气研究中的一个重大突破，但它们不适用于其他火山气体。并且还遭受交叉相互作用的困扰，例如在这里，我们提出了一种新型Fabry-Perot干涉仪（FPI）的开发和应用 - 基于基于成像技术，能够记录高空分辨率和实际上没有干扰的几种重要火山气体的空间分布。我们已经证明了其对SO2的实际适用性，并表明该技术具有对火山羽流中的Bro和Oclo的敏感性和特异性。在拟议的项目中，我们打算为这三种气体的成像构建实用设备，并将工具应用于卤素自由基浓度进化的研究。这将用于静止脱水和爆炸性羽毛。此外，此处提出的工作将构成将FPI技术应用于一系列进一步的大气气体（例如IO，NO2，CH2O）的基础。