Analysis of spectroscopic long-term volcanic emissions of SO2 and BrO data with respect to underlying geophysical processes.

火山喷出的气体成分和总流量为火山内部的过程提供了指示。排放气体通量的变化可以是预测喷发的一个额外工具（除地震、变形等工具外）。除了释放的气体总量之外，不同气体的相对丰度也可以指示某些类型的火山活动。这项建议的核心是利用“火山和大气变化观测网络”综合数据库的光谱数据改进对火山BrO和SO2的评估，该数据库目前包括24座火山的60多台仪器，目标如下：1.改进SO2和BrO的光谱评估，应用简化的辐射传输校正，并使用大量统计数据来改进SO2通量、BrO/SO2比率以及火山BrO和SO2向大气中的全球大气排放。分析SO2-通量、BrO/SO2-比值与火山过程的相关性，从而为改进火山爆发预测奠定基础。NOVAC网络提供的大量数据使得能够进行时间序列分析，并与当地观测站（哥伦比亚和厄瓜多尔）密切合作，将脱气数据的时间序列与其他数据集（例如地震和变形以及气象学）相关联，并查明不同时间序列之间的联系。

Composition and total gas fluxes emitted by volcanoes provide indications for processes in the interior of volcanoes. Changes in emitted gas fluxes can be an additional (besides, e.g. seismic, deformation) tool for forecasting eruptions. Beyond the total amount of gas released also the relative abundance of different gases can be indicative of certain types of volcanic activity. This proposal is centered on the improved evaluation of volcanic BrO and SO2 using spectroscopic data from the comprehensive database of the "Network for Observation of Volcanic and Atmospheric Change", which at present encompasses more than 60 instruments at 24 volcanoes, with the following objectives: 1. Improved spectroscopic evaluation of SO2 and BrO, application of simplified radiative transfer corrections, and use of the large statistics for improved determination of SO2-fluxes, BrO/SO2-ratios, and the global atmospheric emission of volcanic BrO and SO2 into the atmosphere.2. Analysis of SO2-fluxes, BrO/SO2-ratios with respect to their correlation with volcanic processes and thus laying the foundation for improved predictions of volcanic eruptions. The large amount of data available from the NOVAC network allows to perform time series analyses and - in close collaboration with local observatories (Colombia and Equador) - to correlate the time series of degassing data with other data sets (e.g. seismic and deformation as well as meteorology), and to identify links between the different time series.