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首页> 美国卫生研究院文献>Geochemical Transactions >Continuous in situ measurements of volcanic gases with a diode-laser-based spectrometer: CO2 and H2O concentration and soil degassing at Vulcano (Aeolian islands: Italy)
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Continuous in situ measurements of volcanic gases with a diode-laser-based spectrometer: CO2 and H2O concentration and soil degassing at Vulcano (Aeolian islands: Italy)

机译：使用基于二极管激光的光谱仪连续原位测量火山气：Vulcano（风神群岛：意大利）的CO2和H2O浓度以及土壤脱气

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We report on a continuous-measurement campaign carried out in Vulcano (Aeolian islands, Sicily), devoted to the simultaneous monitoring of CO2 and H2O concentrations. The measurements were performed with an absorption spectrometer based on a semiconductor laser source emitting around a 2-μm wavelength. The emitted radiation was selectively absorbed by two molecular ro-vibrational transitions specific of the investigated species. Data for CO2 and H2O concentrations, and CO2 soil diffusive flux using an accumulation chamber configuration, were collected at several interesting sampling points on the island (Porto Levante beach- PLB, Fossa Grande Crater – FOG- and Valley of Palizzi, PAL). CO2/H2O values, measured on the ground, are very similar (around 0.019 (± 0.006)) and comparable to the previous discrete detected values of 0.213 (Fumarole F5-La Fossa crater rim) and 0.012 (Fumarole VFS – Baia Levante beach) obtaid during the 1977–1993 heating phase of the crater fumaroles.In this work much more homogeneous values are found in different points of the three sites investigated. The field work, although carried out in a limited time window (25th–28th August 2004), pointed out the new apparatus is suitable for continuous gas monitoring of the two species and their ratios, which are important geochemical indicators of volcanic activity, for which other reliable continuous monitoring systems are not yet available.
机译：我们报告了在Vulcano（西西里岛的风神群岛）进行的一项连续测量运动，该运动致力于同时监测CO2和H2O的浓度。使用基于发射约2μm波长的半导体激光源的吸收光谱仪进行测量。所发射的辐射被特定于所研究物种的两个分子旋转振动跃迁选择性吸收。在岛上的几个有趣的采样点（波尔图莱万特海滩-PLB，福萨大火山口-FOG-和帕利齐谷，PAL）收集了使用累积室配置的CO2和H2O浓度以及CO2土壤扩散通量的数据。在地面上测得的CO2 / H2O值非常相似（约0.019（±0.006）），与之前的离散检测值0.213（Fumarole F5-La Fossa火山口边缘）和0.012（Fumarole VFS – Baia Levante海滩）相当在1977年至1993年火山口喷气孔的加热阶段中观测到。在这项工作中，在所研究的三个地点的不同点发现了更均一的值。现场工作虽然在有限的时间范围内（2004年8月25日至28日）进行，但指出该新设备适用于连续监测两个物种及其比例的气体，这是火山活动的重要地球化学指标，为此，其他可靠的连续监视系统尚不可用。

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