First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles)
We used a Multi-component Gas Analyser System (Multi-GAS) to measure, for the very first time, the composition (H2O, CO2, H2S, SO2) of the volcanic gas plume issuing from the Boiling Lake, a vigorously degassing, hot (T ~ 80-90°C) volcanic lake in Dominica, West Indies. The Multi-GAS captured in-plu...
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doaj-f4dc05c4486a4b3fb9d13a0ed7ac88872020-11-24T22:15:04ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2014-01-0156510.4401/ag-62775889First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles)Rossella Di Napoli0Alessandro Aiuppa1Patrick Allard2Università degli Studi di Palermo, Dipartimento di Scienze della Terra e del Mare (DiSTeM), PalermoUniversità degli Studi di Palermo, Dipartimento di Scienze della Terra e del Mare (DiSTeM), Palermo, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di PalermoInstitut de Physique du Globe de Paris (IPGP), ParisWe used a Multi-component Gas Analyser System (Multi-GAS) to measure, for the very first time, the composition (H2O, CO2, H2S, SO2) of the volcanic gas plume issuing from the Boiling Lake, a vigorously degassing, hot (T ~ 80-90°C) volcanic lake in Dominica, West Indies. The Multi-GAS captured in-plume concentrations of H2O, CO2 and H2S were well above those typical of ambient atmosphere, while no volcanic SO2 was detected (<0.05 ppm). These were used to derive the Boiling Lake plume characteristic ratios of CO2/H2S (5.2±0.4) and H2O/CO2 (31.4±6). Assuming that other volcanic gas species (e.g., HCl, CO, H2, N2, etc.) are absent in the plume, we recalculated a (air-free) composition for the sourcing volcanic gases of ~ 96.3% H2O, 3.1% CO2 and 0.6% H2S. This hydrous gas composition is within the range of published gas compositions in the Lesser Antilles region, and slightly more H2O-rich than obtained for the fumaroles of the nearby Valley of Desolation (~94.4% H2O, 4.7% CO2 and 0.8% H2S; CO2/H2S of ~5.7). We use our results, in tandem with the output of numerical simulations of gas scrubbing in the lake-water (performed via the EQ3/6 software), to derive new constraints on the degassing mechanisms at this poorly studied (but potentially hazardous) volcanic lake.http://www.annalsofgeophysics.eu/index.php/annals/article/view/6277Gases, Volcano monitoringInstruments and techniquesVolcanic riskGeochemical data |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rossella Di Napoli Alessandro Aiuppa Patrick Allard |
spellingShingle |
Rossella Di Napoli Alessandro Aiuppa Patrick Allard First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) Annals of Geophysics Gases, Volcano monitoring Instruments and techniques Volcanic risk Geochemical data |
author_facet |
Rossella Di Napoli Alessandro Aiuppa Patrick Allard |
author_sort |
Rossella Di Napoli |
title |
First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) |
title_short |
First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) |
title_full |
First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) |
title_fullStr |
First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) |
title_full_unstemmed |
First Multi-GAS based characterisation of the Boiling Lake volcanic gas (Dominica, Lesser Antilles) |
title_sort |
first multi-gas based characterisation of the boiling lake volcanic gas (dominica, lesser antilles) |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
series |
Annals of Geophysics |
issn |
1593-5213 2037-416X |
publishDate |
2014-01-01 |
description |
We used a Multi-component Gas Analyser System (Multi-GAS) to measure, for the very first time, the composition (H2O, CO2, H2S, SO2) of the volcanic gas plume issuing from the Boiling Lake, a vigorously degassing, hot (T ~ 80-90°C) volcanic lake in Dominica, West Indies. The Multi-GAS captured in-plume concentrations of H2O, CO2 and H2S were well above those typical of ambient atmosphere, while no volcanic SO2 was detected (<0.05 ppm). These were used to derive the Boiling Lake plume characteristic ratios of CO2/H2S (5.2±0.4) and H2O/CO2 (31.4±6). Assuming that other volcanic gas species (e.g., HCl, CO, H2, N2, etc.) are absent in the plume, we recalculated a (air-free) composition for the sourcing volcanic gases of ~ 96.3% H2O, 3.1% CO2 and 0.6% H2S. This hydrous gas composition is within the range of published gas compositions in the Lesser Antilles region, and slightly more H2O-rich than obtained for the fumaroles of the nearby Valley of Desolation (~94.4% H2O, 4.7% CO2 and 0.8% H2S; CO2/H2S of ~5.7). We use our results, in tandem with the output of numerical simulations of gas scrubbing in the lake-water (performed via the EQ3/6 software), to derive new constraints on the degassing mechanisms at this poorly studied (but potentially hazardous) volcanic lake. |
topic |
Gases, Volcano monitoring Instruments and techniques Volcanic risk Geochemical data |
url |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/6277 |
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