Ratiocalc: Software for processing data from multicomponent volcanic gas analyzers

Tamburello, Giancarlo

doi:10.1016/j.cageo.2015.05.004

Cited by 70 publications

(79 citation statements)

References 13 publications

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“…The acquired concentration data (from both fixed and portable Multi-GaS instruments) were processed using custom-made Ratiocalc software (Tamburello 2013), which automatically runs the retrieval methodology described in aiuppa et al (2005,2006,2009). air-background-corrected concentrations were first calculated by subtracting ambient air concentrations of ~25,000 ppmv for H 2 O and ~390 ppmv CO 2 from the raw data.…”

Section: Multi-gas Measurementmentioning

confidence: 99%

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Conde

Robidoux

Avard³

et al. 2014

Int J Earth Sci (Geol Rundsch)

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crateric SO 2 emissions, and electrochemical/nDIR multicomponent gas analyser system (multi-GaS) instruments for measuring CO 2 /SO 2 ratios of excerpts of the volcanic plume. This study aims to quantify the representativeness of excerpts of CO 2 /SO 2 ratios measured by Multi-GaS as a fraction of the whole plume composition, by comparison with simultaneously measured CO 2 /SO 2 ratios using crosscrater Fourier transform infrared spectroscopy (FTIR). Two study cases are presented: Telica volcano (nicaragua), with a homogenous plume, quiescent degassing from a deep source and ambient temperature, and Turrialba volcano (Costa Rica), which has a non-homogeneous plume from three main sources with different compositions and temperatures. Our comparison shows that in our "easier case" (Telica), FTIR and Multi-GaS CO 2 /SO 2 ratios agree within a factor about 3 %. In our "complicated case" (Turrialba), Multi-GaS and FTIR yield CO 2 /SO 2 ratios differing by approximately 13-25 % at most. These results suggest that a fair estimation of volcanic CO 2 emissions can be provided by the combination of DOaS and Multi-GaS instruments for volcanoes with similar degassing conditions as Telica or Turrialba. Based on the results of this comparison, we report that by the time our measurements were made, Telica and Turrialba were emitting approximately 100 and 1,000 t day −1 of CO 2 , respectively.

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Section: Multi-gas Measurementmentioning

confidence: 99%

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Conde

Robidoux

Avard³

et al. 2014

Int J Earth Sci (Geol Rundsch)

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“…The so‐obtained background air H 2 O content was subtracted from H 2 O readings to obtain volcanic H 2 O. No H 2 S was detected above the 13% cross‐sensitivity of the H 2 S sensor to SO 2 [ Tamburello , ].…”

Section: Methodsmentioning

confidence: 99%

“…We postprocess the acquired CO 2 and SO 2 concentration data using the Ratiocalc software [ Tamburello , ] to obtain time‐averaged CO 2 /SO 2 ratios calculated over 30 min long Multi‐GAS acquisition windows. The obtained results are listed in Table .…”

Section: Methodsmentioning

confidence: 99%

A CO₂‐gas precursor to the March 2015 Villarrica volcano eruption

Aiuppa

Bitetto

Francofonte

et al. 2017

Geochem Geophys Geosyst

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We present here the first volcanic gas compositional time‐series taken prior to a paroxysmal eruption of Villarrica volcano (Chile). Our gas plume observations were obtained using a fully autonomous Multi‐component Gas Analyser System (Multi‐GAS) in the 3 month‐long phase of escalating volcanic activity that culminated into the 3 March 2015 paroxysm, the largest since 1985. Our results demonstrate a temporal evolution of volcanic plume composition, from low CO2/SO2 ratios (0.65‐2.7) during November 2014‐January 2015 to CO2/SO2 ratios up to ≈ 9 then after. The H2O/CO2 ratio simultaneously declined to <38 in the same temporal interval. We use results of volatile saturation models to demonstrate that this evolution toward CO2‐enriched gas was likely caused by unusual supply of deeply sourced gas bubbles. We propose that separate ascent of over‐pressured gas bubbles, originating from at least 20‐35 MPa pressures, was the driver for activity escalation toward the 3 March climax.

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“…Aiuppa et al 2011, 2015, Moussallam et al 2012. All sensors were calibrated in the laboratory at INGV Palermo (October 2015), with target gases of known concentration.…”

Section: Methodsmentioning

confidence: 99%

“…Multi-GAS measurements were taken on 1 December 2015 for 90 min. Post processing was performed using the Ratiocalc software (Tamburello, 2015).…”

Section: Methodsmentioning

confidence: 99%

Magmatic gas percolation through the old lava dome of El Misti volcano

et al. 2017

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The proximity of the major city of Arequipa to El Misti has focused attention on the hazards posed by the active volcano. Since its last major eruption in the fifteenth century, El Misti has experienced a series of modest phreatic eruptions and fluctuating fumarolic activity. Here, we present the first measurements of the compositions of gas emitted from the lava dome in the summit crater. The gas composition is found to be fairly dry with a H 2 O/SO 2 molar ratio of 32 ± 3, a CO 2 / SO 2 molar ratio of 2.7 ± 0.2, a H 2 S/SO 2 molar ratio of 0.23 ± 0.02 and a H 2 /SO 2 molar ratio of 0.012 ± 0.002. This magmatic gas signature with minimal evidence of hydrothermal or wall rock interaction points to a shallow magma source that is efficiently outgassing through a permeable conduit and lava dome. Field and satellite observations show no evolution of the lava dome over the last decade, indicating sustained outgassing through an established fracture network. This stability could be disrupted if dome permeability were to be reduced by annealing or occlusion of outgassing pathways. Continued monitoring of gas composition and flux at El Misti will be essential to determine the evolution of hazard potential at this dangerous volcano.

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Ratiocalc: Software for processing data from multicomponent volcanic gas analyzers

Cited by 70 publications

References 13 publications

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

A CO₂‐gas precursor to the March 2015 Villarrica volcano eruption

Magmatic gas percolation through the old lava dome of El Misti volcano

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Ratiocalc: Software for processing data from multicomponent volcanic gas analyzers

Cited by 70 publications

References 13 publications

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

A CO2‐gas precursor to the March 2015 Villarrica volcano eruption

Magmatic gas percolation through the old lava dome of El Misti volcano

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Resources

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A CO₂‐gas precursor to the March 2015 Villarrica volcano eruption