A multi-statistical approach for estimating the total output of CO 2 from diffuse soil degassing by the accumulation chamber method

Elío, Javier; Ortega, Marcelo F.; Nisi, Bárbara; Mazadiego, Luis Felipe; Vaselli, Orlando; Caballero, Juan; Chacón, E.

doi:10.1016/j.ijggc.2016.02.012

Cited by 21 publications

(20 citation statements)

References 35 publications

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“…In order to identify anomalies in time series, soil CO 2 flux populations were characterized using both the Sinclair graphical approach [ Sinclair , ] and the maximum‐likelihood method [ Elio et al , ]. Both methods produce similar results (Table S4).…”

Section: Resultsmentioning

confidence: 99%

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)

Boudoire

Muro

Liuzzo

et al. 2017

Geophysical Research Letters

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Detecting renewal of volcanic activity is a challenging task and even more difficult in tropical settings. Continuous measurements of soil CO2 flux were carried out at the Piton de la Fournaise volcano during 2013–2016. Since this site is in the tropics, periods of heavy rainfall are in the norm. Measurements covered volcanic unrest after a hiatus of 3.5 years. We find that while temperature has the strongest effect, extreme rainfall causes short‐term noise. When corrected and filtered from the environmental influence, soil CO2 time series permit to detect a major deep magmatic event during March–April 2014, 3 months before the first eruption of the new activity phase. Correlation with geophysical data sets allows timing of further stages of upward fluid ascent. Our study validates soil CO2 flux monitoring in tropical environments as a valuable tool to monitor magma transfer and to enhance understanding of volcano unrest down to the lithospheric mantle.

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Section: Resultsmentioning

confidence: 99%

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)

Boudoire

Muro

Liuzzo

et al. 2017

Geophysical Research Letters

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“…Statistical analyses of the data distribution were performed using the graphical approach based on Sinclair's cumulative probability plots (MATLAB code; Sinclair, 1974). Thresholds were determined using the maximum-likelihood method based on a Gaussian Mixture Model (GMM) implementing an expectation-maximization (EM) algorithm developed on "Python" programming language, which is more accurate for short datasets ( b 100 values; Elio et al, 2016). Isotopic analysis on gas samples collected in vials through a capillary probe into the soil (at 50 cm-depth) was performed at INGV Palermo (Italy), with a Thermo Delta Plus XP CF-IRMS (precision ±0.15 δ‰) coupled with a Thermo TRACE Gas Chromatograph (GC) and a Thermo GC/C III interface .…”

Section: Methodsmentioning

confidence: 99%

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Boudoire

Liuzzo

Muro

et al. 2017

Journal of Volcanology and Geothermal Research

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Peripheral diffuse degassing of CO 2 from the soil occurs across the western flank of Piton de la Fournaise volcano (La Réunion Island, Indian Ocean) along a narrow zone. In this area, carbon isotopic analysis on soil gas samples highlights significant mixing between magmatic and organic end-members. The zones with the strongest magmatic signature (highest δ 13 C) overlap spatial distribution of hypocenters recorded shortly before and during volcano reactivation and allow discriminating a N135° degassing lineament, with a minimum length of 11 km and 140 ± 20 m-width. Such orientation is in accordance with that of an old dyke network along the rift zone and with N120-130° and N140-155° lineaments related to the inheritance of oceanic lithosphere structures. Our findings show that this N135° lineament represents a preferential magmatic pathway for deep magma transfer below the volcano flank. Moreover, spatial distributions of recent eccentric cones indicate a well-founded possibility that future eruptions may by-pass the shallow plumbing system of the central area of the volcano, taking a lateral pathway along this structure. Our results also confirm that Piton de la Fournaise activity is linked to a laterally shifted plumbing system and represent a major improvement in identifying the main high-risk area on the densely populated western flank of the volcano.

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“…The use of chambers to represent soil-gas fluxes at field-scale is often highly time-intensive and prone to interpolation-related uncertainty (Elío et al, 2016), particularly for sites with heterogeneous soils or geology. Micrometeorological methods can also be difficult to implement at the field-scale as they are reliant on wind direction and non-turbulent atmospheric conditions between the ground-surface and the sensors.…”

Section: Introductionmentioning

confidence: 99%

Using near-surface atmospheric measurements as a proxy for quantifying field-scale soil gas flux

Barkwith¹,

Beaubien²,

Barlow³

et al. 2020

Preprint

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Abstract. We present a new method for deriving surface soil gas flux at the field scale, which is less field-work intensive than traditional chamber techniques and less expensive than those derived from airborne or space surveys. The technique uses aspects of chamber and micrometeorological methods combined with a mobile platform and GPS to rapidly derive soil gas fluxes at the field-scale. There are several assumptions in using this method, which will be most accurate under stable atmospheric conditions with little horizontal wind flow. Results show that soil gas fluxes, when averaged across a field site, are highly comparable between the method presented and traditional chamber acquisition techniques. Atmospheric dilution is found to reduce the range of flux values under the open field-scale method, when compared to chamber derived results. Under ideal atmospheric conditions it may be possible to use the presented method to derive soil gas flux at an individual point, however this requires further investigation. The new method for deriving soil-atmosphere gas exchange at the field-scale could be useful for a number of applications including quantification of CCS leakage, diffuse degassing in volcanic and geothermal areas and greenhouse-gas emissions.

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A multi-statistical approach for estimating the total output of CO 2 from diffuse soil degassing by the accumulation chamber method

Cited by 21 publications

References 35 publications

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Using near-surface atmospheric measurements as a proxy for quantifying field-scale soil gas flux

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A multi-statistical approach for estimating the total output of CO 2 from diffuse soil degassing by the accumulation chamber method

Cited by 21 publications

References 35 publications

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO2 flux at Piton de la Fournaise (La Réunion Island, France)

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO2 flux at Piton de la Fournaise (La Réunion Island, France)

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Using near-surface atmospheric measurements as a proxy for quantifying field-scale soil gas flux

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Product

Resources

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New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)

New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO₂ flux at Piton de la Fournaise (La Réunion Island, France)