Sulfur Degassing From Steam-Heated Crater Lakes: El Chichón (Chiapas, Mexico) and Víti (Iceland)
Por:
Hasselle, N., Rouwet, D., Aiuppa, A., Jacome-Paz, M. P., Pfeffer, M., Taran, Y., Campion, R., Bitetto, M., Giudice, G., Bergsson, B.
Publicada:
16 ago 2018
Resumen:
The composition of the gases released by El Chichón (Chiapas, Mexico) and Víti (Askja volcano, Iceland) volcanic lakes is examined by Multi-GAS for the first time. Our results demonstrate that H2S and SO2 are degassed by these pH 2–3 lakes. We find higher CO2/H2S and H2/H2S ratios in the lakes' emissions (31–5,685 and 0.6–35, respectively) than in the fumarolic gases feeding the lakes (13–33 and 0.08–0.5, respectively), evidencing that only a fraction (0.2–5.4% at El Chichón) of the H2S(g) contributed by the subaquatic fumaroles ultimately reaches the atmosphere. At El Chichón, we estimate a H2S output from the crater lake of 0.02–0.06 t/day. Curiously, SO2 is also detected at trace levels in the gases released from both lakes (0.003–0.3 ppmv). We propose that H2S supplied into the lakes initiates a series of complex oxidation reactions, having sulfite as an intermediate product, and ultimately leading to SO2 production and degassing. ©2018. American Geophysical Union. All Rights Reserved.
Filiaciones:
Hasselle, N.:
Dipartimento DiSTeM, Università di Palermo, Palermo, Italy
Univ Palermo, Dipartimento DiSTeM, Palermo, Italy
Rouwet, D.:
Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy
Ist Nazl Geofis & Vulcanol, Bologna, Italy
Aiuppa, A.:
Dipartimento DiSTeM, Università di Palermo, Palermo, Italy
Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy
Univ Palermo, Dipartimento DiSTeM, Palermo, Italy
Ist Nazl Geofis & Vulcanol, Palermo, Italy
Jacome-Paz, M. P.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico
Pfeffer, M.:
Icelandic Meteorological Office, Reykjavik, Iceland
Icelandic Meteorol Off, Reykjavik, Iceland
Taran, Y.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico
Campion, R.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico
Bitetto, M.:
Dipartimento DiSTeM, Università di Palermo, Palermo, Italy
Univ Palermo, Dipartimento DiSTeM, Palermo, Italy
Giudice, G.:
Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy
Ist Nazl Geofis & Vulcanol, Palermo, Italy
Bergsson, B.:
Icelandic Meteorological Office, Reykjavik, Iceland
Icelandic Meteorol Off, Reykjavik, Iceland
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