Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/12300
Authors: Hasselle, Nathalie* 
Rouwet, Dmitri* 
Aiuppa, Alessandro* 
Jacome Paz, M. P.* 
Pfeffer, Melissa* 
Taran, Y.* 
Campion, R.* 
Bitetto, M.* 
Giudice, Gaetano* 
Bergsson, B.* 
Title: Sulfur Degassing From Steam-Heated Crater Lakes: El Chichón (Chiapas, Mexico) and Víti (Iceland)
Journal: Geophysical Research Letters 
Series/Report no.: /45 (2018)
Issue Date: 2018
DOI: 10.1029/2018GL079012
Abstract: 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.
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