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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. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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Hasselle Chichon Viti GRL 2018.pdf | paper | 1.11 MB | Adobe PDF | View/Open |
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