Remote and in situ plume measurements of acid gas release from La Soufrière volcano, Guadeloupe
| Autor: | Rose-Helen Petit, François Beauducel, Gilbert Hammouya, Jack Molinié, Marie-Lise Bernard, Guy Marion |
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| Přispěvatelé: | Laboratoire de Physique de l'Atmosphère Tropicale (LPAT), Université des Antilles et de la Guyane (UAG), Observatoire Volcanologique et Sismologique de Guadeloupe (OVSG), Institut de Physique du Globe de Paris, Laboratoire de Recherche en Géosciences et Energies (LARGE), Université des Antilles (UA), Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Energétique Electrochimique (LEE), Faculté des Sciences de Paris, Institut de Physique du Globe de Paris (IPG Paris) |
| Rok vydání: | 2006 |
| Předmět: |
010504 meteorology & atmospheric sciences
OP-FTIR Mineralogy SO2 HCl 010502 geochemistry & geophysics 01 natural sciences remote sensing chemistry.chemical_compound Impact crater Geochemistry and Petrology Acid gas [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Panache Chemical composition ComputingMilieux_MISCELLANEOUS Sulfur dioxide 0105 earth and related environmental sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere geography geography.geographical_feature_category La Soufrière of Guadeloupe Plume Geophysics Volcano chemistry 13. Climate action Magma volcanic gas Geology |
| Zdroj: | Journal of Volcanology and Geothermal Research Journal of Volcanology and Geothermal Research, Elsevier, 2006, 150 (4), pp.395-409. ⟨10.1016/j.jvolgeores.2005.08.001⟩ Journal of Volcanology and Geothermal Research, 2006, 150 (4), pp.395-409. ⟨10.1016/j.jvolgeores.2005.08.001⟩ |
| ISSN: | 0377-0273 |
| DOI: | 10.1016/j.jvolgeores.2005.08.001 |
| Popis: | International audience; This paper presents the first remote measurements of La Soufrière gas emissions since the fumarolic and seismic reactivation in 1992. The chemical composition of the plumes has been measured from May 2003 to September 2004 using an Open Path Fourier Transform InfraRed (OP-FTIR) spectrometer, up to 15 m downwind the South Crater. HCl is clearly detected (concentration between 2.4 and 12 ppmv) whereas SO2 and H2S generally remain below the detection limit of the OP-FTIR. Direct measurements of SO2 and H2S near the South Crater with a Lancom III analyzer show a fast decrease of their concentrations with the distance. Calculated Cl / S mass ratios are high: from 9.4 ± 1.7 at 15 m from the vent to 2.8 ± 0.6 at 140 m. The enrichment in HCl of the gas emitted at La Soufrière, observed since 1998, corresponds to the degassing of a magma enriched in Cl and depleted in S. This result agrees with isotopic measurements which suggest a magmatic origin of the gases. Readjustments inside the volcanic system may have taken place during the seismic activity beginning in 1992 and enhance the transfer of magmatic gases to the summit. |
| Databáze: | OpenAIRE |
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