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Title: Observations of sulphur dioxide emissions from the Soufriere Hills Volcano, Montserrat, W.I.
Author: Hayer, Catherine S. L.
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2013
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The flux of sulphur dioxide (S02) gas has been used as an indicator of the eruptive activity and reservoir degassing of volcanoes around the globe and specifically during the eruption of Soufriere Hills Volcano on Montserrat, W.I., which has been semi-continuous since 1995. During this study, S02 emission rates measured using ground- and satellite-based instruments were used to evaluate the strengths and weaknesses of two ultraviolet instruments: the satellite-based Ozone Monitoring Instrument (OMI) and a ground-based Differential Optical Absorption Spectrometer (DOAS) instrument array, during two phases of lava extrusion in 2008-2010. An apparent increase in the amount of S02 observed by OMI during lava extrusion compared to quiescence was not observed by the DOAS array. This led to the conclusion that the volcanic S02 plume is located higher in the atmosphere during increased volcanic activity, as a result of a variety of volcanic processes, making it easier to observe from space than from the ground. Measurements from the satellite-based Infrared Atmospheric Sounding Instrument (IASI) show similar trends over temporally-averaged periods to OMI but IASI gives values of S02 emission about 600 tonnes/day lower.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available