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Authors: Corradini, S.*
Tirelli, C.*
Gangale, G.*
Pugnaghi, Sergio*
Carboni, E.*
Title: Theoretical study on SO2 and ash volcanic plume retrievals using ground TIR camera. Sensitivity analysis and retrieval procedure developments
Title of journal: IEEE Transactions on Geoscience and Remote Sensing
Series/Report no.: 3/48 (2010)
Publisher: IEEE Geoscience and Remote Sensing Society
Issue Date: Mar-2010
DOI: 10.1109/TGRS.2009.2032242
Keywords: Remote sensing
ground measurements
sulphur dioxide
volcanic ash
Mt. Etna Mt. Etna volcano
Abstract: In this paper, a sensitivity analysis and procedure development for volcanic-plume sulfur dioxide and ash retrievals using ground thermal infrared camera have been carried out. The semiconductor device camera, considered as a reference, has a spectral range of 8–14 μm with noise equivalent temperature difference that is better than 100 mK at 300 K. The camera will be used to monitor and assess the hazards of Mt. Etna volcano to mitigate the risk and impact of volcanic eruptions on the civil society and transports. A minimum number of filters have been selected for sulfur dioxide (SO2) and volcanic ash retrievals. The sensitivity study has been carried out to determine the SO2 and volcanic ash minimum concentration detectable by the system varying the camera geometry and the atmospheric profiles. Results show a meaningful sensitivity increase considering high instrument altitudes and low camera-elevation angles. For all geometry configurations and monthly profiles, the sensitivity limit varies between 0.5 and 2 g · m−2 for SO2 columnar abundance and between 0.02 and 1 for ash optical depth. Two procedures to detect SO2 and ash, based on the least square fit method and on the brightness temperature difference (BTD) algorithm, respectively, have also been proposed. Results show that high concentration of atmospheric water vapor columnar content significantly reduces the ash-plume effect on the BTD. A water vapor-correction procedure introduced improves the ash retrievals and the cloud discrimination in every season, considering all the camera geometries.
Appears in Collections:04.08.07. Instruments and techniques
05.02.03. Volcanic eruptions
04.08.01. Gases
04.08.08. Volcanic risk
04.08.06. Volcano monitoring
Papers Published / Papers in press

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