Dieses Dokument steht unter einer CreativeCommons Lizenz by/3.0
Verlagslink DOI: 10.5194/amt-5-275-2012
Titel: Volcanic SO2 and SiF4 visualization using 2-D thermal emission spectroscopy ; Part 1: Slant-columns and their ratios
Sprache: English
Autor/Autorin: Stremme, Wolfgang 
Krueger, Arne 
Harig, Roland 
Grutter, Michel 
Schlagwörter: thermal emission spectroscopy
Erscheinungsdatum: 2-Feb-2012
Verlag: European Geosciences Union, Copernicus
Quellenangabe: Atmospheric Measurement Techniques 2 (5): 275-288 (2012)
Zeitschrift oder Schriftenreihe: Atmospheric measurement techniques 
Zusammenfassung (englisch): The composition and emission rates of volcanic gas plumes provide insight of the geologic internal activity, atmospheric chemistry, aerosol formation and radiative processes around it. Observations are necessary for public security and the aviation industry. Ground-based thermal emission infrared spectroscopy, which uses the radiation of the volcanic gas itself, allows for continuously monitoring during day and night from a safe distance. We present measurements on Popocatépetl volcano based on thermal emission spectroscopy during different campaigns between 2006-2009 using a Scanning Infrared Gas Imaging System (SIGIS). The experimental set-up, measurement geometries and analytical algorithms are described. The equipment was operated from a safe distance of 12 km from the volcano at two different spectral resolutions: 0.5 and 4 cm−1. The 2-dimensional scanning capability of the instrument allows for an on-line visualization of the volcanic SO2 plume and its animation. SiF4 was also identified in the infrared spectra recorded at both resolutions. The SiF4/SO2 molecular ratio can be calculated from each image and used as a highly useful parameter to follow changes in volcanic activity. A small Vulcanian eruption was monitored during the night of 16 to 17 November 2008 and strong ash emission together with a pronounced SO2 cloud was registered around 01:00 a.m. LST (Local Standard Time). Enhanced SiF4/SO2 ratios were observed before and after the eruption. A validation of the results from thermal emission measurements with those from absorption spectra of the moon taken at the same time, as well as an error analysis, are presented. The inferred propagation speed from sequential images is used in a subsequent paper (Part 2) to calculate the emission rates at different distances from the crater.
URI: http://tubdok.tub.tuhh.de/handle/11420/1936
DOI: 10.15480/882.1933
ISSN: 1867-8548
Institut: Elektrische Energietechnik E-6 
Dokumenttyp: (wissenschaftlicher) Artikel
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