Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 2 2008 10.5194/acpd-8-8119-2008 http://www.atmos-chem-phys-discuss.net/8/8119/2008/ http://www.atmos-chem-phys-discuss.net/8/8119/2008/acpd-8-8119-2008.html http://www.atmos-chem-phys-discuss.net/8/8119/2008/acpd-8-8119-2008.pdf 8119 8141 2008-04-23 SO₂ emissions from Popocatépetl volcano: emission rates and plume imaging using optical remote sensing techniques M. Grutter grutter@servidor.unam.mx R. Basaldud C. Rivera R. Harig W. Junkerman E. Caetano H. Delgado-Granados Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico Department of Radio and Space Science, Chalmers University of Technology, Sweden Technische Universität Hamburg-Harburg, Germany Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico Sulfur dioxide emissions from Popocatépetl volcano in central Mexico were measured during the MILAGRO field campaign in March 2006. A stationary scanning DOAS (Differential Optical Absorption Spectrometer) was used to monitor the SO₂ emissions from the volcano and the results were compared with traverses done with a COSPEC from the ground and a DOAS instrument on board an ultra-light aircraft. Daytime evolutions as well as day-to-day variation of the SO₂ emissions are reported. A value of 2.45±1.39 Gg/day of SO₂ is reported from all the daily averages obtained during the month of March 2006, with large variation in maximum and minimum daily averages of 5.97 and 0.56 Gg/day, respectively. The large short-term fluctuations in the SO₂ emissions obtained could be confirmed through 2-D visualizations of the SO₂ plume measured with a scanning imaging infrared spectrometer. This instrument, based on the passive detection of thermal radiation from the volcanic gas and analysis with FTIR spectrometry, is used for the first time for plume visualization of a specific volcanic gas. 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