HR: 0800h
AN: V41B-0597    [Abstracts]
TI: Halogen Oxide Measurements at Masaya Volcano, Nicaragua
AU: * Kern, C
EM: ckern@iup.uni-heidelberg.de
AF: Institut fuer Umweltphysik, University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany
AU: Vogel, L
EM: lvogel@iup.uni-heidelberg.de
AF: Institut fuer Umweltphysik, University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany
AU: Sihler, H
EM: hsihler@iup.uni-heidelberg.de
AF: Institut fuer Umweltphysik, University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany
AU: Rivera, C
EM: claudia.rivera@rss.chalmers.se
AF: Chalmers University of Technology, Department of Radio and Space Science, Gothenburg, SE-41296, Sweden
AU: Strauch, W
EM: wilfried.strauch@gf.ineter.gob.ni
AF: Instituto Nicaraguense de Estudios Territoriales, Frente a Policlínica Oriental, Managua, 2110, Nicaragua
AU: Galle, B
EM: bo.galle@rss.chalmers.se
AF: Chalmers University of Technology, Department of Radio and Space Science, Gothenburg, SE-41296, Sweden
AU: Platt, U
EM: uplatt@iup.uni-heidelberg.de
AF: Institut fuer Umweltphysik, University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany
AB: Sulphur dioxide (SO₂) and halogen oxide emissions were measured at Masaya Volcano in Nicaragua in April 2007 using differential optical absorption spectroscopy (DOAS). Next to passive DOAS measurements using scattered sunlight, an active long-path DOAS system was operated for several days with the light beam crossing the crater of the volcano. These measurements for the first time give an insight into the night-time halogen chemistry occurring at volcanoes. While the passive DOAS instruments measured sulphur dioxide (SO₂) and bromine monoxide (BrO) in various viewing geometries and distances from the crater during daytime, the active instrument additionally allowed a quantification of chlorine monoxide (ClO) and chlorine dioxide (OClO), as well as being able to measure round-the-clock. The results of the field measurements will be presented and their implications for halogen chemistry at volcanoes will be discussed.
DE: 0322 Constituent sources and sinks
DE: 0370 Volcanic effects (8409)
DE: 8409 Atmospheric effects (0370)
DE: 8430 Volcanic gases
DE: 8485 Remote sensing of volcanoes
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting