HR: 1340h
AN: V33C-1477    [Abstracts]
TI: Space-based TIR Detection of Volcanic SO$_{2}$ in the North Pacific using ASTER and MODIS
AU: * Kearney, C
EM: ckearney@gi.alaska.edi
AF: Alaska Volcano Observatory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Dehn, J
EM: jdehn@gi.alaska.edu
AF: Alaska Volcano Observatory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Dean, K
EM: ken.dean@gi.alaska.edi
AF: Alaska Volcano Observatory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AB: This study focuses on the detection of volcanic SO$_{2}$ in the North Pacific region (NOPAC) which contains over 150 active volcanoes. Ground based UV detection techniques have long been the standard in monitoring total volcanic SO$_{2}$ flux, with satellite sensors used solely during eruptive episodes. Increases in the spectral and spatial resolution of TIR satellite sensors since the launch of NASA's Terra (1999) and Aqua (2002) platforms has provided researchers with a heightened perspective of emitted SO$_{2}$ at active volcanoes and may allow for SO$_{2}$ monitoring in remote volcanic regions. Using the 8.6 μm absorption feature of SO$_{2}$, estimates at select NOPAC volcanoes during both passive degassing and eruptive episodes are determined. On 10 May 2004 at 0840 UTC ASTER detected approximately 380 kt of SO$_{2}$ at Shishaldin (Alaska, USA), which agrees with preliminary field measurements from July 2004. The detection of the eruption of Bezymianny (Kamchatka, Russia) in January 2004 by consecutive Terra and Aqua provided a time series of MODIS data. Analysis of this data set indicates approximately 40 kt of SO$_{2}$ was detected by 0210 UTC on 14 January 2004. These results indicate the versatility and value of this detection technique in the remote NOPAC region.
DE: 8419 Eruption monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting