HR: 09:00h
AN: V41B-05 INVITED     [Abstracts]
TI: Daily Monitoring of Ecuadorian Volcanic Degassing From Space
AU: * Carn, S A
EM: scarn@umbc.edu
AF: Joint Center for Earth Systems Technology (JCET), University of Maryland Baltimore County, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228, United States
AU: Krueger, A J
EM: akrueger@umbc.edu
AF: Joint Center for Earth Systems Technology (JCET), University of Maryland Baltimore County, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228, United States
AU: Arellano, S
EM: sarellano@igepn.edu.ec
AF: Instituto Geofisico - Escuela Politecnica Nacional, Ladron de Guevara e11-253, Apartado 2759, Quito, Ecuador
AU: Segovia, M
EM: msegovia@igepn.edu.ec
AF: Instituto Geofisico - Escuela Politecnica Nacional, Ladron de Guevara e11-253, Apartado 2759, Quito, Ecuador
AU: Krotkov, N A
EM: krotkov@mhatter.gsfc.nasa.gov
AF: Goddard Earth Sciences and Technology (GEST) Center, University of Maryland Baltimore County, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228, United States
AU: Yang, K
EM: Kai.Yang.1@gsfc.nasa.gov
AF: Goddard Earth Sciences and Technology (GEST) Center, University of Maryland Baltimore County, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228, United States
AB: Daily measurements of volcanic sulfur dioxide (SO₂) emissions in Ecuador and southern Colombia since September 2004, derived from the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite, are presented. We use automated processing to extract daily SO₂ burdens and information on sources from the OMI datastream. Monthly average SO₂ vertical columns are also used to illustrate variations in SO₂ loading and to pinpoint degassing volcanoes. The dense concentration of active volcanoes in the northern Andes provides a test of OMI's ability to distinguish SO₂ from multiple sources. Our analysis reveals that Tungurahua, Reventador and Galeras were responsible for the bulk of regional SO₂ emissions in the timeframe of our study, with no significant SO₂ discharge detected from Sangay. At Galeras and Reventador, we conclude that OMI can detect variations in SO₂ release related to cycles of conduit sealing and degassing, which are a critical factor in hazard assessment. OMI SO₂ data for Reventador are the longest sequence of degassing measurements yet available for this remote volcano. Comparisons between the Reventador SO₂ data and coincident seismic data will be discussed. At Tungurahua, we observe a good qualitative agreement between OMI-derived SO₂ burdens and coincident ground-based SO₂ flux measurements, and note increasing emissions in the months prior to large explosive eruptions of the volcano in July and August 2006. Cumulative SO₂ loadings yield a total of ~1.16 Tg SO₂ emitted by the three source volcanoes between September 2004 and September 2006; predominantly via non-eruptive degassing. These measurements confirm OMI's potential as an effective, economical and risk-free tool for daily monitoring of SO₂ emissions from hazardous volcanoes.
DE: 0370 Volcanic effects (8409)
DE: 8409 Atmospheric effects (0370)
DE: 8419 Volcano monitoring (7280)
DE: 8430 Volcanic gases
DE: 8485 Remote sensing of volcanoes
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly