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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Daily monitoring of Ecuadorian volcanic degassing from space
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Daily monitoring of Ecuadorian volcanic degassing from space

机译：每日监测厄瓜多尔太空火山脱气

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We present daily measurements of sulfur dioxide (SO_2) emissions from active volcanoes in Ecuador and southern Colombia between September 2004 and September 2006, derived from the Ozone Monitoring Instrument (OMI) on NASA's EOS/Aura satellite. OMI is an ultraviolet/visible spectrometer with an unprecedented combination of spatial and spectral resolution, and global coverage, that permits daily measurements of passive volcanic degassing from space. We use non-interactive processing methods to automatically extract daily SO_2 burdens and information on SO_2 sources from the OMI datastream. Maps of monthly average SO_2 vertical columns retrieved by OMI over Ecuador and S. Colombia are also used to illustrate variations in regional SO_2 loading and to pinpoint sources. The dense concentration of active volcanoes in Ecuador provides a stringent test of OMI's ability to distinguish SO_2 from multiple emitting sources. Our analysis reveals that Tungurahua, Reventador and Galeras were responsible for the bulk of the SO_2 emissions in the region in the timeframe of our study, with no significant SO_2 discharge detected from Sangay. At Galeras and Reventador, we conclude that OMI can detect variations in SO_2 release related to cycles of conduit sealing and degassing, which are a critical factor in hazard assessment. The OMI SO_2 data for Reventador are the most extensive sequence of degassing measurements available for this remote volcano, which dominated regional SO_2 production in June-August 2005. At Tungurahua, the OMI measurements span the waning stage of one eruptive cycle and the beginning of another, and we observe increasing SO_2 burdens in the months prior to explosive eruptions of the volcano in July and August 2006. Cumulative SO_2 loadings measured by OMI yield a total of ～1.16 Tg SO_2 emitted by volcanoes on mainland Ecuador/S. Colombia between September 2004 and September 2006; as much as 95% of this SO_2 may originate from non-eruptive degassing. Approximate apportionment of the total SO_2 loading indicates that ～40% originated from Tungurahua, with ～30% supplied by both Reventador and Galeras. These measurements of volcanic SO_2 degassing in Ecuador confirm OMI's potential as an effective, economical and risk-free tool for daily monitoring of SO_2 emissions from hazardous volcanoes.
机译：我们提供了2004年9月至2006年9月之间厄瓜多尔和哥伦比亚南部活跃火山的二氧化硫（SO_2）排放量的每日测量数据，这些数据来自于NASA EOS / Aura卫星上的臭氧监测仪（OMI）。 OMI是一种紫外/可见光谱仪，具有空间和光谱分辨率以及全球覆盖范围的空前组合，可以每天进行被动火山脱气的测量。我们使用非交互式处理方法从OMI数据流中自动提取每日SO_2负担和有关SO_2源的信息。 OMI通过厄瓜多尔和南哥伦比亚获得的每月平均SO_2垂直列的地图也用于说明区域SO_2负荷的变化并查明来源。厄瓜多尔密集的活火山浓度为OMI区分SO_2与多种排放源的能力提供了严格的检验。我们的分析表明，在我们研究的时间范围内，通古拉瓦，雷文多多和加莱拉斯是该地区大部分SO_2排放的原因，而桑盖地区未检测到大量的SO_2排放。在Galeras和Reventador，我们得出的结论是，OMI可以检测与导管密封和脱气循环有关的SO_2释放变化，这是危害评估中的关键因素。 Reventador的OMI SO_2数据是可用于该偏远火山的最广泛的脱气测量序列，该序列主导了2005年6月至8月区域SO_2的生产。在通古拉瓦（Tungurahua），OMI测量跨越了一个喷发周期的减弱阶段和另一个喷发周期的开始。 ，我们观察到在2006年7月和2006年8月火山爆发之前的几个月中，SO_2的负荷在增加。用OMI测算的累积SO_2负荷在厄瓜多尔/ S大陆上的火山排放总量约为〜1.16 Tg SO_2。 2004年9月至2006年9月之间的哥伦比亚；高达95％的SO_2可能来自非火山喷发脱气。总SO_2含量的近似分配表明，约40％的源于通古拉瓦，约30％的源来自Reventador和Galeras。对厄瓜多尔火山SO_2脱气的这些测量结果证实了OMI作为日常监测危险火山中SO_2排放的有效，经济和无风险工具的潜力。

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