SO 2 emissions during the 2021 eruption of La Soufrière St. Vincent, revealed with back-trajectory analysis of TROPOMI imagery
SO
2
emissions during the 2021 eruption of La Soufrière St. Vincent, revealed with back-trajectory analysis of TROPOMI imagery
复制标题
通过 TROPOMI 图像的后向轨迹分析揭示了 2021 年圣文森特拉苏弗里耶尔喷发期间的 SO 2 排放
DOI：
10.1144/sp539-2022-77
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
C. Johnson
中科院分区：
文献类型：
--
作者：
B. Esse;M. Burton;C. Hayer;R. Contreras;T. Christopher;E. Joseph;M. Varnam;C. Johnson
确定SO
2
来自爆发性喷发的排放时间序列可以提供对驱动岩浆过程的重要见解，然而，很难收集精确的测量数据。
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然而，将其转换为揭示火山过程所需的高度和时间分辨的排放历史是一个重大挑战。这意味着，
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排放时间序列很少被量化为重大喷发，这使我们对爆炸性火山作用的理解出现了空白。
在这里，我们结合联合收割机，
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对流层监测仪器（TROPOMI）使用PlumeTraj（一种后向轨迹分析工具包）收集的图像，用于重建SO
2
2021年4月圣文森特苏弗里埃尔火山爆发之前和期间的排放。前兆SO
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在火山爆发前一天对排放量进行了量化，排放率与地面测量结果一致。我们通过比较测得的SO，
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排放量与喷发的岩浆量，发现最初的爆炸是硫贫（730 ppm S）相比，主要喷发阶段（高达3400 ppm S）。这表明最初的爆炸清除了居住在浅层管道系统中的旧的、先前脱气的岩浆，随后是主要的、大部分未脱气的岩浆源的喷发。
补充材料
https://doi.org/10.6084/m9.figshare.c.6474314
Determining SO
2
emission time series from explosive eruptions can provide important insights into the driving magmatic processes, however accurate measurements are difficult to collect. Satellite-based platforms provide SO
2
imagery, however translating this to the altitude- and time-resolved emission history required to unravel volcanic processes is a major challenge. This means SO
2
emission time series are rarely quantified for major eruptions, producing a gap in our understanding of explosive volcanism.
Here, we combine SO
2
imagery collected by the TROPOspheric Monitoring Instrument (TROPOMI) with PlumeTraj, a back-trajectory analysis toolkit, to reconstruct the SO
2
emission prior to, and during, the explosive eruption of La Soufrière volcano, St. Vincent, in April 2021. Precursory SO
2
emissions were quantified the day before the eruption, with emission rates in agreement with ground-based measurements. We estimate initial magma sulphur contents by comparing the measured SO
2
emissions with erupted magma volumes, finding that the initial explosion was sulphur poor (730 ppm S) compared to the main eruption phase (up to 3400 ppm S). This suggests that the initial explosion cleared old, previously degassed magma resident in the shallow plumbing system, followed by the eruption of the main, mostly un-degassed magma source.
Supplementary material at
https://doi.org/10.6084/m9.figshare.c.6474314